1
|
Breuninger ES, Tolu J, Bouchet S, Winkel LHE. Sensitive analysis of selenium speciation in natural seawater by isotope-dilution and large volume injection using PTV-GC-ICP-MS. Anal Chim Acta 2023; 1279:341833. [PMID: 37827648 DOI: 10.1016/j.aca.2023.341833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 09/14/2023] [Accepted: 09/17/2023] [Indexed: 10/14/2023]
Abstract
Although oceans play a key role in the global selenium (Se) cycle, there is currently very little quantitative information available on the distribution of Se concentrations and Se speciation in marine environments. In general, determining Se concentration and speciation in seawater is highly challenging due to very low Se levels ((sub)ng⋅L-1), whereas matrix elements interfering Se pre-concentration and detection are up to the g⋅L-1 levels. In this study, we established a sensitive method for the determination of the various Se chemical fractions present in natural seawater, i.e. selenite (SeIV), selenate (SeVI), organic Se-II + Se0 and total Se, using species-specific isotope dilution gas chromatography coupled to inductively coupled plasma mass spectrometry (ID-GC-ICP-MS). We compared different derivatization reagents and optimized specific pre-treatment protocols, including a microwave assisted oxidation protocol for the determination of total Se and organic Se-II + Se0 using H2O2. To increase sensitivity, we developed an online pre-concentration method based on large volume injection (LVI) using a programmed temperature vaporization (PTV) inlet. Eventually, the developed method achieved low absolute and methodological detection limits, i.e., respectively, 0.1-0.3 pg and 0.9-3.1 ng.L-1 for the different fractions. The accuracy of our method was of 2% for a certified reference material (CRM) diluted in artificial seawater while the precision was better than 4% for a freshwater CRM in artificial seawater matrix as well as two common seawater CRMs certified for trace elements excluding Se. As a proof-of-concept, we quantified the various Se fractions in a large number of natural water samples from the Baltic and North Seas, encompassing a wide range of salinity (7-35 psu), which shows that its detection limits are sufficient to determine total Se, SeIV, SeVI and organic Se-II + Se0 concentrations in brackish and marine systems.
Collapse
Affiliation(s)
- Esther S Breuninger
- Institute of Biogeochemistry & Pollutant Dynamics, Dept. of Environmental Sciences, Swiss Federal Institute of Technology (ETHZ), Universitätstrasse 16, 8092, Zurich, Switzerland; Department Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science & Technology (Eawag), Überlandstrasse 133, 8600, Dübendorf, Switzerland
| | - Julie Tolu
- Institute of Biogeochemistry & Pollutant Dynamics, Dept. of Environmental Sciences, Swiss Federal Institute of Technology (ETHZ), Universitätstrasse 16, 8092, Zurich, Switzerland; Department Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science & Technology (Eawag), Überlandstrasse 133, 8600, Dübendorf, Switzerland
| | - Sylvain Bouchet
- Institute of Biogeochemistry & Pollutant Dynamics, Dept. of Environmental Sciences, Swiss Federal Institute of Technology (ETHZ), Universitätstrasse 16, 8092, Zurich, Switzerland; Department Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science & Technology (Eawag), Überlandstrasse 133, 8600, Dübendorf, Switzerland.
| | - Lenny H E Winkel
- Institute of Biogeochemistry & Pollutant Dynamics, Dept. of Environmental Sciences, Swiss Federal Institute of Technology (ETHZ), Universitätstrasse 16, 8092, Zurich, Switzerland; Department Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science & Technology (Eawag), Überlandstrasse 133, 8600, Dübendorf, Switzerland.
| |
Collapse
|
2
|
Chromatographic Determination of Total Selenium in Biofortified Allium sp. following Piazselenol Formation and Micro-Solid-Phase Extraction. Molecules 2021; 26:molecules26216730. [PMID: 34771139 PMCID: PMC8588065 DOI: 10.3390/molecules26216730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/03/2021] [Accepted: 11/04/2021] [Indexed: 11/17/2022] Open
Abstract
Herein, a method based on selective piazselenol formation is applied for total selenium determination in biofortified Allium species. Piazselenol is formed by reacting Se(IV) with an aromatic diamine, namely 4-nitro-1,2-phenylenediamine, in acidic medium. Samples were digested in a nitric acid/hydrogen peroxide open system, followed by selenate reduction in hydrochloric acid. Reaction conditions were optimized in terms of pH, temperature, reaction time, and other auxiliary reagents for interference removal, namely, EDTA and hydroxylamine. For the extraction of the selectively formed 4-nitro-piazselenol, micro-solid-phase extraction (μSPE) was applied, and the analysis and detection of the corresponding complex was performed by HPLC coupled with DAD. An external standard calibration curve was developed (R2 = 0.9994) with good sensitivity, and was used to calculate the total selenium content from several Allium plants material, with good intermediate precision (RSD% < 16%). The accuracy of the method was evaluated using both, a comparison with an accepted reference method from our previously published data, as well as three certified reference material with recoveries between 84-126%. The limit of detection was determined to be 0.35 μg/g (in solids) and 1.1 μg/L (in solution), while the limit of quantification was 1.07 μg/g and 3.4 μg/L (in solution). Using the proposed method, selenium content can be quickly and accurately determined in several types of samples. In addition, this study present experimental conditions for overcoming the interferences that might be encountered in selenium determination using piazselenol.
Collapse
|
3
|
Bordash MG, Pagliano E, LeBlanc KL, Kumkrong P, Wallschläger D, Mester Z. Determination of selenocyanate, selenate, and selenite in mining wastewater by GC-MS using sequential derivatization and extraction. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 745:140877. [PMID: 32726700 DOI: 10.1016/j.scitotenv.2020.140877] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/24/2020] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
Selenium speciation analysis is usually carried out using complex hyphenated analytical systems such as LC-ICP-MS. Here we present a novel selenium speciation approach based on a sequential derivatization and extraction combined with gas chromatography mass spectrometry for the simultaneous determination of selenite, selenate, and selenocyanate in aqueous mine wastewater samples. Selenocyanate was derivatized with triethyloxonium tetrafluoroborate to ethylselenocyanate, which was extracted into chloroform, following which the sample was split into two aliquots. One aliquot was acidified and 3,5-bis(trifluoromethyl)-o-phenylenediamine was used for the novel derivatization of selenite to 4,6-bis(trifluoromethyl)-2,1,3-benzoselenadiazole, for the determination of selenite. For the second aliquot, concentrated hydrochloric acid was added along with 4-nitro-o-phenylenediamine to simultaneously reduce selenate to selenite and derivatize the combined "selenite + selenate" fraction to 5-nitro-2,1,3-benzoselenadiazole. The benzoselenadiazoles were extracted with chloroform and all extracts were combined for GC-MS analysis. Low ng g-1 detection limits were reported for all three species. The method is unhindered by concentrations of chloride and sulphate up to 3%, as well as nitrate concentrations up to 3% for selenocyanate and selenite analysis, with minor losses in sensitivity for selenate up to 100 ppm nitrate, making the method particularly suitable for aqueous mine waste characterization. Quantitative trace selenium speciation was achieved using cost-effective materials and apparatus on a simple-to-operate benchtop instrument. The novel methodology was tested on gold mine wastewater samples; comparing to total selenium, a 63-149% recovery as the sum of species was observed. Additionally, this novel speciation approach was compared to LC-ICP-MS based selenium speciation and a reasonable agreement was found in the species distribution.
Collapse
Affiliation(s)
- Mitchell G Bordash
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada; Master of Instrumental Chemical Analysis Graduate Program, Trent University, Peterborough, Ontario, Canada
| | - Enea Pagliano
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| | - Kelly L LeBlanc
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada.
| | - Paramee Kumkrong
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| | - Dirk Wallschläger
- Water Quality Centre, School of the Environment, Department of Chemistry, Trent University, Peterborough, Ontario, Canada
| | - Zoltán Mester
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| |
Collapse
|
4
|
Determination of trace levels of selenium in natural water, agriculture soil and food samples by vortex assisted liquid-liquid microextraction method: Multivariate techniques. Food Chem 2020; 344:128706. [PMID: 33267987 DOI: 10.1016/j.foodchem.2020.128706] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 11/03/2020] [Accepted: 11/18/2020] [Indexed: 11/21/2022]
Abstract
A green vortex assisted based liquid-liquid microextraction (VA-LLME) method was developed for preconcentration of selenium. Ammonium pyrrolidine dithiocarbamate (APDC) was used to form a hydrophobic complex with selenium in natural water, agricultural soil and food samples by GFAAS. Whereas Triton X-114, a nonionic surfactant and 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid were used for Se extraction as a dispersing medium. The conical flasks contents were shack on a vortex mixer to increase the extraction efficiency. Multivariate techniques were used to evaluate extraction parameters; pH, vortex time, APDC amount, volume of ionic liquid and Triton X-114 and centrifugation rate on the recovery of Se. The central composite design (CCD) was used for further optimization of the essential extraction parameters. The enhancement factor and limit of detection were obtained as 98.7 and 0.07 µg L-1. The certified reference materials was used for accuracy of method and the related standard deviation was found to be 3.51%. The resulted data indicated that concentrations of Se in all types of water samples were below the permissible limit recommended by WHO.
Collapse
|
5
|
Shahid R, Kazi TG, Afridi HI, Talpur FN, Akhtar A, Baig JA. Deep-eutectic-solvent-based dispersive and emulsification liquid-liquid microextraction methods for the speciation of selenium in water and determining its total content levels in milk formula and cereals. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:5186-5194. [PMID: 33089268 DOI: 10.1039/d0ay01517b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Rapid and environmentally friendly ultrasound-assisted dispersive liquid-liquid microextraction (US-DLLμE) and vortex assisted-emulsification liquid-liquid microextraction (VA-ELLμE) methods are proposed for the speciation of selenium in domestic and mineral water samples. A deep eutectic solvent (DES) prepared with different ratios of choline chloride and phenol is used as an extractant for hydrophobic tetravalent Se complexed with diethyldithiocarbamate in different water samples. The total inorganic Se species levels in water samples were determined via reducing Se(vi) to Se(iv), using sodium thiosulphate as a reducing agent. The total Se levels in formula milk and cereal samples were determined after microwave acid digestion. The different heating steps in GFAAS were also optimized. The analytical parameters for US-DLLμE and VA-ELLμE, including pH, the volume of complexing agent, the ultrasound and vortex mixing shaking times, and the volume and composition of the deep eutectic solvent, were optimized. The accuracies of both methods were confirmed based on the analysis of a certified reference material (CRM) BCR 189 (wholemeal flour). The enhancement factor (EF) and limit of detection (LOD) for Se(iv) via US-DLLμE were found to be 90.8 and 0.029 μg L-1, respectively, whereas an EF of 81.8 and LOD of 0.036 μg L-1 were obtained via VA-ELLμE. The % relative standard deviation (%RSD) values obtained based on the analysis of six replicate standards under the optimized conditions for US-DLLμE and VA-ELLμE were found to be 4.2 and 5.8%, respectively. The optimized methods were applied to different drinking water samples, and acid-digested milk formula and baby cereal food samples.
Collapse
Affiliation(s)
- Ramsha Shahid
- National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
| | | | | | | | | | | |
Collapse
|
6
|
LeBlanc KL, Kumkrong P, Mercier PHJ, Mester Z. Selenium analysis in waters. Part 2: Speciation methods. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 640-641:1635-1651. [PMID: 29935780 DOI: 10.1016/j.scitotenv.2018.05.394] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 05/25/2018] [Accepted: 05/31/2018] [Indexed: 06/08/2023]
Abstract
In aquatic ecosystems, there is often no correlation between the total concentration of selenium present in the water column and the toxic effects observed in that environment. This is due, in part, to the variation in the bioavailability of different selenium species to organisms at the base of the aquatic food chain. The first part of this review (Kumkrong et al., 2018) discusses regulatory framework and standard methodologies for selenium analysis in waters. In this second article, we are reviewing the state of speciation analysis and importance of speciation data for decision makers in industry and regulators. We look in detail at fractionation methods for speciation, including the popular selective sequential hydride generation. We examine advantages and limitations of these methods, in terms of achievable detection limits and interferences from other matrix species, as well as the potential to over- or under-estimate operationally-defined fractions based on the various conversion steps involved in fractionation processes. Additionally, we discuss methods of discrete speciation (through separation methods), their importance in analyzing individual selenium species, difficulties associated with their implementation, as well as ways to overcome these difficulties. We also provide a brief overview of biological treatment methods for the remediation of selenium-contaminated waters. We discuss the importance of selenium speciation in the application of these methods and their potential to actually increase the bioavailability of selenium despite decreasing its total waterborne concentration.
Collapse
Affiliation(s)
- Kelly L LeBlanc
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada.
| | - Paramee Kumkrong
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| | - Patrick H J Mercier
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| | - Zoltán Mester
- National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada
| |
Collapse
|
7
|
Wang C, He M, Chen B, Hu B. Polymer monolithic capillary microextraction on-line coupled with ICP-MS for determination of inorganic selenium species in natural waters. Talanta 2018; 188:736-743. [DOI: 10.1016/j.talanta.2018.06.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 10/14/2022]
|
8
|
Sajid M. Dispersive liquid-liquid microextraction coupled with derivatization: A review of different modes, applications, and green aspects. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.07.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
9
|
Golbedaghi R, Haqgu M, Arabi A, Golshani Y. A New Dinuclear Cd(II) Macrocyclic Complex of a Schiff Base Ligand: Synthesis, Characterization, NMR and Mass Spectroscopy Investigation and Ab Initio Calculations. J STRUCT CHEM+ 2018. [DOI: 10.1134/s0022476618040327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
10
|
Hu T, Liu L, Chen S, Wu W, Xiang C, Guo Y. Determination of Selenium Species in Cordyceps militaris by High-performance Liquid Chromatography Coupled to Hydride Generation Atomic Fluorescence Spectrometry. ANAL LETT 2018. [DOI: 10.1080/00032719.2017.1414827] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ting Hu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China
| | - Liping Liu
- Beijing Key Laboratory of Diagnostic and Trace Ability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing, China
| | - Shaozhan Chen
- Beijing Key Laboratory of Diagnostic and Trace Ability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing, China
| | - Wenliang Wu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China
| | - Changguo Xiang
- Key Laboratory of Hunan Ecological Tourism, Jishou University, Zhangjiajie, Hunan, China
| | - Yanbin Guo
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, China
- Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China
| |
Collapse
|
11
|
A systematic review and meta-analysis of voltammetric and optical techniques for inorganic selenium determination in water. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.07.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Ultrasonic assisted dispersive liquid-liquid microextraction method based on deep eutectic solvent for speciation, preconcentration and determination of selenium species (IV) and (VI) in water and food samples. Talanta 2017; 175:352-358. [PMID: 28842002 DOI: 10.1016/j.talanta.2017.07.063] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 07/19/2017] [Accepted: 07/21/2017] [Indexed: 02/03/2023]
Abstract
A novel ultrasound-assisted liquid phase microextraction (UALPME) based on environmental friendly extractants, deep eutectic solvent (DES) was first time presented for speciation of selenium. In present study, five DES solvents of different composition was prepared and used as efficient extractive medium for hydrophobic chelate of Se(IV) with 3,3'-Diaminobenzidine (DAB). The total inorganic Se species were determined after pre-reduction of Se(VI) to Se(IV), prior to applying developed method. The concentration of Se(VI) was calculated by the difference of Se(IV) values and total selenium contents. The concentration of Se in DES rich phase was measured with electrothermal atomic absorption spectrometer (ETAAS). The effects of different parameters on extraction efficiency of study analyte, including pH, ligand concentration, type and volume of DES, sonication time, volumes tetrahydrofuran and aqueous samples were examined. At the optimum conditions, limit of detection and quantification, preconcentration factor, and relative standard deviation (RSD %) were determined as 4.61ngL-1, 15.4ngL-1, 50% and 4.1%, respectively. The accuracy of the presented method was confirmed by analysis of certified reference material and standard addition method for different water and ice tea samples. The developed method was effectively applied to real water and food samples.
Collapse
|
13
|
Pourbasheer E, Qasemi F, Rouhi M, Azari Z, Ganjali MR. Preconcentration and determination of 2-mercaptobenzimidazole by dispersive liquid-liquid microextraction and experimental design. J Sep Sci 2017; 40:2467-2473. [DOI: 10.1002/jssc.201601453] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/13/2017] [Accepted: 04/06/2017] [Indexed: 11/05/2022]
Affiliation(s)
| | - Farnaz Qasemi
- Department of Chemistry; Payame Noor University (PNU); Tehran Iran
| | - Maryam Rouhi
- Department of Chemistry; Payame Noor University (PNU); Tehran Iran
| | - Zhila Azari
- Department of Chemistry; Payame Noor University (PNU); Tehran Iran
| | - Mohammad Reza Ganjali
- Center of Excellence in Electrochemistry; University of Tehran; Tehran Iran
- Biosensor Research Center; Endocrinology & Metabolism Molecular-Cellular Sciences Institute; Tehran University of Medical Sciences; Tehran Iran
| |
Collapse
|
14
|
Altunay N, Gürkan R. Determination of sub-ng g–1 levels of total inorganic arsenic and selenium in foods by hydride-generation atomic absorption spectrometry after pre-concentration. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017; 34:390-403. [DOI: 10.1080/19440049.2016.1264010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Nail Altunay
- Faculty of Science, Department of Chemistry, University of Cumhuriyet, Sivas, Turkey
| | - Ramazan Gürkan
- Faculty of Science, Department of Chemistry, University of Cumhuriyet, Sivas, Turkey
| |
Collapse
|
15
|
Haeri SA. Bio-sorption based dispersive liquid–liquid microextraction for the highly efficient enrichment of trace-level bisphenol A from water samples prior to its determination by HPLC. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1028:186-191. [DOI: 10.1016/j.jchromb.2016.06.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 06/11/2016] [Accepted: 06/15/2016] [Indexed: 11/24/2022]
|
16
|
Ultrasound-assisted dispersive liquid–liquid microextraction of tetracycline drugs from egg supplements before flow injection analysis coupled to a liquid waveguide capillary cell. Anal Bioanal Chem 2016; 408:6201-11. [DOI: 10.1007/s00216-016-9732-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 06/15/2016] [Accepted: 06/20/2016] [Indexed: 10/21/2022]
|
17
|
Akhond M, Absalan G, Pourshamsi T, Ramezani AM. Gas-assisted dispersive liquid-phase microextraction using ionic liquid as extracting solvent for spectrophotometric speciation of copper. Talanta 2016; 154:461-6. [DOI: 10.1016/j.talanta.2016.04.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/29/2016] [Accepted: 04/01/2016] [Indexed: 11/29/2022]
|
18
|
Altunay N, Gürkan R. Separation/preconcentration of ultra-trace levels of inorganic Sb and Se from different sample matrices by charge transfer sensitized ion-pairing using ultrasonic-assisted cloud point extraction prior to their speciation and determination by hydride generation AAS. Talanta 2016; 159:344-355. [PMID: 27474317 DOI: 10.1016/j.talanta.2016.06.054] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/16/2016] [Accepted: 06/24/2016] [Indexed: 11/25/2022]
Abstract
In the existing study, a new, simple and low cost process for separation/preconcentration of ultra-trace level of inorganic Sb and Se from natural waters, beverages and foods using ultrasonic-assisted cloud point extraction (UA-CPE) prior to their speciation and determination by hydride generation AAS, is proposed. The process is based on charge transfer sensitized complex formations of Sb(III) and Se(IV) with 3-amino-7-dimethylamino-2-methylphenazine hydrochloride (Neutral red, NRH(+)) in presence of pyrogallol and cetyltrimethylammonium bromide (CTAB) as both sensitivity enhancement and counter ion at pH 6.0. Under the optimized reagent conditions, the calibration curves were highly linear in the ranges of 8-300ngL(-1) and 12-250ngL(-1) (r(2)≥0.993) for Se(IV) and Sb(III), respectively. The limits of detection were 2.45 and 3.60ngL(-1) with sensitivity enhancement factors of 155 and 120, respectively. The recovery rate was higher than 96% with a relative standard deviation lower than 5.3% for five replicate measurements of 25, 75 and 150ngL(-1) Se(IV) and Sb(III), respectively. The method was validated by analysis of two certified reference materials (CRMs), and was successfully applied to the accurate and reliable speciation and determination of the contents of total Sb/Sb(III), and total Se/Se(IV) after UA-CPE of the pretreated sample matrices with and without pre-reduction with a mixture of l-cysteine and tartaric acid. Their Sb(V) and Se(VI) contents were calculated from the differences between total Sb and Sb(III) and/or total Se and Se(IV) levels.
Collapse
Affiliation(s)
- Nail Altunay
- University of Cumhuriyet, Faculty of Science, Department of Chemistry, TR-58140 Sivas, Turkey.
| | - Ramazan Gürkan
- University of Cumhuriyet, Faculty of Science, Department of Chemistry, TR-58140 Sivas, Turkey
| |
Collapse
|
19
|
Asiabi H, Yamini Y, Seidi S, Shamsayei M, Safari M, Rezaei F. On-line electrochemically controlled in-tube solid phase microextraction of inorganic selenium followed by hydride generation atomic absorption spectrometry. Anal Chim Acta 2016; 922:37-47. [DOI: 10.1016/j.aca.2016.04.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 04/05/2016] [Accepted: 04/06/2016] [Indexed: 10/22/2022]
|
20
|
ÇITAK D, TÜZEN M. Solidified floating organic drop microextraction for speciation of Se (IV) and Se (VI) in water samples prior to electrothermal atomic absorption spectrometric detection. Turk J Chem 2016. [DOI: 10.3906/kim-1606-16] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
|
21
|
Aboelmagd A, El-Safty SA, Shenashen MA, Elshehy EA, Khairy M, Sakaic M, Yamaguchi H. Nanomembrane Canister Architectures for the Visualization and Filtration of Oxyanion Toxins with One-Step Processing. Chem Asian J 2015; 10:2467-78. [PMID: 26178184 DOI: 10.1002/asia.201500565] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Indexed: 01/12/2023]
Abstract
Nanomembrane canister-like architectures were fabricated by using hexagonal mesocylinder-shaped aluminosilica nanotubes (MNTs)-porous anodic alumina (PAA) hybrid nanochannels. The engineering pattern of the MNTs inside a 60 μm-long membrane channel enabled the creation of unique canister-like channel necks and cavities. The open-tubular canister architecture design provides controllable, reproducible, and one-step processing patterns of visual detection and rejection/permeation of oxyanion toxins such as selenite (SeO3(2-)) in aquatic environments (i.e., in ground and river water sources) in the Ibaraki Prefecture of Japan. The decoration of organic ligand moieties such as omega chrome black blue (OCG) into inorganic Al2O3@tubular SiO2/Al2O3 canister membrane channel cavities led to the fabrication of an optical nanomembrane sensor (ONS). The OCG ligand was not leached from the canister as observed in washing, sensing, and recovery assays of selenite anions in solution, which enabled its multiple reuse. The ONS makes a variety of alternate processing analyses of selective quantification, visual detection, rejection/permeation, and recovery of toxic selenite quick and simple without using complex instrumentation. Under optimal conditions, the ONS canister exhibited a high selectivity toward selenite anions relative to other ions and a low-level detection limit of 0.0093 μM. Real analytical data showed that approximately 96% of SeO3(2-) anions can be recovered from aquatic and wastewater samples. The ONS canister holds potential for field recovery applications of toxic selenite anions from water.
Collapse
Affiliation(s)
- Ahmed Aboelmagd
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan). , .,Graduate School for Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan). ,
| | - Mohamed A Shenashen
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Emad A Elshehy
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Mohamed Khairy
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Masaru Sakaic
- Centre for Research in Isotopes & Environmental Dynamics, Tsukuba University, 265-38 Shin Makita, Tsukuba-shi, Ibaraki, 305-0076, Japan
| | - Hitoshi Yamaguchi
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| |
Collapse
|
22
|
Novel Bio-Coacervation Extraction of Selenium Based on Microassemblies Biosurfactants with Ionic Liquid and Quantitative Analysis by HPLC/UV. Chromatographia 2015. [DOI: 10.1007/s10337-015-2950-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
23
|
Santos S, Ungureanu G, Boaventura R, Botelho C. Selenium contaminated waters: An overview of analytical methods, treatment options and recent advances in sorption methods. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 521-522:246-60. [PMID: 25847169 DOI: 10.1016/j.scitotenv.2015.03.107] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 03/23/2015] [Accepted: 03/23/2015] [Indexed: 05/17/2023]
Abstract
Selenium is an essential trace element for many organisms, including humans, but it is bioaccumulative and toxic at higher than homeostatic levels. Both selenium deficiency and toxicity are problems around the world. Mines, coal-fired power plants, oil refineries and agriculture are important examples of anthropogenic sources, generating contaminated waters and wastewaters. For reasons of human health and ecotoxicity, selenium concentration has to be controlled in drinking-water and in wastewater, as it is a potential pollutant of water bodies. This review article provides firstly a general overview about selenium distribution, sources, chemistry, toxicity and environmental impact. Analytical techniques used for Se determination and speciation and water and wastewater treatment options are reviewed. In particular, published works on adsorption as a treatment method for Se removal from aqueous solutions are critically analyzed. Recent published literature has given particular attention to the development and search for effective adsorbents, including low-cost alternative materials. Published works mostly consist in exploratory findings and laboratory-scale experiments. Binary metal oxides and LDHs (layered double hydroxides) have presented excellent adsorption capacities for selenium species. Unconventional sorbents (algae, agricultural wastes and other biomaterials), in raw or modified forms, have also led to very interesting results with the advantage of their availability and low-cost. Some directions to be considered in future works are also suggested.
Collapse
Affiliation(s)
- Sílvia Santos
- LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
| | - Gabriela Ungureanu
- LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Rui Boaventura
- LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Cidália Botelho
- LSRE - Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| |
Collapse
|
24
|
Alothman ZA, Habila MA, Yilmaz E, Warad I, Soylak M. Lead preconcentration as rac-(E,E)-N,N′-bis(2-chlorobenzylidene)cyclohexane-1,2-diamine complexes from water and tobacco samples by dispersive liquid-liquid microextraction. JOURNAL OF ANALYTICAL CHEMISTRY 2015. [DOI: 10.1134/s1061934815060027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
25
|
Al-Saidi H, Emara AA. The recent developments in dispersive liquid–liquid microextraction for preconcentration and determination of inorganic analytes. JOURNAL OF SAUDI CHEMICAL SOCIETY 2014. [DOI: 10.1016/j.jscs.2011.11.005] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
26
|
Rahnama R, Abed Z. Application of cold-induced aggregation microextraction as a fast, simple, and organic solvent-free method for the separation and preconcentration of Se(IV) in rice and various water samples. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:4209-4216. [PMID: 24590231 DOI: 10.1007/s10661-014-3691-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 02/20/2014] [Indexed: 06/03/2023]
Abstract
The developed method is based on cold-induced aggregation microextraction of Se(IV) using the 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid as an extractant followed by spectrophotometry determination. The extraction of Se(IV) was performed in the presence of dithizone as the complexing agent. In this method, a very small amount of 1-butyl-3-methylimidazolium hexafluorophosphate was added to the sample solution containing Se-dithizone complex. Then, the solution was kept in a thermostated bath at 50 °C for 4 min. Subsequently, the solution was cooled in an ice bath and a cloudy solution was formed. After centrifuging, the extractant phase was analyzed using a spectrophotometric detection method. Some important parameters that might affect the extraction efficiency were optimized (HCl, 0.6 mol L(-1); dithizone, 4.0 × 10(-6) mol L(-1); ionic liquid, 100 μL). Under the optimum conditions, good linear relationship, sensitivity, and reproducibility were obtained. The limit of detection (LOD) (3Sb/m) was 1.5 μg L(-1), and the relative standard deviation (RSD) was 1.2 % for 30 μg L(-1) of Se(IV). The linear range was obtained in the range of 5-60 μg L(-1). It was satisfactory to analyze rice and various water samples.
Collapse
Affiliation(s)
- Reyhaneh Rahnama
- Department of Chemistry, Payame Noor University, PO box 19395-3697, Tehran, Iran,
| | | |
Collapse
|
27
|
Khan S, Soylak M, Kazi TG. Room temperature ionic liquid-based dispersive liquid phase microextraction for the separation/preconcentration of trace Cd(2+) as 1-(2-pyridylazo)-2-naphthol (PAN) complex from environmental and biological samples and determined by FAAS. Biol Trace Elem Res 2013; 156:49-55. [PMID: 24197606 DOI: 10.1007/s12011-013-9853-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 10/24/2013] [Indexed: 10/26/2022]
Abstract
The current work develops a new green methodology for the separation/preconcentration of cadmium ions (Cd(2+)) using room temperature ionic liquid-dispersive liquid phase microextraction (RTIL-DLME) prior to analysis by flame atomic absorption spectrometry with microsample introduction system. Room temperature ionic liquids (RTIL) are considered "Green Solvents" for their thermally stable and non-volatile properties, here 1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6] was used as an extractant. The preconcentration of Cd(2+) in different waters and acid digested scalp hair samples were complexed with 1-(2-pyridylazo)-2-naphthol and extracted into the fine drops of RTILs. Some significant factors influencing the extraction efficiency of Cd(2+) and its subsequent determination, including pH, amount of ligand, volume of RTIL, dispersant solvent, sample volume, temperature, and incubation time were investigated in detail. The limit of detection and the enhancement factor under the optimal conditions were 0.05 μg/L and 50, respectively. The relative standard deviation of 100 μg/L Cd(2+) was 4.3 %. The validity of the proposed method was checked by determining Cd(2+) in certified reference material (TM-25.3 fortified water). The sufficient recovery (>98 %) of Cd(2+) with the certified value. The mean concentrations of Cd in lake water 13.2, waste water 15.7 and hair sample 16.8 μg/L, respectively and the developed method was applied satisfactorily to the preconcentration and determination of Cd(2+) in real samples.
Collapse
Affiliation(s)
- Sumaira Khan
- Faculty of Science, Department of Chemistry, Erciyes University, 38039, Kayseri, Turkey,
| | | | | |
Collapse
|
28
|
López-García I, Vicente-Martínez Y, Hernández-Córdoba M. Nonchromatographic speciation of selenium in edible oils using dispersive liquid-liquid microextraction and electrothermal atomic absorption spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:9356-9361. [PMID: 24011330 DOI: 10.1021/jf4027537] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A methodology for the nonchromatographic separation of the main selenium species present in edible oils is presented. Dispersive liquid-liquid microextraction is used to extract inorganic selenium (iSe), seleno-L-cystine (SeCys₂), seleno-L-methionine (SeMet), and selenocystamine (SeCM) into a slightly acidic aqueous medium. The selenium total (tSe) content is measured in the extracts by electrothermal atomic absorption spectrometry. By repeating the microextraction stage using an ionic liquid instead of water, the sum of SeCys₂, SeMet, and SeCM is obtained and iSe is calculated by difference. The detection limit is 0.03 ng of Se per gram of oil. The fractionation of the edible oils by solid phase extraction followed by dispersive liquid-liquid extraction and atomic absorption measurement also permits speciation of iSe to be carried out. Data for tSe and iSe levels of 15 samples of different origin are given.
Collapse
Affiliation(s)
- Ignacio López-García
- Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia , E-30100 Murcia, Spain
| | | | | |
Collapse
|
29
|
Farhadi K, Maleki R, Nezhad NM. Determination of Trace MethylTert-Butyl Ether in Water Samples Using Dispersive Liquid-Liquid Microextraction Coupled with GC-FID. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200900085] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
30
|
Poole CF. Derivatization reactions for use with the electron-capture detector. J Chromatogr A 2013; 1296:15-24. [DOI: 10.1016/j.chroma.2013.01.108] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 01/26/2013] [Accepted: 01/29/2013] [Indexed: 10/27/2022]
|
31
|
Zachariadis GA. In situ derivatization of metals and organometallics using borate reagents in gas chromatographic speciation studies. J Chromatogr A 2013; 1296:47-69. [DOI: 10.1016/j.chroma.2013.04.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Revised: 04/20/2013] [Accepted: 04/22/2013] [Indexed: 10/26/2022]
|
32
|
El-Shahawi M, Al-Saidi H. Dispersive liquid-liquid microextraction for chemical speciation and determination of ultra-trace concentrations of metal ions. Trends Analyt Chem 2013. [DOI: 10.1016/j.trac.2012.10.011] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
33
|
Gas-phase chemiluminescent determination of inorganic selenium in water samples following flow injection hydride generation and cryotrapping. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0859-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
34
|
Sereshti H, Entezari Heravi Y, Samadi S, Badiei A, Hayati Roodbari N. Selective Determination of Selenium in Garlic, Mushroom and Water Samples by Chemically Modified Mesoporous Silica Solid Phase Coupled with ICP-OES. FOOD ANAL METHOD 2012. [DOI: 10.1007/s12161-012-9466-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
35
|
Comparison of ultrasound-assisted emulsification and dispersive liquid–liquid microextraction methods for the speciation of inorganic selenium in environmental water samples using low density extraction solvents. Anal Chim Acta 2012; 714:82-8. [DOI: 10.1016/j.aca.2011.11.063] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2011] [Revised: 11/27/2011] [Accepted: 11/29/2011] [Indexed: 11/23/2022]
|
36
|
Bidari A, Ganjali MR, Assadi Y, Kiani A, Norouzi P. Assay of Total Mercury in Commercial Food Supplements of Marine Origin by Means of DLLME/ICP-AES. FOOD ANAL METHOD 2011. [DOI: 10.1007/s12161-011-9297-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Martinis EM, Escudero LB, Berton P, Monasterio RP, Filippini MF, Wuilloud RG. Determination of inorganic selenium species in water and garlic samples with on-line ionic liquid dispersive microextraction and electrothermal atomic absorption spectrometry. Talanta 2011; 85:2182-8. [DOI: 10.1016/j.talanta.2011.07.065] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 07/18/2011] [Accepted: 07/19/2011] [Indexed: 11/26/2022]
|
38
|
Wen Y, Li J, Zhang W, Chen L. Dispersive liquid-liquid microextraction coupled with capillary electrophoresis for simultaneous determination of sulfonamides with the aid of experimental design. Electrophoresis 2011; 32:2131-8. [DOI: 10.1002/elps.201100142] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 03/02/2011] [Accepted: 04/15/2011] [Indexed: 11/12/2022]
|
39
|
Zeeb M, Sadeghi M. Modified ionic liquid cold-induced aggregation dispersive liquid-liquid microextraction followed by atomic absorption spectrometry for trace determination of zinc in water and food samples. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0653-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
40
|
Determination of Se(IV) using solidified floating organic drop microextraction coupled to ultrasound-assisted back-extraction and hydride generation atomic fluorescence spectrometry. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0574-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
41
|
Jafarvand S, Shemirani F. Supramolecular-based dispersive liquid-liquid microextraction: A novel sample preparation technique utilizes coacervates and reverse micelles. J Sep Sci 2011; 34:455-61. [DOI: 10.1002/jssc.201000630] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Revised: 11/30/2010] [Accepted: 11/30/2010] [Indexed: 11/09/2022]
|
42
|
Headspace-solid phase microextraction of selenium(IV) from human blood and water samples using polypyrrole film and analysis with ion mobility spectrometry. Anal Chim Acta 2011; 684:58-62. [DOI: 10.1016/j.aca.2010.10.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 10/26/2010] [Accepted: 10/31/2010] [Indexed: 11/17/2022]
|
43
|
Bidari A, Ganjali MR, Norouzi P, Hosseini MRM, Assadi Y. Sample preparation method for the analysis of some organophosphorus pesticides residues in tomato by ultrasound-assisted solvent extraction followed by dispersive liquid-liquid microextraction. Food Chem 2010; 126:1840-4. [PMID: 25213965 DOI: 10.1016/j.foodchem.2010.11.142] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 08/17/2010] [Accepted: 11/14/2010] [Indexed: 10/18/2022]
Abstract
A very simple and economic method for organophosphorus pesticides (OPPs) residues analysis in tomato by means of gas chromatography-flame photometric detection (GC-FPD) has been developed. The method involves a rapid and small-scale extraction. The sample was homogenised and extraction of the OPPs with acetone was carried out assisted by sonication. No clean-up or evaporation were required after extraction. Pre-concentration of the OPPs from the acetone extract was done by using dispersive liquid-liquid microextraction (DLLME) technique. Chlorobenzene was added in micro-level volume as extraction solvent and triphenylphosphate as internal standard in DLLME procedure. The method showed good linearity over the range assayed (0.5-1000μgkg(-1)) and the detection limits for the pesticides studied varied from 0.1 to 0.5μgkg(-1). Repeatability studies resulted a relative standard deviation lower than 10% in all cases. The proposed method was used to determine pesticides levels in tomatoes grown in open field.
Collapse
Affiliation(s)
- Araz Bidari
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Mohammad Reza Ganjali
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Parviz Norouzi
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Mohammad Reza Milani Hosseini
- Department of Analytical Chemistry, Faculty of Chemistry, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran; Electroanalytical Chemistry Research Center, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran
| | - Yaghoub Assadi
- Department of Analytical Chemistry, Faculty of Chemistry, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran; Electroanalytical Chemistry Research Center, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran.
| |
Collapse
|
44
|
Lin X, Chen X, Huo X, Yu Z, Bi K, Li Q. Dispersive liquid-liquid microextraction coupled with high-performance liquid chromatography-diode array detection for the determination of N
-methyl carbamate pesticides in vegetables. J Sep Sci 2010; 34:202-9. [DOI: 10.1002/jssc.201000590] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 09/30/2010] [Accepted: 10/19/2010] [Indexed: 11/12/2022]
|
45
|
A highly sensitive procedure for determination of ultra trace amounts of molybdenum by graphite furnace atomic absorption spectrometry after dispersive liquid-liquid microextraction. Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0421-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
46
|
Development and evaluation of a dispersive liquid-liquid microextraction based test method for quantitation of total anionic surfactants: advantages against reference methods. OPEN CHEM 2010. [DOI: 10.2478/s11532-010-0032-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractA small-scale, simple, and rapid dispersive liquid-liquid microextraction (DLLME) procedure in combination with fiber optic-linear array detection spectrophotometry (FO-LADS) with charge-coupled device (CCD) detector has been developed, with benefits from the use of a micro-cell. The official reference methods (ASTM D2330 - 02, ISO 7875-1), which require tedious procedures, were replaced with a modified method. The new method provides a major reduction in sample size, elimination of the use of expensive glassware, and a decrease in the quantity of chloroform used, as well as increased sensitivity. Our method requires only one twentieth of the sample (5.0 mL), and less than one three-hundredth of microextraction solvent (chloroform = 138 µL). It provides a faster analysis time than official analytical methods (less than one minute). The calibration curve was linear in the range of 6–80 µg g L−1 of sodium dodecyl sulfate (SDS) with a correlation coefficient (r) of better than 0.99 and the LOD was 2 µg L−1. The repeatability of the proposed method (n=7) was found to be 4.5% and 3.6% for the concentrations of 0.03 and 0.07 mg L−1, respectively. The enrichment factor was found to be 75 for SDS.
Collapse
|
47
|
Determination of ultra-trace amounts of inorganic selenium species in natural water by ion chromatography-inductively coupled plasma-mass spectrometry coupled with nano-Al2O3 solid phase extraction. OPEN CHEM 2010. [DOI: 10.2478/s11532-009-0132-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractThis work presents a nano-Al2O3 solid phase extraction technique for the determination of ultra-trace amounts of inorganic selenium species in aqueous systems using ion chromatography inductively coupled plasma-mass spectrometry (IC-ICP-MS). In this experiment, the inorganic selenium species were successfully extracted on a nano-Al2O3 solid phase column and then quantitative eluted with a 100 mmol L−1 NaOH solution. Extraction conditions such as solvent identity, solvent concentration, solvent volume, solvent pH and salt addition were optimized. Under the optimum extraction conditions (elute solvent: 100 mmol L−1 NaOH, solvent volume: 4 mL, pH: 7.0), low detection limits (Se (IV): 6 ng L−1, Se (VI): 11 ng L−1; RSD−1, R2 > 0.999) were obtained for all of the analytes. Good spiked recoveries over the range of 80–98% were obtained by applying the proposed method on real environmental water samples. These results indicated that this method is very sensitive and reliable when monitoring trace levels of inorganic selenium species in aqueous samples.
Collapse
|
48
|
Evolution of dispersive liquid–liquid microextraction method. J Chromatogr A 2010; 1217:2342-57. [DOI: 10.1016/j.chroma.2009.11.088] [Citation(s) in RCA: 764] [Impact Index Per Article: 54.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2009] [Revised: 11/26/2009] [Accepted: 11/26/2009] [Indexed: 11/21/2022]
|
49
|
Sounderajan S, Kumar GK, Udas AC. Cloud point extraction and electrothermal atomic absorption spectrometry of Se (IV)--3,3'-diaminobenzidine for the estimation of trace amounts of Se (IV) and Se (VI) in environmental water samples and total selenium in animal blood and fish tissue samples. JOURNAL OF HAZARDOUS MATERIALS 2010; 175:666-672. [PMID: 19932563 DOI: 10.1016/j.jhazmat.2009.10.061] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2009] [Revised: 10/16/2009] [Accepted: 10/16/2009] [Indexed: 05/28/2023]
Abstract
This paper presents a method based on the cloud point extraction for the separation and preconcentration of Se (IV) and Se (VI) in environmental water samples as well as total selenium in animal blood and tissue samples. 3,3'-Diaminobenzidine (DAB) is a selective and sensitive reagent and is known to form an intense yellow compound piazselenol with selenium (IV). When a system consisting of sample, DAB and surfactant Triton X-114 is warmed above the cloud point of the surfactant, it was seen that the DAB-Se (IV) complex gets extracted into the surfactant rich phase while the Se (VI) remains in the aqueous phase. Se (VI) in the sample was reduced to Se (IV) by microwave heating of solution in 4 mol L(-1) HCl and total Se was estimated by carrying out the CPE. The quantification of selenium was carried out using ETAAS. The analytical parameters for the quantitative cloud point extraction of the Se-DAB complex were investigated and optimized. The proposed procedure was validated by applying it to the determination of the content of Se in Certified Reference Material BND 701-02. (NPL, India). The detection limit of selenium in environmental water samples was 0.0025 microg L(-1) with an enrichment factor of 100. The relative standard deviation (RSD) for ten replicate measurements of 5 microg L(-1) was 3.6%. The proposed method was successfully applied to the determination of selenium (IV), (VI) in environmental water samples and determination of total selenium in human blood, SRM-IAEA-A-13 animal blood and SRM-IAEA-407 fish tissue.
Collapse
Affiliation(s)
- Suvarna Sounderajan
- Analytical Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai 400 085, Maharashtra, India
| | | | | |
Collapse
|
50
|
Zeeb M, Ganjali MR, Norouzi P. Dispersive liquid-liquid microextraction followed by spectrofluorimetry as a simple and accurate technique for determination of thiamine (vitamin B1). Mikrochim Acta 2010. [DOI: 10.1007/s00604-009-0282-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|