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Karlıdağ NE, Demirel R, Serbest H, Turak F, Bakırdere S. Determination of cobalt in chamomile tea samples at trace levels by flame atomic absorption spectrophotometry after poly(vinyl alcohol)-magnetic hydrogel based dispersive solid phase extraction. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 15:56-62. [PMID: 36477290 DOI: 10.1039/d2ay01493a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In this study, an analytical strategy was proposed for the determination of cobalt at trace levels by using a flame atomic absorption spectrophotometry (FAAS) system after magnetic hydrogel based dispersive solid phase extraction (MH-DSPE). Poly(vinyl alcohol) based magnetic hydrogels (PVA-MH) were synthesized easily, quickly, and cost effectively in the laboratory and used as an adsorbent material in the microextraction process. Under the optimum experimental conditions, the limit of detection (LOD) and limit of quantitation (LOQ) values were recorded as 4.2 and 14.1 μg L-1, respectively. To investigate the matrix effects on the analyte signal, spike experiments were performed using chamomile tea extracts and good recovery results were obtained between 85.7 and 113.8%. A 57.8-fold improvement was achieved in the detection power compared to that of a conventional FAAS system. The results obtained throughout all experimental studies demonstrated the applicability in addition to the accuracy of the method for the quantification of trace levels of cobalt with high accuracy in a chamomile tea matrix.
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Affiliation(s)
| | - Rabia Demirel
- Yıldız Technical University, Department of Chemistry, İstanbul, 34210, Turkey.
| | - Hakan Serbest
- Istanbul Health & Technology University, Faculty of Engineering and Natural Sciences, Department of Chemical Engineering, İstanbul 34173, Turkey
| | - Fatma Turak
- Yıldız Technical University, Department of Chemistry, İstanbul, 34210, Turkey.
| | - Sezgin Bakırdere
- Yıldız Technical University, Department of Chemistry, İstanbul, 34210, Turkey.
- Turkish Academy of Sciences (TÜBA), Vedat Dalokay Street No: 112 Çankaya, Ankara, 06670, Turkey
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ILSnCl2-mGO nanocomposite for efficient preconcentration of Red 2G via ultrasonic-assisted dispersive magnetic solid-phase extraction method: isotherm adsorption. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04793-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Fasfous I, El-Sheikh A, Awwad A, Al-Degs Y, Dawoud J. Interaction Influence of Contact Time and pH on Cobalt Retention by
Carbon Nanotubes Bearing Various Loads of TiO2 and Fe3O4. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411017666211021145844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
<P>Background: Nanomaterials have facilitated remarkable advances in the remediation of
many environmental problems. A few studies have tackled the removal of Co (II) from aqueous
solutions using nanomaterials. Herein, we studied the retention kinetics of cobalt species on carbon
nanotubes (CNTs) bearing different amounts of TiO2 and Fe3O4 nanomaterials individually.
<P>
Methods: CNTs and their TiO2/Fe3O4-modified nanomaterials were well characterized. Cobalt
retention by these adsorbents was investigated considering different influencing factors such as Co
(II) content, solution pH, and time. The kinetic data were fitted with pseudo-first-order, pseudosecond-
order rate models, and intra-particle diffusion models for better elucidation of the mechanism
of Co retention.
<P>
Results: XRD evidenced the formation of TiO2 and Fe3O4. High loads of both oxides were needed
for higher and faster Co retention by CNTs. Co retention capacity increased with increasing the
solution pH. The pseudo-second-order model presented the kinetics of Co retention at 30 oC, and
48% of available capacity was attained within the first hour of interaction by CNT-TiO2 and with a
moderate S/L ratio of 0.5 g/L. Co retention was increased with the amount of oxide to reach a maximum
value of 16. 40 mg/g (90.2% TiO2) and 13.60 mg/g (48.2% Fe3O4). The Jovanović equilibrium
model predicted the maximum retention values as the nearest to the experimental ones.
<P>
Conclusion: The potential of CNT-Fe3O4/TiO2 nanomaterials has been successfully demonstrated
for the removal of cobalt, which makes them highly attractive and cost-effective adsorbents for
wastewater treatment. The reported retention and removal rate values were relatively better than
those seen in the literature. Loading different active oxides by CNTs is an interesting research area
as selective adsorbents can be fabricated with affordable experimental costs.
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Affiliation(s)
- Ismail Fasfous
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Amjad El-Sheikh
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Anas Awwad
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Yahya Al-Degs
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Jamal Dawoud
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
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Santos LB, Assis RDSD, Silva UN, Lemos VA. Switchable-hydrophilicity solvent-based liquid-phase microextraction in an on-line system: Cobalt determination in food and water samples. Talanta 2022; 238:123038. [PMID: 34801895 DOI: 10.1016/j.talanta.2021.123038] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 01/03/2023]
Abstract
An on-line system employing switchable-hydrophilicity solvent-based liquid-phase microextraction (SHS-LPME) is described in this work. The method is based on the preconcentration of the species formed between cobalt and the reagent 1-nitroso-2-naphthol (NN), with subsequent detection by digital image colorimetry. The system's operation begins with the on-line mixture of sample, switchable solvent, and an alkaline agent in a reaction coil. Then the mixture is transported to an extraction chamber. The introduction of a proton donor leads to the passage of the solvent to its hydrophobic form, which allows phase separation. The rich phase is then directed to a glass tube, where detection is performed. Octanoic acid, sodium carbonate, and sulfuric acid were used as the extraction solvent, the alkaline agent, and the proton donor, respectively. Under optimized conditions, the method presented a detection limit of 0.8 μg L-1 and an enrichment factor of 41. The precision obtained was 4.8% (20 μg L-1). The accuracy of the method was tested by the analysis of Tomato Leaves certified reference material (NIST 1573a). The method was applied to the determination of cobalt in food, dietary supplements, and water samples. The method is presented as a green alternative and very accessible to the determination of cobalt in the analyzed samples.
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Affiliation(s)
- Luana Bastos Santos
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil
| | - Rosivan Dos Santos de Assis
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil
| | - Uneliton Neves Silva
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil
| | - Valfredo Azevedo Lemos
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil.
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Hosseini E, Ghasemi JB, Daraei B, Asadi G, Adib N. Application of genetic algorithm and multivariate methods for the detection and measurement of milk-surfactant adulteration by attenuated total reflection and near-infrared spectroscopy. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:2696-2703. [PMID: 33073373 DOI: 10.1002/jsfa.10894] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 08/18/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND The adulteration of milk by hazardous chemicals like surfactants has recently increased. It conceals the quality of the product to gain profit. As milk and milk-based products are consumed by many people, novel analytical procedures are needed to detect these adulterants. This study focused on Fourier-transform infrared (FTIR) spectroscopy equipped with an attenuated total reflection (ATR) accessory, and near-infrared (NIR) spectroscopy for the determination of milk-surfactant adulteration using a genetic algorithm (GA) coupled with multivariate methods. The model surfactant was sodium dodecyl sulfate (SDS), and its concentration varied from 1.94-19.4 gkg-1 in adulterated samples. RESULTS Prominent peaks in the spectral range of 5500-6400 cm-1 , 1160-1260 cm-1 and 1049-1080 cm-1 may correspond to the sulfonate group in SDS. A genetic algorithm could significantly reduce the number of variables to almost one third by selecting the specific wavenumber region. Principal component analysis (PCA) for ATR and NIR data indicated separate clusters of samples in terms of the concentration level of SDS (P ≤ 0.05). Partial least squares regression (PLSR) was used to determine the maximum R2 value for ATR and NIR data for calibration, cross-validation and prediction, which were 0.980, 0.972, 0.980, and 0.970, 0.937, and 0.956 respectively. The results showed apparent differences between unadulterated and adulterated samples using partial least squares-discriminant analysis (PLS-DA), which was validated by the permutation test. CONCLUSION The results clearly show the successful application of the proposed methods with multivariate analysis in the selection of variables, classification, clustering, and identification of the adulterant in amounts as low as 1.94 gkg-1 in milk. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Elahesadat Hosseini
- Department of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Jahan B Ghasemi
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Bahram Daraei
- Department of Toxicology and Pharmacology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Gholamhassan Asadi
- Department of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nooshin Adib
- Food and Drug Laboratory Research Center, Food and Drug Organization, Tehran, Iran
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Development of magnetism-reinforced in-tube solid phase microextraction combined with HPLC for the sensitive quantification of cobalt(II) and nickel(II) in environmental waters. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105370] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Pressure variation in-syringe dispersive liquid-liquid microextraction associated with digital image colorimetry: Determination of cobalt in food samples. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105064] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Mirnezami SY, Davallo M, Sohrabi M, Khosravi M, Motieea F. Removal of Pb2+ Ions onto Magnetic Graphene/Nylon 6: Optimized by Taguchi Method. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01498-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Adsorption/desorption of acid violet-7 onto magnetic MnO2 prior to its quantification by UV–visible spectroscopy: optimized by fractional factorial design. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04211-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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