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Sadeghi M, Saber Tehrani M, Faraji H. Vortex- assisted liquid- liquid microextraction for the trace determination of potassium bromate in flour food products. Food Chem 2022; 378:132109. [PMID: 35033707 DOI: 10.1016/j.foodchem.2022.132109] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 01/06/2022] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
Abstract
Potassium bromate, also reported as a carcinogenic agent, commonly functions to improve flour in the baking industry to increase bread volume. In this study, a green and novel preconcentration and microextraction method, termed as vortex assisted liquid-liquid microextraction combined with UV-Vis spectrophotometry was developed and utilized for trace determination of Potassium Bromate in food samples. Furthermore, various chemometric methods have been used. Under optimum conditions, the linearity range was obtained in the range between 0.02 and 2 µg/mL. Using the proposed analytical approach, the detection limits and quantitation of KBrO3 were 0.02 and 0.07 µg/mL, respectively. A pre-concentration factor of 22.2 was reported. The precision of the method was evaluated in the terms of repeatability and reproducibility and expressed by the relative standard deviation; the levels of them were considerably higher than 5.07 and 4.8%. The proposed approach was applied to the determination of trace bromate in different flour products.
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Affiliation(s)
- Mehrnoosh Sadeghi
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Saber Tehrani
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Hakim Faraji
- Department of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran; Research & Development Department, Behavand Darou-Animal Feed Supplements and Premixes Manufacturer, Alborz, Iran.
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Aggrawal M, Rohrer JS. Selective and sensitive determination of bromate in bread by ion chromatography-mass spectrometry. J Chromatogr A 2019; 1615:460765. [PMID: 31848031 DOI: 10.1016/j.chroma.2019.460765] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 11/06/2019] [Accepted: 12/02/2019] [Indexed: 10/25/2022]
Abstract
Potassium bromate is a food additive used as "flour improver" in the baking industry. Bromate is considered a carcinogenic and nephrotoxic substance. Thus, the bromate concentration must be carefully monitored in flour products. We developed a method for a selective and sensitive determination of bromate in flour that uses ion chromatography coupled with single quadrupole mass spectrometry (IC -MS). A recently introduced high-capacity anion-exchange column was used to separate bromate from matrix anions. Six commercial flour and flour products including homemade bread baked using flour containing potassium bromate, were analyzed. The method showed good precision with RSDs <0.2%, and <5% (n = 8), for retention time and peak area respectively. Bromate recoveries from flour samples ranged from 86 to 110%. The limits of detection and quantitation of bromate in the prepared solution were 0.10 µg/L and 0.34 µg/L, respectively, which corresponded to 5 µg/kg and 17 µg/kg in bread.
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Affiliation(s)
- Manali Aggrawal
- Thermo Fisher Scientific, 1214 Oakmead Pkwy, Sunnyvale, CA 94085, United States.
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Abbasi Tarighat M. Extraction of the contribution of kinetic profile for reaction of a chemical species in unknown matrices by standard addition method. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2014.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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4
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Use of sequential injection analysis with lab-at-valve and an optical probe for simultaneous spectrophotometric determination of ascorbic acid and cysteine by mean centering of ratio kinetic profiles. Talanta 2018; 188:99-106. [DOI: 10.1016/j.talanta.2018.05.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 04/17/2018] [Accepted: 05/16/2018] [Indexed: 11/24/2022]
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Ali NW, Abdelwahab NS, Abdelkawy M, Emam AA. A comparative study of ICH validated novel spectrophotometric techniques for resolving completely overlapping spectra of quaternary mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 154:114-122. [PMID: 26519919 DOI: 10.1016/j.saa.2015.10.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 09/16/2015] [Accepted: 10/22/2015] [Indexed: 06/05/2023]
Abstract
A pharmaceutically marketed mixture of Yohimbine, Alpha-tocopheryl acetate, Niacin, and Caffeine co-formulated as a promising therapy for erectile dysfunction. Simultaneous determination of the aforementioned pharmaceutical formulation without prior separation steps was applied using mean centering of ratio spectra and triple divisor spectrophotometric methods. Mean centering of ratio spectra method depended on using the mean centered ratio spectra in three successive steps which eliminated the derivative steps and so the signal to noise ratio was improved. The absorption spectra of the prepared solutions were measured in the wavelength range of 215-300 nm in the concentration ranges of 1-15, 3-15, 1-20, and 3-15 μg mL(-1) for Yohimbine, Alpha-tocopheryl acetate, Niacin, and Caffeine, respectively. The amplitudes of the mean centered third ratio spectra were measured at 250 nm and 268 nm for Yohimbine and Alpha-tocopheryl acetate, respectively and at peak to peak 272-273 and 262-263 nm for Niacin and Caffeine, respectively. In triple divisor method each drug in the quaternary mixture was determined by dividing the spectrum of the quaternary mixture by a standard spectrum of a mixture containing equal concentrations of the other three drugs. First derivative of these ratio spectra was obtained where determination could be achieved without any interference from the other three drugs. Amplitudes of 1-15, 3-15, 1-15, and 3-15 μg mL(-1) were used for selective determination of Yohimbine, Alpha-tocopheryl acetate, Niacin, and Caffeine, respectively. Laboratory prepared mixtures were analyzed by the developed novel methods to investigate their selectivity also, Super Act® capsules were successfully analyzed to ensure absence of interference from additives. The developed methods were validated according to the ICH guidelines. The proposed methods were statistically compared with each other and with the reported methods; using student t-test, F-test, and one way ANOVA, where no significant difference was found with respect to accuracy and precision.
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Affiliation(s)
- Nouruddin W Ali
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Al shaheed Shehata Ahmed Hegazy st., 62514 Beni-Suef, Egypt.
| | - Nada S Abdelwahab
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Al shaheed Shehata Ahmed Hegazy st., 62514 Beni-Suef, Egypt
| | - M Abdelkawy
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini st., 11562 Cairo, Egypt
| | - Aml A Emam
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Al shaheed Shehata Ahmed Hegazy st., 62514 Beni-Suef, Egypt
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6
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Saber AL. New Potentiometric Sensor for the Determination of Bromate Ion in Drinking Water. ELECTROANAL 2015. [DOI: 10.1002/elan.201500582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Al-Saidi HM, El-Shahawi MS. Extractive liquid-liquid spectrofluorometric determination of trace and ultra concentrations of bromate in water samples by the fluorescence quenching of tetraphenylphosphonium iodide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 138:736-742. [PMID: 25544189 DOI: 10.1016/j.saa.2014.11.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 11/08/2014] [Accepted: 11/20/2014] [Indexed: 06/04/2023]
Abstract
A low cost and selective spectrofluorimetric method has been developed for trace determination of bromate ions in water. The method has been based upon complete extraction of the produced yellow colored ion associate of the reagent tetraphenylphosphonium iodide (TPP(+) I(-)) and bromate ions from aqueous media into chloroform and measuring the fluorescence quenching at λex/em=242/305nm. The composition, stability and the most probable mechanism of the produced associate have been determined. The plot of fluorescence intensity of TPP(+) I(-)vs. bromate concentration was linear in the range 0.86-150.0μgL(-1). The limits of detection (LOD) and quantification (LOQ) of BrO3(-) were 0.24 and 0.76μgL(-1), respectively. The method was found free from most of the interferences present in chromatographic, spectrofluorometric and spectrophotometric methods. Intra and inter-day laboratory accuracy and precision for analysis of bromate in water were determined. The method provides better performance compared to the international standard method recently issued (ISO 11206:2011). The method was applied satisfactorily for analysis of 1.0μgL(-1) bromate in the presence of high excess of chloride (50mg/L) without pretreatment with a relative standard deviation (RSD) of ±2.9%. The method was applied for analysis of bromate in various water samples. Statistical comparison of the results of the proposed method with those obtained by the standard method revealed no significant differences in the accuracy and precision.
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Affiliation(s)
- H M Al-Saidi
- Department of Chemistry, University College, Umm Al-Qura University, Makkah, Saudi Arabia.
| | - M S El-Shahawi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
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Zhang K, Liang L, Huang M, Hu Y, Li G. Determination of iodate in iodized salt and water samples by shell-isolated nanoparticle-enhanced Raman spectroscopy. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1248-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Farmany A, Mortazavi SS, Hashemi E, Sahraei R. A new catalytic oxidation method for sensitive quantification of bromate in flours and bottled water using AgNPs. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:1371-1375. [PMID: 24146069 DOI: 10.1007/s10661-013-3459-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Accepted: 10/01/2013] [Indexed: 06/02/2023]
Abstract
In this paper, a simple and sensitive spectrophotometric method for the determination of nanomolar level of bromate, based on the catalytic effect of silver nanoparticles on the oxidation of acid red 14 by potassium bromate, is described. The reaction rate was monitored spectrophotometrically by measuring the decrease in absorbance of acid red 14 at 516 nm. The detection limit of the method was 8 ng/mL, and the linear range was between 15 and 130 ng/mL. The effects of acidity, concentration of reactants and reaction time, and external ions were also discussed. The optimum reaction conditions were fixed, and some kinetic parameters determined. The relative standard deviation for the determination of bromate at the concentration of 50 ng/mL was calculated to be 0.996 % (n = 10). The method has been successfully applied to the determination of bromate in flours and bottled waters.
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Affiliation(s)
- Abbas Farmany
- Departments of Chemistry, Hamedan Branch, Islamic Azad University, Hamedan, Iran,
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Kamyabi MA. Simultaneous Spectrophotometric Determination of Paracetamol and P-Aminophenol by Using Mean Centering of Ratio Kinetic Profiles. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200900020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Resolution of five-component mixture using mean centering ratio and inverse least squares chemometrics. Chem Cent J 2013; 7:152. [PMID: 24028626 PMCID: PMC3848590 DOI: 10.1186/1752-153x-7-152] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 09/09/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A comparative study of the use of mean centering of ratio spectra and inverse least squares for the resolution of paracetamol, methylparaben, propylparaben, chlorpheniramine maleate and pseudoephedrine hydrochloride has been achieved showing that the two chemometric methods provide a good example of the high resolving power of these techniques. Method (I) is the mean centering of ratio spectra which depends on using the mean centered ratio spectra in four successive steps that eliminates the derivative steps and therefore the signal to noise ratio is improved. The absorption spectra of prepared solutions were measured in the range of 220-280 nm. Method (II) is based on the inverse least squares that depend on updating developed multivariate calibration model. The absorption spectra of the prepared mixtures in the range 230-270 nm were recorded. RESULTS The linear concentration ranges were 0-25.6, 0-15.0, 0-15.0, 0-45.0 and 0-100.0 μg mL-1 for paracetamol, methylparaben, propylparaben, chlorpheniramine maleate and pseudoephedrine hydrochloride, respectively. The mean recoveries for simultaneous determination were between 99.9-101.3% for the two methods. The two developed methods have been successfully used for prediction of five-component mixture in Decamol Flu syrup with good selectivity, high sensitivity and extremely low detection limit. CONCLUSION No published method has been reported for simultaneous determination of the five components of this mixture so that the results of the mean centering of ratio spectra method were compared with those of the proposed inverse least squares method. Statistical comparison was performed using t-test and F-ratio at P = 0.05. There was no significant difference between the results.
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Application of Dispersive Liquid–Liquid Micro-extraction Using Mean Centering of Ratio Spectra Method for Trace Determination of Mercury in Food and Environmental Samples. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9633-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Najafpour MM, Kompany-Zareh M, Zahraei A, Jafarian Sedigh D, Jaccard H, Khoshkam M, Britt RD, Casey WH. Mechanism, decomposition pathway and new evidence for self-healing of manganese oxides as efficient water oxidizing catalysts: new insights. Dalton Trans 2013; 42:14603-11. [DOI: 10.1039/c3dt51406d] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lim HH, Shin HS. Sensitive and robotic determination of bromate in sea water and drinking deep-sea water by headspace solid-phase micro extraction and gas chromatography-mass spectrometry. Anal Chim Acta 2012; 741:32-7. [PMID: 22840702 DOI: 10.1016/j.aca.2012.06.046] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 06/16/2012] [Accepted: 06/20/2012] [Indexed: 10/28/2022]
Abstract
A robotic method has been established for the determination of bromate in sea water and drinking deep-sea water. Bromate in water was converted into volatile derivative, which was measured with headspace solid-phase micro extraction and gas chromatography-mass spectrometry (HS-SPME GC-MS). Derivatization reagent and the HS-SPME parameters (selection of fibre, extraction/derivatization temperature, heating time and; the morality of HCl) were optimized and selected. Under the established conditions, the detection and the quantification limits were 0.016 μg L(-1) and 0.051 μg L(-1), respectively, and the intra- and inter-day relative standard deviation was less than 7% at concentrations of 1.0 and 10.0 μg L(-1). The calibration curve showed good linearity with r(2)=0.9998. The common ions Cl(-), NO(3)(-), SO(4)(2-), HPO(4)(2-), H(2)PO(4)(-), K(+), Na(+), NH(4)(+), Ca(2+), Mg(2+), Ba(2+), Mn(4+), Mn(2+), Fe(3+) and Fe(2+) did not interfere even when present in 1000-fold excess over the active species. The method was successfully applied to the determination of bromate in sea water and drinking deep-sea water.
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Affiliation(s)
- Hyun-Hee Lim
- Department of Environmental Science, Kongju National University, Kongju 314-701, Republic of Korea
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Al-Saidi HM. Highly sensitive procedure for the determination of ultra-trace amounts of bromate ions in water by dispersive liquid-liquid microextraction combined with UV-Vis spectrophotometry. ACTA ACUST UNITED AC 2012. [DOI: 10.5155/eurjchem.3.2.202-207.590] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Abdolmohammad-Zadeh H, Tavarid K, Talleb Z. Determination of iodate in food, environmental, and biological samples after solid-phase extraction with Ni-Al-Zr ternary layered double hydroxide as a nanosorbent. ScientificWorldJournal 2012; 2012:145482. [PMID: 22619590 PMCID: PMC3349096 DOI: 10.1100/2012/145482] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Accepted: 12/15/2011] [Indexed: 11/17/2022] Open
Abstract
Nanostructured nickel-aluminum-zirconium ternary layered double hydroxide was successfully applied as a solid-phase extraction sorbent for the separation and pre-concentration of trace levels of iodate in food, environmental and biological samples. An indirect method was used for monitoring of the extracted iodate ions. The method is based on the reaction of the iodate with iodide in acidic solution to produce iodine, which can be spectrophotometrically monitored at 352 nm. The absorbance is directly proportional to the concentration of iodate in the sample. The effect of several parameters such as pH, sample flow rate, amount of nanosorbent, elution conditions, sample volume, and coexisting ions on the recovery was investigated. In the optimum experimental conditions, the limit of detection (3s) and enrichment factor were 0.12 μg mL(-1) and 20, respectively. The calibration graph using the preconcentration system was linear in the range of 0.2-2.8 μg mL(-1) with a correlation coefficient of 0.998. In order to validate the presented method, a certified reference material, NIST SRM 1549, was also analyzed.
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Affiliation(s)
- Hossein Abdolmohammad-Zadeh
- Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, 35 Km Tabriz-Marageh Road, P.O. Box 53714-161, 5375171379 Tabriz, Iran.
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Shin HS. Sensitive determination of bromate in ozonated and chlorinated water, and sea water by gas chromatography–mass spectrometry after derivatization. J Chromatogr A 2012; 1223:136-41. [DOI: 10.1016/j.chroma.2011.12.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 12/09/2011] [Accepted: 12/19/2011] [Indexed: 11/29/2022]
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Madrakian T, Afkhami A, Siri R, Mohammadnejad M. Micelle mediated extraction and simultaneous spectrophotometric determination of vanadium(V) and molybdenum(VI) in plant foodstuff samples. Food Chem 2011; 127:769-73. [DOI: 10.1016/j.foodchem.2010.12.144] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 10/23/2010] [Accepted: 12/29/2010] [Indexed: 11/28/2022]
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Freitas GRSD, Silva Junior HD, Pereira FRDS, Farias RFD, Pereira FC. Análise de iodato em sais de cozinha. ECLÉTICA QUÍMICA 2011. [DOI: 10.1590/s0100-46702011000100007] [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] Open
Abstract
Iodato pode ser reduzido em solução tampão B-R pH 2,0 por ação da hidroxilamina. Dependendo da concentração do agente redutor é possível gerar iodo molecular ou o complexo triiodeto. Iodo apresenta um conjunto de três picos de absorção, enquanto o complexo somente dois na região do ultravioleta. Utilizando excesso de hidroxilamina é possível monitorar o triiodeto em max. 352 nm e max. 288 nm. Empregando as melhores condições experimentais, curvas de calibração lineares entre 2,3x10-4 mol L-1 a 5,0x10-4 mol L-1 foram obtidas para a determinação de iodato. A metodologia foi aplicada em amostras de sais de cozinha de supermercados da cidade de Natal, RN.
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Simultaneous kinetic spectrophotometric determination of Cu(II), Co(II) and Ni(II) using partial least squares (PLS) regression. OPEN CHEM 2009. [DOI: 10.2478/s11532-009-0030-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractA partial least squares (PLS-1) calibration model based on kinetic—spectrophotometric measurement, for the simultaneous determination of Cu(II), Ni(II) and Co(II) ions is described. The method was based on the difference in the rate of the reaction between Co(II), Ni(II) and Cu(II) ions with 1-(2-pyridylazo)2-naphthol in a pH 5.8 buffer solution and in micellar media at 25°C. The absorption kinetic profiles of the solutions were monitored by measuring the absorbance at 570 nm at 2 s intervals during the time range of 0–10 min after initiation of the reaction. The experimental calibration matrix for the partial least squares (PLS-1) model was designed with 30 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 0.1-2 μg mL−1 for each cation. The proposed method was successfully applied to the simultaneous determination of Cu(II), Ni(II) and Co(II) ions in water and in synthetic alloy samples.
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Zarei K, Atabati M, Karami M. Mean centering of ratio kinetic profiles for the simultaneous kinetic determination of binary mixtures in electroanalytical methods. Anal Chim Acta 2009; 649:62-7. [DOI: 10.1016/j.aca.2009.07.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2009] [Revised: 06/08/2009] [Accepted: 07/08/2009] [Indexed: 11/30/2022]
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Rank annihilation factor analysis using mean centering of ratio spectra for kinetic–spectrophotometric analysis of unknown samples. Anal Chim Acta 2009; 639:19-28. [DOI: 10.1016/j.aca.2009.02.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Revised: 01/26/2009] [Accepted: 02/16/2009] [Indexed: 11/23/2022]
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Molecular iodine selective membrane for iodate determination in salt samples: chemical amplification and preconcentration. Anal Bioanal Chem 2008; 391:1081-9. [DOI: 10.1007/s00216-008-2057-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 02/18/2008] [Accepted: 03/05/2008] [Indexed: 11/27/2022]
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Bahram M. Mean centering of ratio spectra as a new method for determination of rate constants of consecutive reactions. Anal Chim Acta 2007; 603:13-9. [DOI: 10.1016/j.aca.2007.09.041] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2007] [Revised: 09/18/2007] [Accepted: 09/20/2007] [Indexed: 11/29/2022]
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