Capillary electrophoretic determination of thiosulfate and its oxidation products

Padarauskas, Audrius; Paliulionyte, Vaida; Ragauskas, Romas; Dikčius, A.

doi:10.1016/s0021-9673(00)00298-3

Cited by 35 publications

(44 citation statements)

References 24 publications

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“…4b, and the highest analytical signal was obtained for 0.2 mmol L −1 Na 2 SO 4 from the absorbance change against electrolyte concentration corrected for analyte blank absorbance of 0.5805. The analytical signal decreased considerably for increasing Na 2 SO 4 . This effect may be explained by the additional surface charge when the Na 2 SO 4 concentration is very high, thus changing the molecular architecture of the surfactant and consequently the micelle formation process.…”

Section: Effects Of Concentration Of Nonionic Surfactant and Salting-mentioning

confidence: 94%

“…When compared to the analytical performance properties of the current VA-CPE method with those of other detection methods in literature such as LODs, linear working range, precision, preconcentration and sensitivity enhancement factors [4,5,13,14,30,32,33], except for IC method based on catalytic effect of thiosulfate onto photometric reaction between I 3 − and N 3 − at pH 5.0 [1] in Table 4, it shows many advantages such as simplicity, minimum solvent consumption, reasonable repeatability/reproducibility, a linear working range of 600-fold, a low detection limit with comparatively little interference with a highly good calibration sensitivity. IC as detection tool has disadvantages such as long analysis time (>15 min), expensive analysis equipment and chemicals, poor recovery due to peak tailing and/or peak overlapping especially at high concentrations, so as to lead to recalibration of instrument.…”

Section: Comparison Of the Va-cpe Methods With Other Methodsmentioning

confidence: 99%

“…Thiosulfate as the reducing species is widely found in industrial wastewater and environmental waters. Determination of thiosulfate, one of the sulfur species, is very important in many environmental and industrial situations especially when monitoring anoxic waters and wastewaters from paper mills photographic laboratories [2][3][4]. The thiosulfate can be produced in anoxic conditions as a result of bacterial sulfate reduction, which is the most important source of sulfur compounds in waters.…”

Section: Introductionmentioning

confidence: 99%

“…In these studies, thiosulfate was separated from other species by ion chromatography (IC) [1], capillary electrophoresis (CE) [4], micellar electrokinetic chromatography (MEKC) [13] and capillary zone electrophoresis (CZE) [14]. A great disadvantage of IC with universal detection techniques such as conductivity and indirect UV is interference by the high concentrations of co-eluting matrix anions such as chloride and sulfate [15].…”

Section: Introductionmentioning

confidence: 99%

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Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Gürkan

Altunay

Gürkan³

2017

J IRAN CHEM SOC

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are statistically in a good agreement with those obtained by DTNB method. Finally, the method developed was successfully applied to the preconcentration and determination of trace thiosulfate from environmental waters. Abstract In the existing study, a new vortex-assisted cloud point extraction (VA-CPE) method was developed for determination of low levels of thiosulfate in environmental waters at 632 nm by spectrophotometry. The method is selectively based on charge-transfer-sensitive ion-pair complex formation of Ag(S 2 O 3 ) 2 3− , which is produced by the reaction of thiosulfate with excess Ag + ions with toluidine blue (3-amino-7-dimethylamino-2-methylphenazathionium chloride, TB + ) and then its extraction into micellar phase of polyethylene glycol 4-tert-octylphenyl ether (Triton X-45) in presence of Na 2 SO 4 as salting-out agent at pH 7.0. All the factors affecting complex formation and VA-CPE efficiency were optimized in detail. Under the optimized conditions, the linear calibration curves for thiosulfate were in the range of 0.2-120 and 5-180 µg L −1 with sensitivity improvement of 81-folds and 15-folds, respectively, as a result of efficient mass transfer obtained by CPE with and without vortex, while it changed in the range of 260-3600 µg L −1 without preconcentration at 642 nm. The limits of detection and quantification of the method for VA-CPE were found to be 0.05 and 0.22 µg L −1 , respectively. The precision (expressed as the percent relative standard deviation) was in range of 2.5-4.8% (5, 10 and 25 µg L −1 , n: 5). The method accuracy was validated by comparing the results to those of an independent 5,5′-dithiobis(2-aminobenzoic acid) (DTNB) method as well as recovery studies from spiked samples. It has been observed that the results * Ramazan Gürkan Keywords

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Section: Effects Of Concentration Of Nonionic Surfactant and Salting-mentioning

confidence: 94%

Section: Comparison Of the Va-cpe Methods With Other Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Gürkan

Altunay

Gürkan³

2017

J IRAN CHEM SOC

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“…9,10 Numerous reports on thiosulfate analysis have been published. [11][12][13][14][15] In these studies, thiosulfate was separated from other species by ion chromatography (IC) or capillary electrophoresis (CE), and detected mainly by measuring the conductivity or absorbance. Several sensitive and selective detection methods have utilized a postcolumn reaction of thiosulfate with Ce(IV), followed by fluorescence detection of the resulting Ce(III).…”

Section: Introductionmentioning

confidence: 99%

Effect of Ethanol Addition on the Determination of Thiosulfate Based on Reduction of Ce(IV) and Fluorescence Detection of Ce(III)

et al. 2012

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The effect of ethanol addition on the determination of thiosulfate based on the reduction of Ce(IV) and fluorescence detection of Ce(III) was investigated by flow-injection analysis. It was found that the sensitivity of thiosulfate detection was significantly increased by injecting thiosulfate into a mixed solution of Ce(IV) and ethanol, rather than a solution of Ce(IV) alone. This is probably due to trace amounts of thiosulfate accelerating the rate of reduction of Ce(IV) by ethanol: Ce(IV) is slowly reduced by ethanol in the absence of thiosulfate, and thiosulfate serves as a catalyst to the reduction. The detection limits as S/N = 3 for thiosulfate were very low (10 -9 M level).

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Capillary electrophoretic determination of thiosulfate, sulfide and sulfite using in-capillary derivatization with iodine

Daunoravicius

Padarauskas

2002

Electrophoresis

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A new capillary electrophoresis (CE) method was developed for the rapid, simple and selective determination of thiosulfate, sulfide and sulfite species. The proposed method is based on the in-capillary derivatization of separated sulfur anions by mixing their zones with the iodine zone during the electrophoretic migration and direct UV detection of iodide formed. The optimal conditions for the separation and derivatization reaction were established by varying electrolyte pH, electrolyte counter-ion, concentration of iodine, and applied voltage. The optimized separations were carried out in 20 mmol/L Tris-chloride electrolyte (pH 8.5) using direct UV detection at 214 nm. All three sulfur species were well resolved in less than 4 min. The method gives repeatability comparable or even better than this obtained for sulfur anions using standard CE technique. The proposed CE system was applied to the monitoring of sulfur anions in spent fixing solutions during the electrolytic oxidation.

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Capillary electrophoretic determination of thiosulfate and its oxidation products

Cited by 35 publications

References 24 publications

Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Extraction, preconcentration and spectrophotometric determination of trace levels of thiosulfate in environmental waters

Effect of Ethanol Addition on the Determination of Thiosulfate Based on Reduction of Ce(IV) and Fluorescence Detection of Ce(III)

Capillary electrophoretic determination of thiosulfate, sulfide and sulfite using in-capillary derivatization with iodine

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