Arsenic colorimetry with silver diethyldithiocarbamate

Buděšínský, B.

doi:10.1016/0026-265x(79)90041-9

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…To our knowledge, no previous work has been published regarding the absorption characteristics obtained this way. Rather were the gases produced from precursors using specific reductants [15,26,30,36]. Sparging of AsH 3 under a nitrogen atmosphere resulted in the rapid formation of a deep red complex indicated by a broad absorption band with a maximum at 540 nm.…”

Section: Comparison Of Uv/vis-spectramentioning

confidence: 99%

“…It is the most popular spectrophotometric method [14] and dates back to the work of Vašák and Šedivec in 1952 [15]. Since then, it has been continuously refined and modified with regard to different sample matrices [16][17][18][19], optimisation of the chromophoric [17,20,21] and hydride generation methods [22][23][24], the identification of interferences [17,[25][26][27][28] and As speciation [29][30][31][32]. Ultimately, a performance comparable to inductively coupled plasma mass spectrometry [33] was achieved.…”

Section: Introductionmentioning

confidence: 99%

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Overestimation of geogenic arsenic in landfill leachate: interference of humic and phosphinic acid in a commercial test kit

Brück

Glatthaar

Weigand

2014

International Journal of Environmental Analytical Chemistry

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Large-scale groundwater contamination by arsenic (As) requires economical yet reliable analytical procedures to monitor the quality of well water and the effluent of As elimination processes. The silver diethyldithiocarbamate (AgDDTC) method provides the basis of a series of colourimetric tests used as a compromise between semi-quantitative field-test kits and expensive instrumental analytics. This study aimed at understanding the significant As overestimation by the AgDDTC method observed in landfill leachate samples. Results of the AgDDTC test were up to threefold the levels obtained by reference analyses. Overestimation broadly agreed with the time course of chemical oxygen demand and total phosphorus in the leachate. We hypothesised that the interference was caused by reduced P species or humic acid (HA), respectively. To test this, As-AgDDTC determinations from As standards were conducted with phosphonic (H 3 PO 3 ) and phosphinic acid (H 3 PO 2 ) as well as two commercial HA as matrix components. While H 3 PO 3 showed no effect, H 3 PO 2 in concentrations of 0.06 to 28 mg P L −1 yielded As recoveries of up to 130%. This was probably due to the evolution of phosphine (PH 3 ) as suggested by the absorption spectra recorded after reacting pure PH 3 with AgDDTC in pyridine. The HA in concentrations of 0.6-320 mg dissolved organic carbon L −1 gave As recoveries of up to 600%, possibly due to a chromophoric reaction of volatile HA digestion products formed during the reduction step. Significant As overestimation in the presence of the above-named compounds may require pre-oxidation of the samples. To recognise interference effects, the acquisition of full absorbance spectra may be recommendable in lieu of fixed wavelength analyses.

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Section: Comparison Of Uv/vis-spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overestimation of geogenic arsenic in landfill leachate: interference of humic and phosphinic acid in a commercial test kit

Brück

Glatthaar

Weigand

2014

International Journal of Environmental Analytical Chemistry

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“…In order to avoid the effect of these ions on the fluorescence intensity, ethylenediamine tetraacetic acid (EDTA) and thiourea were added for eliminating the influence of foreign ions on the fluorescence intensity of As(III) and total arsenic, respectively. Nitric acid has been reported to seriously affect the fluorescence signals, it could not be eliminated by ascorbic acid/thiourea, [34][35][36][37] so it is required to exhaust the nitric acid during the digestion procedure.…”

Section: Effect Of Foreign Ions On Fluorescence Signalsmentioning

confidence: 99%

Speciation Analysis of Arsenic in Traditional Chinese Medicines by Hydride Generation-Atomic Fluorescence Spectrometry

2003

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A method has been described for the determination of arsenic species (arsenite and arsenate) by hydride generation-atomic fluorescence spectrometry (HG-AFS). The experimental conditions that influence the fluorescence intensity and the reduction of arsenic were investigated and optimized, and the influences from foreign ions and their elimination were studied. The detection limit was found to be 79.7 ng L -1 . The proposed method was applied to the determination of arsenic species in water leachate of traditional Chinese medicines with a recovery range of 91.1 -109.5%.

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“…A most widely used spectrophotometric method of determination is the use of Ag-diethyldithiocarbamate which absorbs arsine (AsH 3 ) liberated from arsenic containing solution upon reduction using NaBH 4 . 4 However arsine is highly volatile and toxic if inhaled. Alternatively, photometric methods have also been reported for the sequential ow injection analysis (FIA) 5 .…”

Section: Introductionmentioning

confidence: 99%

Competent arsenicals: aqueous biphasic extractions and their application in nitrate/nitrite speciation

Samaddar

Sen

2013

RSC Adv.

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Arsenic colorimetry with silver diethyldithiocarbamate

Cited by 11 publications

References 12 publications

Overestimation of geogenic arsenic in landfill leachate: interference of humic and phosphinic acid in a commercial test kit

Overestimation of geogenic arsenic in landfill leachate: interference of humic and phosphinic acid in a commercial test kit

Speciation Analysis of Arsenic in Traditional Chinese Medicines by Hydride Generation-Atomic Fluorescence Spectrometry

Competent arsenicals: aqueous biphasic extractions and their application in nitrate/nitrite speciation

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