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The facile flow-injection spectrophotometric detection of gold(III) in water and pharmaceutical samples using ... article from: Journal of Hazardous Materials]
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This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A simple, sensitive and rapid flow-injection spectrophotometric method was developed for the determination of trace amounts of Au(III) in aqueous dimethylformamide (DMF). The method is based on formation of Au(III)-(3,5-DMHAAINH)"3 complex. The optimum conditions for the chromogenic reaction of Au(III) with 3,5-DMHAAINH is studied and the colored (reddish brown) complex is selectively monitored at @l"m"a"x 490nm at pH 6.0. The reaction and flow conditions of the full experimental design were optimized. The detection limit (2s) of 0.1@mgl^-^1 Au(III) was obtained at a sampling rate of 15 samples h^-^1. Beer's law is obeyed over the range of 0.30-4.00@mgml^-^1. The molar absorptivity and Sandell's sensitivity were 3.450x10^4M and 0.0050@mgml^-^1, respectively. Job's method of continuous variation and stability constants corresponding to these maxima was determined and found to be 9.3x10^1^5 (1:3, M:R) (M, metal; R, reagent). The detailed study of various interferences confirmed the high selectivity of the developed method. The method was successfully applied for the determination of trace amount of Au(III) in water and pharmaceutical samples. The results obtained were in agreement with the reported methods at the 95% confidence level.
Description:
A simple, sensitive and rapid flow-injection spectrophotometric method was developed for the determination of trace amounts of Au(III) in aqueous dimethylformamide (DMF). The method is based on formation of Au(III)-(3,5-DMHAAINH)"3 complex. The optimum conditions for the chromogenic reaction of Au(III) with 3,5-DMHAAINH is studied and the colored (reddish brown) complex is selectively monitored at @l"m"a"x 490nm at pH 6.0. The reaction and flow conditions of the full experimental design were optimized. The detection limit (2s) of 0.1@mgl^-^1 Au(III) was obtained at a sampling rate of 15 samples h^-^1. Beer's law is obeyed over the range of 0.30-4.00@mgml^-^1. The molar absorptivity and Sandell's sensitivity were 3.450x10^4M and 0.0050@mgml^-^1, respectively. Job's method of continuous variation and stability constants corresponding to these maxima was determined and found to be 9.3x10^1^5 (1:3, M:R) (M, metal; R, reagent). The detailed study of various interferences confirmed the high selectivity of the developed method. The method was successfully applied for the determination of trace amount of Au(III) in water and pharmaceutical samples. The results obtained were in agreement with the reported methods at the 95% confidence level.
