کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1246541 | 969758 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synergistic liquid-liquid extractive spectrophotometric determination of gold(III) using 1-(2â²,4â²-dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Synergistic liquid-liquid extractive spectrophotometric determination of gold(III) using 1-(2â²,4â²-dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydro pyrimidine-2-thiol [2â²,4â²-dinitro APTPT] has been described. Equal volumes (5 cm3) of the 2â²,4â²-dinitro APTPT (0.02 mol Lâ1) in the presence of pyridine (0.5 mol Lâ1) form an orange-red coloured ternary complex with gold(III) of molar ratio 1:1:1 at pH 1.8-2.4 with 5 min of shaking. The absorbance of coloured organic layer in 1,2-dichloroethane is measured spectrophotometrically at 445 nm against reagent blank. A pronounced synergism has been observed by the binary mixture of 2â²,4â²-dinitro APTPT and pyridine, which shows that the enhancement in the absorbance is observed in the presence of pyridine by the adduct formation in the organic phase. Beer's law was obeyed in the concentration range 2.5-20.0 μg mLâ1, with molar absorptivity and Sandell's sensitivity values of 8.7 Ã 103 dm3 molâ1 cmâ1 and 0.023 μg cmâ2 respectively. A repetition of the method was checked by finding relative standard deviation (R.S.D.) (n = 10) which was 0.17%. The composition of the gold(III)-2â²,4â²-dinitro APTPT-pyridine adduct was established by slope analysis, molar ratio and Job's method. The ternary complex was stable for more than 48 h. The influence of various factors such as pH, 2â²,4â²-dinitro APTPT concentration, solvent and pyridine on the degree of complexation has been established. A number of foreign ions tested for their interferences and use of suitable masking agents wherever necessary are tabulated, which show that selectivity of the method has been enhanced. The method is successfully employed for the determination of gold(III) in binary, synthetic mixtures and ayurvedic samples. The reliability of the method is assured by inter-comparison of experimental values, using an atomic absorption spectrometer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 81, Issue 3, 15 May 2010, Pages 1088-1095
Journal: Talanta - Volume 81, Issue 3, 15 May 2010, Pages 1088-1095
نویسندگان
Ganesh S. Kamble, Sanjay S. Kolekar, Sung. H. Han, Mansing A. Anuse,