Catalytic Kinetic Spectrophotometric Determination of Trace Amounts of Silver in Triton X-100 Micellar Medium

Autor:	Guohua Chang, Qin Wei, Bin Du, Jinhu Yang
Rok vydání:	2003
Předmět:	Substitution reaction Chromatography medicine.diagnostic_test Trace Amounts Potassium ferrocyanide Induction period Biochemistry (medical) Clinical Biochemistry Molar absorptivity Biochemistry Analytical Chemistry Catalysis chemistry.chemical_compound chemistry Spectrophotometry Triton X-100 Electrochemistry medicine Spectroscopy Nuclear chemistry
Zdroj:	Analytical Letters. 36:627-640
ISSN:	1532-236X 0003-2719
Popis:	A catalytic method has been developed for the determination of trace amounts of Ag+ in Triton X-100 micellar medium. The method is based on the catalytic effect of silver(I) on the rate of a ligand substitution reaction between potassium ferrocyanide and 4,7-biphenyl-1,10-phenanthroline (BPT). The reaction was followed spectrophotometrically at 536 nm by measuring the induction period. Beer's law was obeyed in the range of 0–0.040 µg/mL Ag+ and the apparent molar absorptivity was 2.43 × 106 L mol−1 cm−1. Both the influence of reaction variables and the interference of coexistent ions were studied. The proposed method has been applied to the wastewater samples with satisfactory results. The recoveries were between 93.2 and 107% and the RSD was below 4.0%.
Databáze:	OpenAIRE
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