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

Abstract

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%.

Keywords:

• Silver determination
• Catalytic method
• Kinetics
• Spectrophotometry
• Triton X-100 micellar solution

Acknowledgments

The comments of the unknown reviews is greatly helpful. Financial support from Shandong Provincial Natural Science Foundation is gratefully acknowledged.