US EPA

446393 

Journal Article 

Cloud point extraction and preconcentration of silver and cadmium using Schiff base prior to flame atomic absorption spectrometric determination 

Abkenar, SHD; Hosseini, M; Salavati-Niasari, M 

2008 

Yes 

Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 

20 

6 

4291-4300 

English 

WOS:000259602700023 

Cloud point methodology was successfully used for the extraction of trace amounts of silver and cadmium as a prior step to their determination by flame atomic absorption spectrometry. Silver and cadmium reacts with Schiff base benzylbis(thiosemicarbazone) as chelating agent in a surfactant solution yielding a hydrophobic complex, which then is entrapped in surfactant micelles. After phase separation, based on the cloud point the mixture and dilution of the surfactant-rich phase with methanol containing 0.1 M HNO3, the enriched analytes were determined by flame atomic absorption spectrometry. After optimization of the complexation and extraction conditions and preconcentration 60 mL of sample in the presence of 0.17% Triton-X-114 the enhancement factors of 140 and 60 and detection limits of 0.04 ng mL-(1) and 0.08 ng mL(-1) were obtained for silver and cadmium, respectively. The proposed method was applied satisfactory to the determination of Ag and Cd in natural water samples. 

cloud point extraction; silver; cadmium; preconcentration; water samples; trace amounts; separation; speciation; chromium; copper; lead