Journal
E-JOURNAL OF CHEMISTRY
Volume 8, Issue 1, Pages 435-442Publisher
HINDAWI LTD
DOI: 10.1155/2011/180476
Keywords
Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane; Silver ion; Cloud point extraction; Flame atomic absorption spectrometry
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Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane (BHIS) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of silver. The method is based on the extraction of silver at pH 8.0 by using non-ionic surfactant T-X114 and bis((1H-benzo[d] imidazol-2yl) methyl) sulfane as a chelating agent. The adopted concentrations for BHIS, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were optimized. Detection limits (3SDb/m) of 1.7 along with enrichment factor of 39 for silver ion was achieved. The high efficiency of cloud point extraction to carry out the determination of analytes in complex matrices was demonstrated. The proposed method was successfully applied to the ultra-trace determination of silver in real samples.
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