S. Dadfarnia, A. Shabani, M. Gohari
Oct 20, 2004
Citations
0
Influential Citations
131
Citations
Quality indicators
Journal
Talanta
Abstract
Flow injection (FI) system incorporating a microcolumn of immobilized diethyldithiocarbamate (DDTC) on surfactant-coated alumina was combined with atomic absorption spectrometry for on-line trace enrichment and determination of silver in different matrices. Silver was deposited on the microcolumn by processing a standard or solution of analyte at pH 3-4 on the column. Injection of 250mul of ethanol then served to elute the retained species to atomic absorption spectrometry (AAS). A sample volume of 20ml resulted in a pre-concentration factor of 125, and precision at the 20mugl(-1) was 4% (R.S.D.). The procedure was applied to tap water, well water, rain water, sea water, radiology film, and lead concentrate samples. The accuracy was assessed through recovery experiments, independent analysis by furnace-AAS, and analysis of certified reference material.