title: Trace enrichment and determination of silver by immobilized DDTC microcolumn and flow injection atomic absorption spectrometry.
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.
authors.affiliation: Department of Chemistry, Yazd University, Yazd 89195-741, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Dadfarnia
authors.forename: A M
authors.initials: AM
authors.lastname: Haji Shabani
authors.forename: M
authors.initials: M
authors.lastname: Gohari