Evaluation of Syringe‐Connected Minicolumn Technique for Preconcentration of Some Trace Elements Using Chromosorb‐103 and Determination by Flame Atomic Absorption Spectrometry

Abstract

Abstract A syringe‐connected minicolumn (SCM) technique has been developed for preconcentration and enrichment of cobalt, iron, and lead in river‐water samples prior to their determination by flame atomic absorption spectrometry (FAAS). The proposed technique is substituted for the classical batch and column techniques all of which are off‐line methods. The method proposed was compared with the column technique with respect to easiness, rapidness, simplicity and some analytic performances such as recovery, precision, accuracy and risk of contamination. The minicolumn was filled with Chromosorb‐103 as a sorbent. In order to retain the analyte elements, the sample solution was drawn into the syringe and discharged back passing through the sorbent in the minicolumn. The analyte elements were quantitatively retained at pH ≥4 if they were complexed with ammonium pyrrolidine dithiocarbamate (APDC) prior to passing through to the sorbent. The analytes sorbed on the minicolumn was then eluted with 1.0 mol L−1 HNO...