Dithiocarbamate functionalized or surface sorbed merrifield resin beads as column materials for on line flow injection – flame atomic absorption spectrometry determination of lead

Abstract

This article describes the preparation of dithiocarbamate immobilzed / functionalized and diethylammonium dithiocarbamate (DDTC) sorbed Merrifield Chloromethylated Resin (MCR) beads and comparison of these materials for on-ine flow injection (FI) - flame atomic absorption spectrometry (FAAS) determination of lead. The above two materials enrich lead quantitatively over an identical optimal pH range (8.0 - 9.0), a preconcentration/loading time (up to 4 min) and elution with acidified methanol (a minimum of 0.01 mol L rise to-1 HNO3 in methanol). However, the detection limit for lead using dithiocarbamate functionalized MCR beads is 1.3Mu gL-1 compared to 3Mu gL rise to -1 for DDTC sorbed MCR beads. Again, the sensitivity enhancement over direct GAAS signal is 48- and 27- fold respectively. In addition, dithiocarbamate functionalized MCR beads offers better preision compared to DDTC sorbed MCR beads as the corresponding relative standard deviation (R.S.D.) values for five successive determinations of 0.20 Mu gmLrise to -1 are 1.44 and 4.36% respectively. The accuracy of the developed on-line FI-FAAS procedure employing dithiocarbamate functionalized MCR beads as column material was tested by analyzing certified Reference Material (CRM) of soil (IAEA soil-7) and marine sediment reference material (MESS-3) supplied by international Atomic Energy Agency (IAEA), Vienna and National Research Council (NRC), Canada, respectively. Furthermore, the developed procedure has been successfully tested for the analysis of surface, pond, ground and effluent water and soil samples collected from the vicinity of lead acid battery industry in India.