Preparation of a Chelating Resin and its Application as a Preconcentration System for Determination of Cadmium in River Water by Flow Injection Analysis

Document Type: Original Research Paper

Authors

1 1Analytical Chemistry Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung - 40132, Indonesia

2 Department of Chemistry, University of Mulawarman, Samarinda, Indonesia

Abstract

A chelating resin of polystyrene divinylbenzene resin functionalized by 1-(2-pyridylazo) 2-
naphtol (PSDVB-PAN) has been synthesized and its sorption properties have been investigated for preconcentration
and determination of cadmium at μg/L level by flame atomic absorption spectrometry. The
procedure is based on the sorption of Cd(II) ions on a minicolumn of synthesized chelating resin. The retained
cadmium ions can be quickly eluted from sorbent material, with the eluent stream consisting of nitric acid
solution, directly to the nebulizer burner system of the flame atomic absorption spectrometer. The sorption
capacity of PSDVB-PAN was found to be 7.5 mg/g at optimum pH and the chelating resin showed rapid
kinetic sorption. The sorption equilibrium of Cd(II) on synthesized chelating resin was achieved just in 15
minutes. Parameters such as the pH effect on the cadmium sorption, sample volume, the sorption capacity of
resin, the cadmium desorption from the resin and the analytical characteristics of the procedure were studied
for the quantitative recoveries of the analyte ions. The developed system allowed a throughput rate of 15
samples h-1 with a detection limit of 1.5 μg/L. Relative standard deviation for 5 replicated injections of 50 μg/
L was 1.8%. This procedure was applied for cadmium determination in river water samples collected from
Citarum River, West Java, Indonesia.

Keywords