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Abstract
A sensitive and simple method for online simultaneous preconcentration of trace heavy metal ions in some of the environmental samples by flame atomic absorption spectrometry has been reported. In present study ammonium lauryl sulphate is used as a new surfactant for modification of alumina with dithizone as a adsorbent for simultaneous preconcentration of Cd, Cu, Ni and Zn. The adsorbed metals on modified alumina were eluted using 1 mL of 1 mol L-1 hydrochloric acid. The influences of the analytical parameters including pH, flow rate of sample, type and volume of eluent and sample volume were investigated. The calibration curve was linear in the range of 0.05–0.5 μg mL-1 for Cd, Cu, Ni and Zn. The limits of detection were 1, 0.5, 1.1 and 0.61 ng mL-1 for Cd, Cu, Ni and Zn respectively. The preconcentration factor of 100 for Cu and 150 for Cd, Ni and Zn was achieved. The developed method was successfully applied for the determination of trace metal ions in soil, water and plant samples.