APPLICATION OF RAM HORN POWDER (RHP) FOR THE PRECONCENTRATION AND DETERMINATION OF COPPER IN VARIOUS SAMPLES BY FLAME ATOMIC ABSORPTION SPECTROMETRY

摘要

The use of ram horn powder (RHP) as a new sorbent for the preconcentration of copper(II) was proposed. The procedure is based on the adsorption of copper(II) ions as l-nitroso-2-naphthol-3,6-disulphonic acid chelate onto the mini column packed with RHP followed by the elution with 5 mL 1 M HC1 and determination by flame atomic absorption spectrometry (FAAS). The analytical variables, such as pH, eluent type, flow rate and sample volume were optimized and the analytical parameters, such as accuracy and limit of detection were studied. The optimum pH of the sample solution was found to be in a range of 4-8. The enrichment factor when using a sample volume of 500 mL was 100. The capacity of the sorbent was found to be 1.7 mg/g. The limit of detection for copper(H) was 0.42 μg/L. The accuracy of the method was confirmed by analyzing the lead base alloy and aluminum base alloy (NBS SRM 53e, NBS SRM 85b). The results demonstrated good agreement with the certified values. The procedure was applied to the determination of copper in aluminum foil and different waters, such as tap water, lake water, dam water and synthetic sea water samples.