Separation and preconcentration of Pb(II) and Cu(II) ions via carrierelement-free coprecipitation using an acetohydrazide derivative

Abstract

A new method based on the combination of carrier element-free coprecipitation and ame atomic absorptionspectrometric determination has been investigated for simultaneous separation and preconcentration of Pb(II) and Cu(II)ions in some environmental solid and liquid samples. The 2-f3-(4-methylbenzyl)-4-[2-(1H-indol-3-yl)ethyl]-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-ylg-N\'-(phenylmethylene) acetohydrazide (MITA) was utilized as an organic coprecipitatingagent without using a carrier element for coprecipitation of the analyte ions. The effects of experimental conditionsincluding aqueous solution pH, MITA quantity, sample volume, standing time, and centrifugation rate and time wereinvestigated in detail and optimized. The in uences of some foreign ions were also evaluated on the quantitative recoveriesof the analyte ions. The preconcentration factors were 125 for both analyte ions. The detection limits were 1.32?gL1and 0.47?g L1for Pb(II) and Cu(II) ions, respectively, and the relative standard deviations (RSDs) were lowerthan 4% for both analyte ions. After the accuracy of the method was checked, it was applied to sea and stream wateras liquid samples and waste tea and tobacco as solid samples to determine the levels of Pb(II) and Cu(II) ions.