Abstract
Abstract A simple, rapid, precise and accurate method for the simultaneous determination of ppb levels of cadmium(II), nickel(II), cobalt(II), copper(II), bismuth(III) and mercury(II) in water was developed. The six heavy metals described above in 50 ml of water sample were quantitatively extracted into 1.0 ml of chloroform by shaking for 15 min as their hexamethylenedithiocarbamato chelates (HMDC chelates), then separated by reversed-phase high performance liquid chromatography (HPLC) and the eluted metal chelates were monitored at 260 nm. The six HMDC-metal chelates were successfully separated on a 5 μm ODS column (4.6 × 150 mm, Cosmosil 5 C18), using methyl alcohol-water-diethyl ether-buffer solution (NH4Cl-NH3, pH 7.5)-10−3M hexamethyleneammonium hexamethylenedithiocarbamate (HMA-HMDC)=82:9:3:3:3 as the eluent. The linear working curves for the six metals were obtained in the concentration range of 0.3–2000 ng/ml (ppb). Detection limits were 45–600 pg as metals. The recovery and the precision of the p...
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