Abstract
A rapid and reproducible procedure is described for pre‐concentrating lead in drinking water. 10 ml of water sample is adjusted to alkaline pH and extracted with 5 ml of 0.01% dithizone in chloroform. Chloroform phase is then washed and evaporated to dryness. Dithizone chelated lead is re‐extracted into 2 ml of 5% HNO3 and analyzed by Perkin‐Elmer atomic absorption spectrometer (AAS). This typical extraction protocol results in a 5‐fold increase of AAS signals in samples as compared to direct sampling. The linearity of the procedure is excellent at the lead levels between 0 to 40 μg/L. Average recovery of lead in spiked water samples is 97%. Coefficient of variations of the procedure are 4.7% at 10 μg/L, 3.1% at 20 μg/L, and 2.7% at 30 μg/L for within‐day precision; 10.7% at 10 μg/L, 8.2% at 20 μg/L, and 4.1% at 30 μg/L for day‐to‐day precision. Comparing to other time consuming methods for concentrating lead in water samples, dithizone extraction provides a fast and simple alternative.
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