Determination of lead in water by preconcentration technique using ammonium pyrrolidine dithiocarbamate and dithizone.

In the present research work preconcentration technique is used for the determination of trace level of lead in drinking water samples. The two chelating agents ammonium pyrrolidine dithiocarbamate and dithizone were used for lead preconcentration. In flame atomic absorption spectrometric determination with a pre-concentration method, lead was reacted with ammonium pyrrolidine dithiocarbamate to make a complex which was further extracted into the methyl isobutyl ketone. This method made it possible to apply conventional flame atomic absorption spectrometry for the sensitive determination of trace amount of lead in water samples. In another method lead reacts with dithizone to form lead (II) dithizonate complex which is highly colored and thus serves as the basis for spectrophotometric determination of lead ions. These two methods are also compared statistically by comparing the calculated value of t with a critical value, using a paired t-test.