A new very
sensitive and selective chromogenic reagents prepared by the reaction of Schiff
base with maleic anhydride (MA) and 1,4-butane (I), ethylene (II),
1,6-hexamethylene (III) and 1,2-propane diol (IV), respectively, were synthesized
and studied for the determination of trace lead in detail.
In 0.1molL−1 NaOH
medium, lead reacts with polyester to form a yellow complex, which gives a
maximum absorption at 462, 478, 482 and 495 nm using I, II, III and IV
respectively.
Beer’s law is
obeyed over the concentration ranges 0.04-1.20μgmL−1, whereas optimum
concentration ranges as adopted from Ringbom method was 0.10-1.05μgmL−1.
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