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Synthesis of Bisarsenazo Type Reagents of Chromotropic Acid and Study on the Spectrophotometric Behaviors of Reaction of Reagents With Pb~(2+)

Nie Tianming(Juhua Group Corporation)  
In this article 8 new bisarsenazo type reagents of chromotropic acid have been synthesized. Their colour reactions with Pb(2+) have also been studied. The result is that reaction of these reagents and Pb(2+) have some certain sensitivity and choice. Normally the reaction is completed in weak acidic media. The color-appearnce is at instant and Pb-complexes are stable. Itsmaximum absorption lies at some 605 nm. The apparent absorption of coefficient is (2~3)× 104L. mol-1. cm-1. Usually Beer's law allows 0~150μg Pb/25 ml.
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