Abstract
A new sensitive catalytic method for determining selenium(IV) is proposed. Selenium catalyzes the oxidation of p-hydrazinobenzenesulfonic acid to p-diazobenzenediazonium ion, which then is converted to a yellow azo dye by coupling with m-phenylenediamine. As little as 10 -7 M selenium(IV) can be determined easily; the effective molar absorptivity is 1.2 · 10 6 for selenium(IV). If the azo dye is extracted into an organic solvent, the effective molar absorptivity can be increased further to 2.4· 10 6 for selenium(IV).
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