Abstract
Since nitrate could be a precarcinogen or a pretoxicant, several sensitive, reproducible manual methods for the determination of nitrate based on the coppercatalyzed reduction of nitrate to nitrite with hydrazine sulfate have been developed. Optimum conditions were obtained using sulfanilamide and N-(1-naphthyl)ethyl-enediamine dihydrochloride as the color-developing reagent. Two new and even more sensitive pairs of reagents for nitrate analysis are introduced that do not involve the use of a possibly carcinogenic naphthylamine. These were 4-amino-acetophenone and azulene or 8-anilino-1-naphthalenesulfonic acid.
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