Reagents for Determinations of Trace Impurities in Water,Phase II.

摘要

Sensitive,specific,stable,water-soluble reagents are needed for rapid,spectrophotometric determinations of trace impurities in water. A new method for the determination of nitrate in water is described which uses zinc 1-naphthol-4-sulfonate,an easily prepared,readily purified,stable,water-soluble reagent;the reagent is much better than 1-napthol-4-sulfonic acid,which is satisfactory only under carefully controlled conditions. The same reagent,zinc 1-naphthol-4-sulfonate,also has been proposed for the rapid,specific,sensitive determination of nitrite in natural waters. Nitrite can be determined at ppm levels in the presence of several thousand fold excess of nitrate. The methods can be applied to such diverse systems as lakes where agricultural fertilizer run-off may be significant,to effluents from plants in the food-preparation industry,and to natural-water systems in highly mineralized areas.