Abstract
A new method for the determination of nitrate has been worked out. ( a) Nitrate ions can be reduced to ammonia in acidic medium by means of ferrum reductum in the presence of nickel sulphate. Ammonia can be precipitated in acidic medium as ammonium tetraphenylboron. After filtering and washing, the precipitate can be dissolved in acetone and the solution can be titrated with silver nitrate with Variamin Blue acetate as indicator. ( b) Nitrate ions can be reduced in alkaline medium with Devarda's alloy, the ammonia being distilled and titrated as described above. This method has been applied to the determination of nitrates accompanied by organic material, and of nitrozo, azo and diazo compounds.
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