A method for the determination of combined nitrogen in tungsten metal powder, based on the dissolution of the sample in 30 per cent. w/v hydrogen peroxide, the hydrolysis of the nitrides and the fixation of nitrogen as ammonium salts in concentrated hydrochloric acid, has been developed. The coefficient of variation has been determined to be ±5·3 per cent. at the 75 p.p.m. and ±8 per cent. at the 30 p.p.m. level.
S. P. Awasthi, S. Sahasranaman and M. Sundaresan, Analyst, 1967, 92, 650 DOI: 10.1039/AN9679200650
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