SCHEDULED MAINTENANCE
A distillation technique is described for the separation of traces of silicon (<100 p.p.m.) from niobium, tantalum, molybdenum and tungsten. The silicon is then determined colorimetrically by the molybdenum-blue method. The error in the results is not greater than ±5 p.p.m.
J. A. Stobart, Analyst, 1969, 94, 1142 DOI: 10.1039/AN9699401142
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