Abstract
Organo phosphorus compounds are decomposed by closed-flask combustion. The phosphate ions produced are then converted to phosphomolybdic acid and extracted withiso- butyl acetate. The 12molybdate ions associated with each original phosphate ion are spectrophotometrically determined by reactions with alkaline hydrogen peroxide, hydrogen peroxide and benzidine and gallic acid. The colours are measured at 450, 400 and 400nm respectively.
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