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Methods of test for phosphoric acid (orthophosphoric acid) for industrial use -- Determination of oxides of nitrogen content
WITHDRAWN, 12/1/2011
Spectrophotometric measurement of the yellow-coloured nitrophenol, at a wavelength of about 435 nm, formed after permanganate oxidation of nitrous nitrogen to nitric nitrogen and reaction of the latter with 3,4-xylenol.
Applicable to products having an oxides of nitrogen content, expressed as nitrogen, equal to or greater than 0.2 mg/kg.
Also for use in the food industry.
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