Methods of test for phosphoric acid (orthophosphoric acid) for industrial use. Determination of oxides of nitrogen content

Published by	Publication Date	Number of Pages
BSI	01/31/1978	8

Category: BS

Description

BS 4258-10 – Methods of test for phosphoric acid (orthophosphoric acid) for industrial use. Determination of oxides of nitrogen content

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.

Cross References:
BS 3978
BS 4258:Part 1
BS 4258:Part 2
BS 4258:Part 3
BS 4258:Part 4
BS 4258:Part 5
BS 4258:Part 6
BS 4258:Part 7
BS 4258:Part 8
BS 4258:Part 9
BS 4258:Part 11
ISO/R 847