ISO 2363:1972
$12.35
Sulphuric acid and oleums for industrial use — Determination of oxides of nitrogen — 2,4- Xylenol spectrophotometric method
| Published By | Publication Date | Number of Pages |
| ISO | 1972-11 | 6 |
The method ia applicable of oxide of nitrogen contents equal to or greater than 0,00002 % (m/m). The principle is based on oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate. Reaction of nitric nitrogen with 2,4-xylenol under specified conditions to form a nitrate derivate. Distillation of the nitrate derivate and absorption in sodium hydroxide solution. Spectrophotometric measurement of the yellow coloured nitrophenol at a wavelength of about 445 nm.
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