ISO 3709:1976
Phosphoric acid for industrial use (including foodstuffs) — Determination of oxides of nitrogen content — 3,4- Xylenol spectrophotometric method
OVERVIEW
Applicable to products having a content, expressed as N, equal to or more than 0.2 mg/kg. Consists in oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate and reaction of nitrogen(V) with 3,4-xylenol under specified conditions to form a nitrate derivative. Subsequent destillation of the nitrate derivative and absorption in sodium hydroxide solution. Spectrophotometric measurement of the yellow nitrophenol at a wavelength of about 435 nm.
COMMENTS
-
PRODUCT DETAILS
| Status | Withdrawn - 03 Jan 2024 |
|---|---|
| Edition | 1976 |
| No. of Pages | 4 |
| ICS Classification | 71.060.30 Acids 67.220.20 Food additives |
| Committee | ISO/TC 47 |
| Available for Purchase | For sale in Singapore only |
| Adoption | ISO |