ISO 3709:1976 PDF
Phosphoric acid for industrial use (including foodstuffs) — Determination of oxides of nitrogen content — 3,4- Xylenol spectrophotometric method
Open preview (PDF)Phosphoric acid for industrial use (including foodstuffs) — Determination of oxides of nitrogen content — 3,4- Xylenol spectrophotometric methodPhosphoric acid for industrial use (including foodstuffs) — Determination of oxides of nitrogen content — 3,4- Xylenol spectrophotometric method
- Document status:
- Withdrawn
- Format:
- Electronic (PDF)
- Number of pages:
- 4
- Publication date:
- November 1, 1976
- Edition:
- ISO IS 3709 edition 1 version 1
- ICS:
- 67.220.20
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.
Technical details
- Technical committee
- ISO/TC 47 - Chemistry
- SKU
- ISO 3709:1976
