ISO/R 849:1968 PDF
Phosphoric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method
Phosphoric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 1 октября 1968 г.
- Издание:
- ISO OTHER 849 edition 1 version 1
- ICS:
- 71.060.30
Applicable to products having Fe contents of more than 0.001 % (m/m). Preliminary hydrolysis of polyphophate acids by prolonged boiling in the presence of hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)-2,2'-dipyridyl complex in the presence of ammonium acetate at pH of 3.1 and a temperature of 75 °C (under the test conditions the phosphate ions do not interfere). Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm.
Технические детали
- Технический комитет
- ISO/TC 47 - Chemistry
- SKU
- ISO/R 849:1968
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