ISO 984:1974

$12.35

Sodium hydroxide for industrial use — Determination of silica content — Reduced silico-molybdic complex photometric method

Published By	Publication Date	Number of Pages
ISO	1974-12	5

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Categories: 71.060.40 - Bases, ISO

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Description

The method is applicable to products having silica contents exceeding 10 mg/kg. The principle is based on the formation of yellow oxidized silico-molybdic complex in a strongly acid medium, in the presence of boric acid to suppress interference by fluorides. Selective reduction of this complex with a mixture of aminonaphtholsulphonic acid (4-amino-3-hydroxynaphthalene-1-sulphonic acid), sodium metabisulphite and sodium sulphite, in the presence of oxalic acid and in a strongly acid medium so as to suppress interference by phosphates. Photometric measurement of the blue-coloured complex at a wavelength of about 795 nm.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1974-12
Pages Count	5
Language	English
Edition	1
File Size	276.5 KB
ICS Codes	71.060.40 - Bases

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ISO 984:1974

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