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ISO 3707:1976

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Phosphoric acid for industrial use (including foodstuffs) — Determination of calcium content — Flame atomic absorption method
Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

01-02-2024

Language(s)

English, French

Published date

01-12-1976

Applicable to products having a Ca content of more than 50 mg/kg. Soluble SiO2 present in the solution at levels lower than 5 g/ml does not interfere. The principle consists in addition, to a hydrochloric acid solution of the test portion, of sodium ions to promote and stabilize the emission of calcium and of lanthanum ions to suppress the interference of aluminium. Specifies the aspiration of the solution into an acetylene-dinitrogen monoxide flame. Photometric measurement of the absorption of the 422.7-nm line emitted by a hollow- cathode calcium lamp. Has also been approved by the IUPAC.

Committee
ISO/TC 47
DevelopmentNote
Also numbered as BS 4258-8(1978) (08/2005)
DocumentType
Standard
Pages
4
ProductNote
THIS STANDARD ALSO REFERS TO ISO 847, ISO 849
PublisherName
International Organization for Standardization
Status
Withdrawn

Standards Relationship
NBN T 03 268 : 1980 Identical
NFT 20 480 : 79 FD Identical

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