Reference number
ISO 4325:1990
ISO 4325:1990
© ISO 2024
International Standard
ISO 4325:1990
Soaps and detergents — Determination of chelating agent content — Titrimetric method
Edition 2
1990-04
1990-04
ISO 4325:1990
10198
Published
(Edition 2, 1990)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
A test portion of the sample is dissolved in water, the pH of the solution adjusted to 4.65 and the solution titrated against standard copper(II) sulphate solution using 1-(2-pyridylazo)-2-naphthol as indicator. Principally the method has been designed principally for determining ethylenediaminetetraacetic acid (EDTA) and it salts. Before determining other chelating agents, or determining ethylenediaminetetraacetic acid in the presence of other chelating agents, the applicability of the method should be confirmed.
Life cycle
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Previously
WithdrawnISO 4325:1977
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Now