GB/T 11213.3-2003 《Sodium hydroxide for chemical fiber use--Determination of the calcium content--EDTA complexometric method》 Related products
This standard specifies a method for the determination of calcium content in sodiumhydrate, applicable to products with a calcium mass fraction greater than or equal to 0.0005%. The method uses disodium ethylenediaminetetraacetate (EDTA) as a complexing agent and is titrated with the help of glyoxal acetal bis (2 hydroxyaniline, GBHA) as an indicator. During the test, when the pH value is 12, EDTA forms a stable complex with calcium ions, causing the indicator to change from red to yellow, indicating the titration endpoint. This method ensures accurate determination of calcium content.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active |
|---|---|
| CCS | G11 | ICS | 71.060.40 |
| Release Date | 2003-08-25 00:00:00 | Implementation Date | 2004-02-01 00:00:00 |
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Extended reading
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