GB/T 7698-2014: Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method

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Scope

This standard specifies the method for the determination of carbonate content in sodium
hydroxide for industrial use.
This standard applies to products with a mass fraction of carbonate (expressed as
Na2CO3) greater than or equal to 0.02%.
Through the pre-test, the samples are divided into three categories:
a) Samples free of sulfides and chlorates.
b) Samples containing sulfides. This standard applies to products with a mass
fraction of sulfide (expressed as Na2S) less than 0.1%.
c) Samples containing chlorates. This standard applies to products with a mass
fraction of chlorate (expressed as NaClO3) less than 0.2%.
Due to the presence of interfering components in samples of types b) and c), the analysis
steps are modified appropriately (see Chapter 10).

Basic Data

Standard ID	GB/T 7698-2014 (GB/T7698-2014)
Description (Translated English)	Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G11
Classification of International Standard	71.060.40
Word Count Estimation	12,123
Date of Issue	9/3/2014
Date of Implementation	5/1/2015
Older Standard (superseded by this standard)	GB/T 7698-2003
Quoted Standard	GB/T 601; GB/T 603; GB/T 6682; GB/T 29643
Adopted Standard	ISO 3196-1975, MOD
Regulation (derived from)	People's Republic of China Announcement of Newly Approved National Standards No. 21 of 2014
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies Industrial sodium carbonate determination method used. This Standard is applicable to carbonate (Na2CO3 in dollars) of the mass fraction of greater than or equal to 0. 02% of the product. By pre-test, the sample is divided into thr