GB/T 6283-2008: Chemical products -- Determination of water Karl-Fischer method (general method)

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Scope

This Standard specifies a general method for the determination of the free or crystal
water content of a sample by the Karl • Fischer visual method and the coulometric
method.
This Standard is applicable to the determination of free or crystal water content in the
most organic and o inorganic solid, liquid chemical products.
This Standard is not applicable to the sample that can react with the main components
of Karl • Fischer Reagent and produce water; neither applicable to the determination
of water in sample that can reduce the iodine or oxidized iodide.
In some cases, the sample requires pretreatment measures, which shall be specified
in the corresponding national standards.
When there is no instrument for the coulometric method, the visual method can be
used; it is a direct titration, but only can used for the colorless solution. The coulometric
method includes direct titration and back titration methods. No matter which titration is
adopted, the result is more accurate; therefore, the coulometric method is
recommended to be used.

Basic Data

Standard ID	GB/T 6283-2008 (GB/T6283-2008)
Description (Translated English)	Chemical products -- Determination of water Karl-Fischer method (general method)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G04
Classification of International Standard	71.020; 71.040
Word Count Estimation	16,193
Date of Issue	2008-06-18
Date of Implementation	2009-02-01
Older Standard (superseded by this standard)	GB/T 6283-1986
Quoted Standard	GB/T 6682
Adopted Standard	ISO 760-1978, NEQ
Regulation (derived from)	National Standard Approval Announcement 2008 No.10 (Total No.123)
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 the determination of free samples of water or crystallization general method of water content by the Karl Fischer method and visual power law. This standard applies to the majority of organic and inorganic solids, liquid chemical products Determination of water content of free water or crystallization. This standard does not apply to react with the main component Karl Fischer reagent and production samples of water and energy reduction or oxidation of iodide iodine samples measured in water. In some cases, samples require pretreatment steps which are provided for in the respective national standards. When there is no electricity law instrument, you can use the visual method. It is a direct titration. But only for colorless solution. Electricity law, including direct titration and back-titration methods. Regardless of which are more accurate, and therefore, recommended power law.