Chemical reagent - General method for the determination of chloride
1 Scope
This standard specifies the general methods for the determination of chloride by visual turbidimetry.
This standard is applicable to the determination of micro chloride in chemical reagents. The determination range is 0.2 μg/mL ~ 4 μg/mL (in Cl).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition applies.
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity (GB/T 602-2002, ISO 6353-1: 1982, NEQ)
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods (GB/T 603-2002, ISO 6353-1: 1982, NEQ)
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-1992, neq ISO 3696: 1987)
3 Principle
In nitric acid medium, chloride ions and silver ions generate insoluble silver chloride. When chloride ion content is low, silver chloride is suspended in a certain period of time, which makes the solution turbid and can be used for visual turbidimetric determination of chloride.
