GB 7469-1987 Water quality-Determination of total mercury-potassium permanganats-potassium persalfate decomposed method-Dithizonc spectrophotometric method (English Version)
Total mercury: mercury concentration in unfiltered water sample determined through fierce decomposition, including inorganic, organically combined, soluble and suspended all mercury (Hg).
2 Principle
Potassium permanganate and potassium persalfate are used to decompose the sample at 95℃, and all mercury contained is transformed to mercury (II).
The excessive oxidizer is reduced with hydroxylamine hydrochloride, and under acidic condition, mercury ion will react with dithizone to generate orange chelate, it will be extracted with organic solvent and then the excessive dithizone is washed away with alkali solution.
Contents 1 Definition 2 Principle 3 Reagent 4 Apparatus 5 Sampling and Sample 6 Procedures 7 Result Expression Appendix A (Informative) General Explanation Additional Explanation
GB 7469-1987 Water quality-Determination of total mercury-potassium permanganats-potassium persalfate decomposed method-Dithizonc spectrophotometric method (English Version)
Standard No.
GB 7469-1987
Status
valid
Language
English
File Format
PDF
Word Count
3000 words
Price(USD)
60.0
Implemented on
1987-8-1
Delivery
via email in 1 business day
Detail of GB 7469-1987
Standard No.
GB 7469-1987
English Name
Water quality-Determination of total mercury-potassium permanganats-potassium persalfate decomposed method-Dithizonc spectrophotometric method
1 Definition
Total mercury: mercury concentration in unfiltered water sample determined through fierce decomposition, including inorganic, organically combined, soluble and suspended all mercury (Hg).
2 Principle
Potassium permanganate and potassium persalfate are used to decompose the sample at 95℃, and all mercury contained is transformed to mercury (II).
The excessive oxidizer is reduced with hydroxylamine hydrochloride, and under acidic condition, mercury ion will react with dithizone to generate orange chelate, it will be extracted with organic solvent and then the excessive dithizone is washed away with alkali solution.
Contents of GB 7469-1987
Contents
1 Definition
2 Principle
3 Reagent
4 Apparatus
5 Sampling and Sample
6 Procedures
7 Result Expression
Appendix A (Informative) General Explanation
Additional Explanation
