1 Subject Content and Applicable Scope
This standard specifies the determination of trace amount of arsenic in surface water, underground water and drinking water by spectrophotometric method with new salt. 250ml specimen and 3.00ml absorption solution is taken and 10mm cuvette is used. The minimum detectable concentration of this method is 0.4μg/L and the upper limit of determination is 12μg/L.
2 Principle
Potassium borohydride (or sodium borohydride) generates nascent hydrogen in the acid solution and makes the arsenic in specimen transformed into arsenic-hydrogen; the nitric acid-silver nitrate-polyvinyl alcohol-ethanol solution is taken as the absorption solution and makes the silver ion reduced to elemental silver and solution act like yellow. The absorbance is measured at 400nm place.
The chemical equation is as follows:
+H++3H2O→8[H]+H3BO3
2As3++6[H]→2AsH3↑
6Ag+AsH3+3H2O→6Ag+H3AsO3+6H+
3 Reagent
Contents
1 Subject Content and Applicable Scope
2 Principle
3 Reagent
4 Apparatus
5 Sample
6 Procedure
7 Result Expression
8 Precision and Accuracy
Appendix A (Supplement) Sample Digestion Pretreatment
Appendix B (Informative) General Explanation
Additional Explanation
Standard
GB 11900-1989 Water quality-Determination of trace amounts of arsenic-Borohydride potassium-nitrale silver spectrophotometric method (English Version)
Standard No.
GB 11900-1989
Status
valid
Language
English
File Format
PDF
Word Count
3000 words
Price(USD)
60.0
Implemented on
1990-7-1
Delivery
via email in 1 business day
Detail of GB 11900-1989
Standard No.
GB 11900-1989
English Name
Water quality-Determination of trace amounts of arsenic-Borohydride potassium-nitrale silver spectrophotometric method
1 Subject Content and Applicable Scope
This standard specifies the determination of trace amount of arsenic in surface water, underground water and drinking water by spectrophotometric method with new salt. 250ml specimen and 3.00ml absorption solution is taken and 10mm cuvette is used. The minimum detectable concentration of this method is 0.4μg/L and the upper limit of determination is 12μg/L.
2 Principle
Potassium borohydride (or sodium borohydride) generates nascent hydrogen in the acid solution and makes the arsenic in specimen transformed into arsenic-hydrogen; the nitric acid-silver nitrate-polyvinyl alcohol-ethanol solution is taken as the absorption solution and makes the silver ion reduced to elemental silver and solution act like yellow. The absorbance is measured at 400nm place.
The chemical equation is as follows:
+H++3H2O→8[H]+H3BO3
2As3++6[H]→2AsH3↑
6Ag+AsH3+3H2O→6Ag+H3AsO3+6H+
3 Reagent
Contents of GB 11900-1989
Contents
1 Subject Content and Applicable Scope
2 Principle
3 Reagent
4 Apparatus
5 Sample
6 Procedure
7 Result Expression
8 Precision and Accuracy
Appendix A (Supplement) Sample Digestion Pretreatment
Appendix B (Informative) General Explanation
Additional Explanation
