1 Application Scope
1.1 Determination substance: this standard specifies determination of cadmium in water and waste water by spectrophotometric method with dithizone.
1.2 Sample type: this standard is applicable to determination of trace cadmium in natural water and waste water.
Relevant interference problem is detailed in Appendix A.
1.3 Scope: this method is applicable to determination of cadmium with the concentration range of 1~50μg/L; when concentration of cadmium is greater than 50μg/L, the sample is properly diluted before determination.
1.4 Detection limit: when the cuvette with optical path length of 20mm is used and the volume of the test portion is 100ml, the detection limit is 1μg/L.
1.5 Sensitivity: in this method, chloroform is used for extraction, when the measurement is carried out at the maximum light absorption wave length of 518nm, molar absorption coefficient is 8.56×104L/mol?cm.
2 Definition
As specified in this standard, total cadmium content in the water sample shall be determined after the water sample is subject to acid digestion treatment.
Contents
1 Application Scope
2 Definition
3 Principle
4 Reagent
5 Apparatus
6 Sampling and Sample
7 Procedures
8 Expression of Results
Appendix A (Supplement) Interfering Substance
Appendix B (Informative) General Explanation for This Standard
Additional Explanation
