1 Application Scope
1.1 This standard specifies a silver diethyldithiocarbamate spectrophotometric method for the determination of arsenic in water and waste water.
Where the maximum volume of the sample is taken as 50mLsample, this method can be used to determine the sample with the upper limit concentration of 0.50mg/L arsenic content. By appropriate dilution of the test portion with arsenic-free water, higher concentration of arsenic may also be determined.
1.2 Minimum detection concentration
Where 50mL sample is taken, it may be detected that the arsenic content is 0.007 mg/L with 10mm cuvette.
1.3 Interference
Antimony and bismuth interferes determination (see Appendix A). However, when their concentration is up to 5mg/L, chromium, cobalt, copper, nickel, mercury, silver and platinum won't interfere the determination.
2 Definition
For the purpose of this standard, the following definition applies.
Total arsenic: the total amount of the element arsenic, in elementary form or bound in inorganic or organic compounds.
3 Principle
