Methods for chemical analysis of iron steel and alloy; The neocuproine-chloroform extraction photometric method for the determination of copper content
1 Subject Content and Application Scope
This standard specifies the determination of copper content with the neocuproine-chloroform extraction photometric method.
This standard is applicable to determination of copper content in the pig iron, carbon steel, alloy steel, high temperature alloy and precious alloy. Determination range: 0.010% ~1.00%.
2 Method Summary
Dissolve sample with acid, reduce copper into univalence with hydroxylamine hydrochloride if citric acid is available, in the range of pH 5~6, neocuproine and copper produce the 2:1 insoluble yellow complex compound, extract it with chloroform, and measure its absorbance. Chromium has negative interference if it is larger than 4mg in the extraction solution and other common coexisting elements all are free from interference.
1 Subject Content and Application Scope
2 Method Summary
3 Reagents
4 Analytical Procedure
5 Calculation of Analytical Result
6 Precision
Additional Explanation
