Abstract
Traces of nickel, cobalt and copper are separated on chromatoplates and, after reaction with rubeanic acid, are determined quantitatively by diffuse reflectance spectroscopy ; 0.05 μg of the elements can be determined with a probable percentage error of 2 to 5%. Temperature stability, aging, and pH dependence of the chelates and chelating agents in the adsorbed state were investigated. The method is simple and could find routine application in geochemistry, food analysis, etc.
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