Abstract
The optimum conditions for the preconcentration of nickel, zinc, cobalt, and copper on a Silochrom C-120 silica modified with 4-(2-thiazolylazo)resorcinol were found. Chromaticity characteristics of the metal chelates were determined. It was shown that nickel and zinc chelates meet the requirements of the separate determination. A method for the separate determination of 0.05-1 Μg/mL of nickel and 0.15-5 Μg/mL of zinc based on chromaticity measurements was proposed. Procedures for determining zinc, nickel, and cobalt in soils were developed.
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