ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Trace determination of heavy metals in the presence of excess zinc and cadmium ions. II. Effect of zinc and cadmium ions on the colorimetric determination of iron

J. Valcha

Forschungsinstitut für organische Synthesen in Pardubice-Rybitvi

Abstract: cf. C.A. 50, 14445c. The presence of Zn²⁺ and Cd²⁺ affects the detn. of Fe with dimethylglyoxime (I), ferron, and tiron. In the detn. with I a secondary red color was observed, the formation of which on the presence of Zn²⁺ and Cd²⁺. In the detn. with ferron the disturbing effect of traces of Cu was eliminated by Pb diethyldithiocarbamate. The presence of Zn²⁺  and Cd²⁺ was shown by a considerable decrease of the extinction coeff. In the detn. with tiron the shift of the wave length of max. extinction in the presence of larger amts. of both salts as well as their specific ion effect was observed. This method was modified by using 'const. addn.' which makes it possible to det. 10-8 g./ml. Fe³⁺ in the presence of Zn²⁺ and Cd²⁺.

Full paper in Portable Document Format: 119a548.pdf (in Czech)

Chemical Papers 11 (9) 548–557 (1957)