Concentration and Spectrophotometric Determination of Zirconium(IV) during the Analysis of Rock Using a Chelating Sorbent

摘要

The technique of spectrophotometric determination of Zr(IV) in rock based on preliminary individual extraction (concentration) of this element by a polymer chelating sorbent, namely, polystyrene-2-oxi-(azo-l)-2'-oxi-3',5'-dinitrobenzene, is described. The determination is not hindered by 6 × l0~4-fold mass amounts of Na~+, K~+, Ca~(2+), Mg~(2+), Ba~(2+), and Sr~(2+); 2 × 10~4-fold mass amounts of Al~(3+), Cu~(2+), Pb~(2+), Co~(2+), Ni~(2+), Zn~(2+), and Cd~(2+); 5 × 10~3-fold mass amounts of Sn~(2+), Fe~(2+), Be~(2+), and Ce~(3+); and 2 × 10~3-fold mass amounts of Fe3+, Sc3+, and Y3+. Quantitative extraction of the element takes place in static conditions within the acidity range of 1 M HC1-2.5 pH. The correctness of the technique was tested by the analysis of standard rock specimens. The relative standard deviation is 0.01-0.04 during determination of Zr(IV) at the concentration level of n × 10~(-2)-n × 10~(-4)%.