Concentration and spectrophotometric determination of zirconium(IV) during the analysis of rock using a chelating sorbent

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-1)-2′-oxi-3′,5′-dinitrobenzene, is described. The determination is not hindered by 6 ×10 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 Fe 3+ , Sc 3+ , and Y 3+ . Quantitative extraction of the element takes place in static conditions within the acidity range of 1 M HCl—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 %.