Determination of osmium(VIII) in aqueous solution by d.c. argon plasma atomic emission spectrometry: interference studies

Abstract

The linear dynamic range, detection limits and precision of the determination of Os^VIII in 0.2 M NaOH or 2.0% HCl solutions by d.c. argon plasma atomic emission spectrometry were studied at four emission lines of osmium. The interference and matrix effects of HCl and HNO₃ and of cations Na, K, Mg, Ca, Al, Cr^VI, Fe^III, Co^II, Ni^II, Cu^II, Zn^II, Mo^VI Cd^II, Ru^III, Rh^III, Pd^II, Ag^I, Ir^III, Pt^IV and Au^III on the determination were investigated at the 225.585- and 290.906-nm emission lines. The linear range covered concentrations from 0.15 to 25 µg ml^– of Os^VIII. The detection limits were about 0.027 µg ml^–1 in 0.2 M NaOH and 0.030 µg ml^–1 in 2% HCl solutions, calculated from measurements of the blank.