Trifluoperazine dihydrochloride as a new reagent for the spectrophotometric determination of osmium(VIII)

Abstract

Os(VIII) was detd. spectrophotometrically by measuring the absorbance of its 1:1 complex with trifluoperazine dihydrochloride at 502 nm (molar absorptivity 1.67 A� 104). The Sandell sensitivity was 0.0114 I¼g Os/cm2. The reproducibility was ±1.5%. Beer's law was obeyed for 0.2-5.6 I¼g Os/ml. Os 3 ppm can be detd. in the presence of 1000 ppm Zn, Mg, Ca, Ba, Sr, F-, Cl-, NO3-, sulfate, oxalate, acetate, and citrate; 200 ppm Ni, Co, Cu, UO22+, Br-, phosphate, CN-, and EDTA; 20 ppm Pt(IV), Rh(III), and Ir(III); and 3 ppm Ru(III) and Fe(III). Pd(II), Au, Ag, V(V), Ce(IV), dichromate, ClO4-, MnO4-, S2O32-, and I- interfered. The interferences of Fe, U, and Au can be masked by using phosphate, F-, and CN-. [on SciFinder(R)]