Polarographic determination of osmium with the osmium(VIII)-cerium(IV)-arsenic(III) system.
A highly sensitive and novel polarographic method has been developed for determination of ultratrace amounts of osmium, based on the catalysis of the cerium(IV)-arsenic(III) reaction by osmium(VIII). The reaction rate is monitored by measuring the arsenic(III) with a single-sweep oscillopolarograph. Osmium concentrations from 7.0 x 10(-11) to 5.0 x 10(-9)M can be determined by the initial rate method. The method has been applied to determination of osmium in refined ore and chlorination residues with satisfactory results.
Zhi-Liang
J
J
Laboratory of Instrumental Analysis, Department of Chemistry, Guangxi Normal University, Guilin, People's Republic of China.
Ai-Hui
L
L