AbstractA new method for indirect determination of cesium by single‐sweep oscillopolarography is presented. The method is based on the quantitative precipitation of cesium with tetraiodobismuthate(III) ion (BiI 4−); the BiI 4−ion can yield a well‐defined polarographic derivative wave at −0.24 V (vs. SCE) in acetic acid solution. The linear range for cesium was dependent on Bil 4−concentration. The detection limit was 10 μg. The procedure is simple, rapid, and convenient, and has been used to determine cesium in brine after extraction with large granular ammonium phosphomolybdate and BAMBP. The polarographic behavior and mechanism of reduction are investigated. The redox process appears to be irreversible and controlled by diffusion with adsorpti
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