催化极谱法测定二氧化锰中微量钼

Determination of Trace Molybdenum in Manganese Dioxide by Catalytic Polarograph

钼在0.25mol/L硫酸、0.056mol/L苯羟乙酸、0.245mol/L氯酸钾底液中产生一灵敏的单峰催化波,峰电位在—0.23V(对饱和甘汞电极)。在0.01～1.0μgMo/25ml范围内,其浓度与波高成线性关系,本文研究了催化波的行为并用于二氧化锰中痕量钼的测定。二氧化锰中的杂质离子不干扰测定。

In a solution of 0.25 mol/1 sulfuric acid.0.056 mol/1 phenylhydroxyacelic acid and 0.245 mol/l potassium chlorate a sensitive catalytic wave of Mo has been attained by using single-sweep polarograph at -0.23V(vs SCE). It showed that the peak of the wave was directly proportional to the concentration of Mo in the range from 0. 01 to 1.0μg/25ml the behavior of the catalytic wave was studied and this method was successfully applied to determine trace amounts of Mo in manganese dioxide. The interference ions in mangnese dioxide had no effect on the determination results.