催化极谱法测定水中痕量钼

Determination of Molybdenum in Water by Using Catalytic Polarography

摘要:

经HClO4蒸干水样去除水样中易挥发组分及有机物后，在以H2SO4扁桃酸NaClO3为混合底液的体系中，水样中钼(Ⅵ)与扁桃酸形成的络合物会与电极产生吸附现象，产生的吸附电流与浓度成正比，形成一个灵敏的单峰极谱催化波。借此可以定量测定钼(Ⅵ)含量。这种方法简便、准确，检出限为0.5μg/L，回收率在91.30%～103.65%，样品测定的相对标准偏差RSD=9.13%，测量结果与标准物质一致。

Abstract:

After dried with perchloric acid to get rid of the easy-volatile components and organic matter, in a base solution of sulfuric acid-mandelic acid-Sodium chlorat, the complex of Mo(Ⅵ) with mandelic acid showed a sensitive catalytic polarogrphic wave. Based on this fact, a method of catalytic polarogrphic for the determination of trace amount of Mo(Ⅵ) has been put forward. Good linearity was obtained between the peek heights and concentration of Mo(Ⅵ).The detection limit is 0.5μg/L, values of recovery are 91.30%～103.65%, the ralative standard deviation is 9.13% after 10 times test of standard materials. The analyzing results are accordance with standard values.