悬汞电极阴极溶出伏安法测定海水中的Se^(4+)在粉煤灰倾倒海中溶出物的应用

CATHODE STRIPPING VOLTAMMETH WITH HANGING-MERCURY IN DETERMINATION OF DISSOLVED Se^(4+) IN SEAWATER FROM FINE COAL ASH DUMPING

本方法采用电位在.025V,富集3min,静止15s,以5mV/s速率扫描的阴极溶出伏安法测定粉煤灰在海水中溶出的Se^(4+),检出限0.05μg/L。在海水中Se^(4+)含量1～3.5μg/L,加入标准Se^(4+)2μg/L,其回收率在93.5％～109％之间。因此,本方法在海洋倾废监测中是测定海水中Se^(4+)的快速简便的方法。

In determing dissolved Se4+ in seawater from the fine coal ash dumping, stripping voltammeth experiments were carried out at 0. 25 Vand sweep rate 5 mV/s. The preconcen-tration time was 3 min. Recovery was between 93. 5 -109%. The detection limit was about 0. 05 μg/L for a preconcentration time 0. 3 min.