活性炭富集示波极谱法测定水中痕量钒

Preconcentration of Trace Vanadium in Water With Activated Carbon and Its Determination by Oscillopolarography

本文研究了钒在活性炭上的吸附行为和解吸附条件,建立了pH3～4条件下吸附,氢氧化钠溶液洗脱,示波极谱法测定水中痕量钒的方法。本法富集倍数为100,对水样的最小检出浓度为0.05μg/L,加标回收率为87.4％～100.3％,7份平行样品测定的相对标准偏差为3.5％～12.8％。

The adsorption and desorption behavior of vanadium on activated carbon was studied. Trace vanadium in water could be adsorbed on activated carbon at pH 3-4, then elut-ed with 0.5 mol/L sodium hydroxide and determined by oscillopolarography. The content of vanadium could be concentrated by 100 times. The relative standard deviation of 7 parallel determinations was 3.5%-12. 8%. The proposed method has been applied to the determination of trace vanadium in natural waters with the recovery of 87.4%-100.3%, and with the detection limit of 0. 05μg/L