It is proved that the optimum condition is 5 cm of cadmium column height,9.15-9.78 of ammoniacal buffer pH and 2-3 times of content of cadmium column of washing drip. The deoxidization efficiency and recovery rate are satisfying.

• 结果表明；当镉柱高度为5 cm；氨缓冲溶液pH 9.；15-9