离子色谱法测定氰化浸出液中金、银、铜、铁、钴、镍和锌的含量

IC Determination of Au,Ag,Cu,Fe,Co,Ni and Zn in Cyanide Leachate

氰化浸出液样品用0.45μm针头过滤器过滤,用离子色谱法测定氰化浸出液中金、银、铜、铁、钴、镍和锌等7种元素的含量。以IonPae AS11阴离子交换柱(2.0 mm×250 mm)为固定相,含0.02 mol·L^(-1)氢氧化钠和0.01 mol·L^(-1)氰化钠溶液作为流动相,于波长210 nm处进行紫外检测。7种金属的氰化物络阴离子在30 min内可完全分离。各元素的检出限(3S/N)在0.01～0.08 mg·L^(-1)之间。方法的加标回收率为94.0%～104%,测定值的相对标准偏差(n=7)均小于2.5%。

Sample of the cyanide leachate was filtrated with 0. 45 μm pinhead filter, and the contents of 7 metal elements including Au, Ag, Cu, Fe, Co, Ni and Zn in the filtrate were determined by ion chromatography （IC）. IonPae ASll （2. 0 mm× 250 mm） ion chromatographic column was used as stationary phase and a mixed solution containing 0. 02 mol·L^-1 of NaOH and 0. 01 mol·L^-1of NaCN was used as mobile phase. The anionic complexes of the 7 metal cations were completely separated within 30 min. Values of detection limit （3S/N） were found in the range of 0.01-0. 08 mg·L^-1 . Tests for recovery and precision were made, giving values of recovery ranged from 94.0%-104%, and of RSDrs （n=7） less than 2.5%.