氰化浸出液样品用0.45 μm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 AS11 (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-1 of 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 RSD′s (n=7) less than 2.5%.