研究了以咪唑为背景吸收电解质，α羟基异丁酸为络合剂，毛细管离子电泳分离，间接紫外光度法测定镍矿石中Ｎｉ、Ｃｏ、Ｃｕ含量。考察了背景电解质的ｐＨ值、α羟基异丁酸（αＨＩＢＡ）和咪唑浓度对Ｆｅ３＋、Ｃｏ２＋、Ｎｉ２＋、Ｚｎ２＋、Ｃｕ２＋分离的影响。在优化的条件下，几种离子在８ｍｉｎ内完成分离，检测限低至０．２ｍｇ／Ｌ。以Ｚｎ作内标，改善了方法的精密度，对于２０ｍｇ／Ｌ各离子峰面积的相对标准偏差（ＲＳＤ，ｎ＝９）＜６．５％。采用内标标准曲线法对镍矿样中Ｎｉ、Ｃｏ、Ｃｕ的含量进行了测定，线性范围分别在０．５～８０ｍｇ／ＬＮｉ２＋和Ｃｏ２＋，５～８０ｍｇ／ＬＣｕ２＋，结果与其它方法一致。 The absorption of electrolytes, α-hydroxyisobutyric acid as complexing agent, separation by capillary electrophoresis and the determination of Ni, Co and Cu in nickel ore by indirect ultraviolet spectrophotometry were studied. The effects of background electrolyte pH, α-hydroxyisobutyric acid (αHIBA) and imidazole concentration on the separation of Fe3 +, Co2 +, Ni2 +, Zn2 + and Cu2 + were investigated. Under optimized conditions, several ions were separated within 8 min with a detection limit as low as 0.2 mg / L. Using Zn as the internal standard, the precision of the method was improved with a relative standard deviation (RSD, n = 9) of <6.5% for the 20 mg / L ion peak area. The contents of Ni, Co and Cu in nickel ore samples were determined by the internal standard curve method. The linear range was 0.5 ~ 80mg / LNi2 + and Co2 +, 5 ~ 80mg / LCu2 + respectively. The results were consistent with other methods.