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提出新型高通量离子色谱仪快速测定水利工程水样中5种阳离子Na+、NH4+、Mg2+、Ca2+和K+的含量的方法.采用TSKgel SuperIC-CR阳离子交换柱,以2.2 mmol·L-1甲基磺酸和1.00 mmol·L-118冠醚6的混合液为淋洗液,流量为0.7mL·min-1,柱温为40℃,凝胶抑制电导检测,可在18 min内完成对5种阳离子的分析.5种无机阳离子的质量浓度在一定范围内与其峰面积呈线性关系,Na+、NH4+、Mg2+、Ca2+和K+的检出限(3S/N)分别为7.1,6.3,9.5,10.0,8.3 μg·L-1,水样的加标回收率为95.3％～104％,相对标准偏差(n=5)为0.26％～4.0％.“,”A method for rapid determination of 5 cations in water sample of water project,including Na+,NH4+,Mg2+,Ca2+ and K+,by the novel and high throughput ion chromatography (IC) was proposed.Five cations were separated well in 18 rnin by TSKgel SuperIC-CR cation exchange column under gel suppressed conductivity detection,and a mixture of 2.2 mmol · L-1 methanesulfonic acid solution and 1.00 mmol · L-1 18-crown-6 solution was used as eluent at a flow rate of 0.7 mL · rnin-1,with column temperature of 40 ℃.Linear relationships between values of peak area and mass concentration of the 5 cations were kept in definite ranges.The detection limits (3S/N) of Na+,NH4+,Mg2+,Ca2+ and K+ were 7.1,6.3,9.5,10.0,8.3 μg · L-1,respectively.Values of recovery of the 5 cations in water samples were in the range of 95.3％-104％,with RSDs (n=5) ranged from 0.26％ to 4.0％.