The determination of Li+,Na+,NH+4,K+,CH3NH2,CH3CH2NH2 and CH3CH2CH2NH2 by non-suppressed ion chromatography using sulfamic acid as mobile phase is described. A cation-exchange column was employed for separation with conductivity detection. The effect of the eluent concentration on retention value was studied. The retention value of ions decreased with increasing the eluent concentration.The suitable eluent concentration was 4.0 mmol/L. When 4.0 mmol/L sulfamic acid was used as mobile phase, the detection limits(mg/L) for Li+,Na+,NH+4,K+,CH3NH2,CH3CH2NH2 and CH3CH2CH2NH2 were 0.008,0.029,0.027,0.099,0.069,0.163 and 0.417 and the linear ranges of calibration curve(mg/L) were 0.008-20,0.029-20,0.027-20,0.099-30,0.069-30,0.163-40 and 0.417-40, respectively. The method has been applied to the determination of tap water samples. The recoveries of added standard were 94.0%-97.6%.%采用非抑制型离子色谱法、以氨磺酸作流动相分离测定了Li+、Na+、NH+4、K+、甲胺、乙胺和正丙胺等7种物质，研究了氨磺酸流动相浓度对溶质保留值的影响。结果发现，随着流动相浓度的增大，溶质保留值减小；适宜的流动相浓度为4.0 mmol/L。以4.0 mmol/L氨磺酸为流动相测得上述7种物质的检出限及工作曲线的线性回归方程。方法应用于自来水试样的分析，结果良好。
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