非抑制型离子色谱法测定碱金属、铵离子和烷基胺

 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 0mmol/L。以 4 0mmol/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。

Determination of Alkali Metals, Ammonium Ion and Alkyl Amines by Non-Suppressed Ion Chromatography

The determination of Li ,Na ,NH 4,K ,CH 3NH 2,CH 3CH 2NH 2 and CH 3CH 2CH 2NH 2 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 ,CH 3NH 2,CH 3CH 2NH 2 and CH 3CH 2CH 2NH 2 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%