[Determination of alkali metals, ammonium ion and alkyl amines by non-suppressed ion chromatography].
The determination of Li+, Na+, NH4+, 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+, NH4+, 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%.
Yu
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Department of Chemistry, Harbin Normal University, Harbin 150080, China.
Li
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D000588:Amines / Q000032:analysis*; D002852:Chromatography, Ion Exchange / Q000379:methods; D008672:Metals, Alkali / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis*; D012044:Regression Analysis; D013451:Sulfonic Acids; D014881:Water Supply / Q000032:analysis
D000588:Amines; D008672:Metals, Alkali; D000644:Quaternary Ammonium Compounds; D013451:Sulfonic Acids; C005741:sulfamic acid