提出了啤酒中Na+、NH+4、K+、Mg2+、Ca2+ 5种阳离子同时测定的离子色谱法.采用离子色谱分离,抑制电导检测.色谱条件选择为IonPac@CS 12A阳离子色谱柱(4 mm×250 mm),流动相为10 mmol·L-1甲烷磺酸溶液,流速为1.0 mL·min-1.方法的检出限(3S/N)在0.005~0.024 mg·L-1之间,测定结果的相对标准偏差(n=7)在0.89%~5.10%之间,加标回收率在93.7%~104.0%之间.

Five cations,i.e.,Na+,NH+4,K+,Mg2+ and Ca2+ in beer were determined by ion chromatography with supressed conductivity detection.The IonPac@CS 12A cation chromatographic column was used for separation of the cations,and 10 mmol·L-1 methane sulfonic acid solution was used as mobile phase,with a flow-rate of 1 mL·min-1.Detection limit (3S/N) found for the 5 cations were in the range of 0.005-0.024 mg·L-1.Values of RSD′s (n=7) of the results found were ranged from 0.89% to 5.10%.Recovery of the method were tested by standard addition method,giving results in the range of 93.7%-104.0%.