离子色谱法测定啤酒中的F^-、CI^-、SO_4^(2-)、NO_3^-和PO_4^(3-)

建立了以ASII-HC型阴离子交换柱分离、NaOH溶液为淋洗液、甲醇为有机改进剂、化学抑制电导检测测定啤酒中的F^-、cl^-、SO_4^(2-)、NO_3^-和PO_4^(3-)的离子色谱方法。各被测离子的线性关系良好,相关系数为0.9778～0.9991,测定结果的相对标准偏差为0.02％～3.60％,样品回收率为97.88％～103.80％。

BINARY AND TERNARY ION EXCHANGE KINETICS SO_4^(2-)-cl-NO_3^-201×7 SYSTEM

Kinetics of chloride/sulfate,chloride/nitrate and nitrate/sulfate forward exchanges and reverse exchanges at solution concentrations of 1N,0.2N and 0.02 N on 201×7 strong base anion exchange resin,respectively,have been examined at 25℃.It is found that the forward and the reverse exchange rates of the two given ions at low solution concentration,respectively,under identical conditions can be controlled by different mechanisms,while those at high solution concentration are all controlled by particle diffusion.The ternary exchange rates of sulfate/(chloride+nitrate) and nitrate/(chloride+sulfate)have also been examined.