提出了离子色谱法测定茶叶中F-、Cl-、NO2-、Br-、NO3-、H2PO4-、SO42-等无机阴离子的方法。采用Shodex IC SI-52 4E阴离子分离柱进行分离,以3.6 mmol·L-1碳酸钠溶液和甲醇以体积比98比2混合所得溶液为淋洗液进行洗脱,从而实现7种阴离子的分离。根据茶叶中分离出的7种阴离子含量的不同,利用聚类分析将16个茶叶样品进行分类。

Ion chromatography was applied to the determination of F-, Cl-, NO2-, Br-, NO3-, H2PO4- and SO42- in Chinese tea. Shodex IC SI-52 4E anion-exchange column was used for separation, and a mixed solution of 3.6 mmol·L-1 Na2CO3 solution and methanol mixed in the ratio of 98 to 2 by volume was used as eluent. A total of 16 kinds of tea samples of different categories were taken as testing samples, based on the different contents of the 7 inorganic anions, the tea samples were classified by applying the clustering analysis.