英语语法分析

We tested the quantity of fluoride in tea leaves by separately using fluorinion selective electrode and the ion chromatographys.

我们分别采用离子色谱法和氟离子选择电极法对茶叶中氟化物的含量进行测定。

Methods:First, we tested the quantity of fluoride in tea leaves by separately using fluorinion selective electrode and the ion chromatography and then compared the results.

方法：分别采用离子色谱法和氟离子选择电极法对茶叶中氟化物的含量进行测定，并将结果进行比较。