6、离子测试（Ionic content） 该测试也是DI水非常重要的测试之一，主要监控DI水中各种阴阳离子的含量，测试结果一般用总量不超过多少微克来判定（ug/ml）。
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best luminescent ionic content 最佳发光离子浓度
The methods for calcium and magnesium ionic content analysis was set up and it was described in detail. It was proved to be simple, fast and accurate, which can meet the needs of production.
建立了盐水中钙、镁离子的分析方法并进行详细描述，利用该方法对不同取样点的盐水进行测定，证明该检测方法简便、快速、准确，能够满足生产需要。
Moreover, higher water content in the ionic liquid was favorable for obtaining higher enantioselectivity, however it lowered the reaction rate and(DL)-menthol conversion.
另外，在离子液体中，水含量的增加在一定程度上可以增大酯化手性选择性，但反应速率会被降低。
It is of great significance to the study of ionic contamination that the electrical conductivity of pore fluid in saturated sandy soil reflects the ion content.
饱和砂性土的孔隙水电导率直接反映了孔隙水中离子的含量，对研究土体离子污染有重要意义。
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