The methods of purification for naphthenic acid consist of physical method and chemical method.

环烷酸的提纯方法主要有物理方法和化学方法。

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The various methods of purification through the use of selective adsorption have several features in common.

使用选择吸附的各种净化方法都有几个共同特征。

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In this paper, some methods of purification of bentonite were studied. Their basic principles, effectiveness of purification, merits and demerits were briefly introduced.

对几种膨润土提纯方法进行了研究，简述了其基本原理、提纯效果及优缺点。

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The choice of purification methods and the source of the drug will determine the nature and amount of contaminants in the final medicine. (Nothing is ever 100% pure.) Moreover, protein folding, various kinds of enzymatic modifications and impurities inevitably introduce variation, sometimes with unexpected results.

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