The study of salt and mixed solvents not only enrich solution chemistry, but also possess important significance to separation preparation and purification of salt.
研究这类盐—混合溶剂体系既可以丰富溶液化学，而且对盐类的分离制备和纯化具有重要的实际意义。
Purification is mainly done by adding zinc dust to the solution. As all the elements to be removed lie below zinc in the electrochemical series they can be precipitated by cementation.
净化过程主要是加入锌粉到溶液，这样所有电位序在锌之后的元素都被置换出来并且凝固沉淀下来。
From the information given in the table calculate the specific activity of the enzyme solution after each purification procedure.
根据表中信息，计算每个纯化步骤酶的比活力。
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