The new method in the determination of negative ion surface-active agent is introduced, comparing with methylene blue method, it have merits of simple operation step and little dosage.
介绍了水中阴离子表面活性剂测定新方法，该法与亚甲蓝法比较，具有操作步骤简单，萃取剂用量少的优点。
The method of preparing cobalt blue pigment in the liquid phase was studied by using urea as homogeneous precipitating agent.
研究了用尿素为均匀沉淀剂，在液相中制备钴蓝颜料的方法。
Content of the products were quantitatively determined by two-phase chemical titration using bromophenol blue as the indicator and dichloroethane as the phase splitting agent.
以溴酚蓝为指示剂、二氯乙烷为分散相两相化学滴定法测定产物的含量。
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