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。
2
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。
3
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.