The optimal HLB was found to be 11.76 by evaluation of 10% butachlor EW, which was emulsified by the different HLB emulsifier consisted of Span 20 and Tween 20. According to the optimal HLB, different emulsifiers were studied.

• 对10%25丁草胺水乳剂；采用Span20和Tween20复配系列不同HLB乳化剂的方法；发现水乳剂体系的最佳HLB值为11.；76。