Methods Omit and alter some work procedure including distillation,store reagent that show color,either the order of reagent procedure or recycle of the waste trichloromethane.

• 方法有条件的简化蒸馏步骤、显色剂储存使用、改变显色剂与氯仿的加入顺序、氯仿废液回收循环使用。