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用实验证实六种有机溶剂对Ｎ，Ｎ－二乙基甲酰胺代甲基膦酸二正已酯（Ｅ）萃取金（Ⅲ）的影响。金萃取率随下列次序下降；１，２－二氯乙烷＞环已烷＞邻二甲苯～甲苯＞四氯化碳＞氯仿。在本例中，萃取率大小与溶剂的介电常数关系不大。稀释剂是通过影响萃取剂和萃合物的分配系数或活度系数而影响金（Ⅲ）的分配比。萃合物中金（Ⅲ）与Ｅ之组成比为１∶２。
The effects of six organic solvents on the extraction of gold (Ⅲ) from di-n-hexyl ester (E) of N, N-diethylformamide methylphosphonate were confirmed by experiments. The extraction rate of gold decreased in the following order: 1,2-dichloroethane> cyclohexane> o-xylene to toluene> carbon tetrachloride> chloroform. In this case, the extraction rate has little to do with the dielectric constant of the solvent. The diluent affects the partition ratio of gold (III) by affecting the partition coefficient or activity coefficient of the extractant and the extract. The composition of gold (Ⅲ) and E composition ratio of 1: 2.