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本文将萃合物在有机相中的状态分为共价键分子和离子键分子两类来讨论稀释剂影响的规律性，对于这两类萃取系统，分别提出了分配比（Ｄ）与有机相的平均溶解度参数（δ）及与介电常数（ε）间的近似失系。从这观点出发，讨论了稀释剂的性质和浓度对分配比的影响以及惰性稀释剂与萃取剂产生协同作用的条件。 对于ＴＢＰ萃取硝酸和硝酸铀酰，丁醚萃取三氯化铁和硝酸以及ＴＢＰ萃取高氯酸的稀释剂影响的规律性进行了实验研究。发现固定萃取剂的浓度改变稀释剂时，前两系统分配比的变化与稀释剂的δ有一定的关系，而对后三系统，以ＩｇＤ（或ＩｇＫｃ）对Ｉ／ε作圆时近似地得到直线。若用丁醚萃取硝酸或三氯化铁，以１，２－二氯乙烷或硝基苯作稀释剂时，发现它们与萃取剂有协同作用。
In this paper, the state of the extract in the organic phase is divided into covalent bond molecules and ionic bond molecules to discuss the regularity of the impact of the diluent. For these two types of extraction systems, respectively, the distribution ratio (D) and the organic phase The average solubility parameter (δ) and the dielectric constant (ε) between the approximate loss. From this point of view, the influence of the nature and concentration of the diluent on the distribution ratio and the conditions for the synergistic effect of the inert diluent and the extractant are discussed. The regularity of the influence of TBP on the extraction of nitric acid and uranyl nitrate, dibutyl ether extraction of ferric chloride and nitric acid, and the influence of TBP on the extraction of perchloric acid was studied experimentally. Found that fixed extractant concentration change diluent, the first two system distribution ratio and diluent δ have a certain relationship, and the latter three systems to IgD (or IgKc) to I / ε for a circle approximate to get straight line. If nitric acid or ferric chloride is extracted with dibutyl ether and 1,2-dichloroethane or nitrobenzene is used as a diluent, it is found that they have a synergistic effect with the extractant.