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用单烷基磷酸酯（Ｐ５３８）的环己烷溶液，萃取铀（ＶＩ），改变水相硫氰酸铵的浓度，使分配比不断降低的实验方法，用水相不存在硫氰酸铵测得的分配比（Ｄ０）与存在硫氰酸铵时测得的分配比（Ｄ）之比与水相中硫氰酸根的平衡浓度的函数关系Ｄ０Ｄ＝１＋∑βｉ［ＳＣＮ－］ｉ研究铀（ＶＩ）与硫氰酸根形成配合物的稳定性，在温度２５℃，离子强度Ｉ＝２．８时，得到ＵＯ２ＳＣＮ＋（β１＝０．６４）、ＵＯ２（ＳＣＮ）２（β２＝１．１６）
Uranium (VI) was extracted with cyclohexane solution of monoalkyl phosphate (P538), the concentration of ammonium thiocyanate in the aqueous phase was changed, and the ratio of the distribution was continuously reduced. The test was conducted in the absence of ammonium thiocyanate in the aqueous phase (D0) versus the distribution ratio (D) measured in the presence of ammonium thiocyanate as a function of the equilibrium concentration of thiocyanate in the aqueous phase D0D = 1 + Σβi [SCN-] ) With thiocyanate, UO2SCN + (β1 = 0.64), UO2 (SCN) 2 (β2 = 1.16) were obtained at 25 ℃ and ionic strength I =