测定铀酰溶液中游离酸的各种方法,都必须考虑到消除UO_2~(2+)水解带来的影响。消除UO_2~(2+)水解影响的方法,可以采用沉淀法、离子交换法、萃取法等把UO_2~(2+)从样品液中分离出来,也可以利用某种络合剂与UO_2~(2+)形成稳定的络合物。Ahrland利用SO_4~(2-)与UO_2~(2+)形成稳定络合物后通过pH测量,测定了低酸度(<0.3M)铀酰溶液中的游离酸。 Various methods of determining free acid in uranyl solution must take into account the effect of eliminating the hydrolysis of UO 2 2+. The method of eliminating the effect of UO_2 ~ (2+) hydrolysis can be used to separate UO_2 ~ (2+) from the sample solution by precipitation method, ion exchange method, extraction method and the like, and also can utilize certain complexing agent and UO_2 ~ ( 2+) form a stable complex. Ahrland determined the free acid in low acidity (<0.3M) uranyl solution by pH measurement after forming a stable complex with SO_4 ~ (2-) and UO_2 ~ (2+).