乙异羟肟酸与Zr(Ⅳ),UO_2^(2+)配合物稳定常数的测定

Determination of the Stability Constants of Complexes of Zr(Ⅳ) and UO_2^(2+) With Acetohydroxamate

对乙异羟肟酸(AHA)与Zr(Ⅳ),UO22+的配位行为进行了初步研究,测定了AHA与Zr(Ⅳ),UO22+配合物的稳定常数。结果表明,在HCl O4体系中,AHA与Zr(Ⅳ),UO22+分别发生三、二级配位,其稳定常数分别为:β1(Zr(Ⅳ))=(6.7±0.1)×1013,β2(Zr(Ⅳ))=(1.8±0.1)×1025,β3(Zr(Ⅳ))=(3.8±0.3)×1035;β(UO2+)=(8.6±0.4)×107,β(UO2+)=(3.8±0.1)×1014。

An investigation was made on the formation of complexes between acetohydroxamic acid and UO^2＋2,Zr（Ⅳ） ions.The stability constants of the complexes of zirconium ion and uranyl ion with acetohydroxamic acid were determined by using the distribution method and the pH-potentiometric method respectively.The values of the stepwise stability constant thus obtained are the following： β1（Zr（Ⅳ））=（6.7±0.1）×10^13,β2（Zr（Ⅳ）） =（1.8±0.1）×10^25,β3（Zr（Ⅳ））=（3.8±0.3）×10^35;β1（UO^2＋2）=（8.6±0.4）×10^7,β2（UO^2＋2）=（3.8±0.1）×10^14.