乙异羟肟酸与Zr(Ⅳ), UO<sup>2+</sup><SUB>2</SUB>配合物稳定常数的测定

乙异羟肟酸与Zr(Ⅳ), UO²⁺₂配合物稳定常数的测定

摘要: 对乙异羟肟酸(AHA)与Zr(Ⅳ), UO²⁺₂的配位行为进行了初步研究，测定了AHA与Zr(Ⅳ), UO²⁺₂配合物的稳定常数。结果表明，在HClO₄体系中，AHA与Zr(Ⅳ), UO²⁺₂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； β₁(UO²⁺₂)=(8.6±0.4)×10⁷， β₂(UO²⁺₂)=(3.8±0.1)×10¹⁴。

Abstract: An investigation was made on the formation of complexes between acetohydroxamic acid and UO²⁺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)×10¹³， β₂(Zr(Ⅳ)) =(1.8±0.1)×10²⁵， β₃(Zr(Ⅳ))=(3.8±0.3)×10³⁵； β₁(UO²⁺₂)=(8.6±0.4)×10⁷， β₂(UO²⁺₂)=(3.8±0.1)×10¹⁴.