亚硝酸钠作释放剂选择性螯合滴定法测定钯

SELECTIVE CHELATIOMETRY DETERMINATION OF PALLADIUM WITH NaNO_2 AS RELEASING AGENT

用EDTA螯合Pd2+和其它金属离子,然后用亚硝酸钠分解Pd-EDTA螯合物,释放出的EDTA用Zn2+标准溶液进行返滴定。大量各种金属离子都不干扰。用于测定Pd-Cu合金镀层、Pd-Sn-Cu合金镀层和Pd-Ti-Si合金中的钯,获得相当满意的结果。

It is based on initial chelation of Pd2+and other metal ions with EDTA and its subsequent the Pd-EDTA chelates using NaNO2 as releasing agent,the liberated EDTA with Zn2+ standard solution is back-titrated.A large number of metal ions,do not interfere.The method has been used the determination of Pd in Pd-Cu alloy Deposits,Pd-Sn-Cu alloy deposits and Pd-Ti-Si alloy,obtained pretty satisfactory results.