熔融萃取法富集痕量铂和铑─石墨炉原子吸收光谱测定

Enrichment of Trace Amounts of Platinum andRhodium by means of Molten Naphthalene Extraction andTheir Subsequen t Atomic Absorption Spectrometric Deter-mination

本文报道以２－硫基苯并噻唑（ＭＢＴ）为络合剂，用熔融萘萃取痕量的铂和铑，继用石墨炉原子吸收光谱法直接测定之。文中曾对一些有关参数作了试验，并找出各参数的最优值，对共存离子的允许量也作了试验。最后用国家标样和部级管理样核对本法，结果令人满意。

A method is described for the enrichment of traceamounts of platinum and rhodium as 2-mercaptobenzo-thiazole complexes by means of molten naphthalene ex-traction.The solidified naphthalene phase is separatedfrom the aqueous phase, and dissolved in N,N-dimethylformamide (DMF).The noble metals in DMFsolution are determined directly with graphite- furnaceZeeman atomic absorption spectrometry(ET- AAS).Several parameters have been studied experimentally andtheir optirnum values are found. The effect of diverse ionshas been stud ied.Finally the proposed method has beenchecked with national reference materials and controlsamples from the Ministry of Metallurgy,and satisfactoryresults are obtanined.