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本文介绍了高选择性的湿法富集与高灵敏度的无火焰原子吸收相结合测定微量金、铂和钯的新方法。实验证明,在0.1—4mol/1 HCl介质中,Zeph与[PtCl_6]~(2-)、[PdCl_4]~(2-)、[AuCl_4]~- 形成的三元络合物能被C_2H_4Cl_2定量萃取。从而能使0.x微克的金、铂、钯与大量铁、铜、钴、镍、铬(Ⅲ)、钙、镁、铝、铅等元素分离。有机相可直接测定,若要转为水相测定,只须在水浴上加热将有机溶剂赶尽,Zeph无须破坏。
This paper presents a new method for the determination of trace gold, platinum and palladium with high selectivity and wet enrichment combined with high sensitivity flameless atomic absorption. The experimental results show that the ternary complex of Zeph with [PtCl_6] ~ (2 -), [PdCl_4] ~ (2 -) and [AuCl_4] ~ ~ can be quantitatively extracted by C_2H_4Cl_2 in 0.1-4mol / . Thus 0.x micrograms of gold, platinum, palladium and iron, copper, cobalt, nickel, chromium (III), calcium, magnesium, aluminum, lead and other elements can be separated. The organic phase can be measured directly. If it is to be changed to aqueous, only the organic solvent needs to be expelled by heating in a water bath, Zeph need not be destroyed.