电热石墨炉原子吸收法测定贵金属(二)岩石矿物中超痕量金钯铂的测定

Determination of Noble Metals by Graphite Furnace AAS-2.Determination of Ultramicro Amounts of Au,Pd,Pt

在自然界中,金主要以元素状态散布在岩石层中或砂矿中,金在地壳中的平均含量为5×10^(-7)%。钯、铂往往以游离的元素状态存在,在自然界中分布很少,其克拉克值分别为1×10^(-6)%,5×10^(-7)%。考虑到金的代表性,测试时往往需要取大样。岩石矿物中超痕量金。

The sample was digested with hydrochloride acid and hydrogen-peroxide.Large amounts of Fe^(2+),A1^(3+),Mn^(2+),Ca^(2+),Mg^(2+),K^(+),Na^(2+),Co^(2+),Ni^(2+),Cu^(2+),Cd^(2+),Sn^(2+),Zn^(2+),Cr^(3+),Ti^(3+),Ga^(3+),In^(3+),Tl^(3+),Ge^(4+),Ag+,Rh^(3+),Ir^(4+),Os^(4+),Ru^(3+),PO_(4)^(3-),SO_(4)^(2-),Cl^(-),NO_(3),etc.,cause no interference after the extraction with n-octyl plenylamine.Au,Pd and Pt have no influences with each other.ppb concentration levels of Pt and less than ppb concentrtion level of Au and Pd in ores have been determined successfully.Detection limits.0.0001g/T for Au,0.0005g/T for Pd,and 0.001g/T for Pt.