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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、钯、铂的定量测试,一般都需要进行富集和分离,而后才能进行测定。 萃取富集分离法就目前来说优于其它技术,许多试剂被推荐为萃取剂。作者认为
In nature, gold is predominantly interspersed in the rock or sand in the elemental state. The average gold content in the earth’s crust is 5 x 10 ~ (-7)%. Palladium and platinum tend to exist in the form of free elements and are rarely distributed in nature. Their Clarke values are 1 × 10 -6% and 5 × 10 -7%, respectively. Taking into account the representativeness of gold, the test often need to take a large sample. Quantitative testing of ultra-trace gold, palladium and platinum in rock and minerals generally requires enrichment and separation before they can be measured. Extraction enrichment separation method is currently superior to other technologies, many reagents are recommended as extractant. the author thinks