火焰原子吸收法直接测定矿物中银,具有操作简单、快速,准确的优点。但是,一般只能测定含银在10克/吨以上的试料。对于含量更低的物料,灵敏度达不到要求。若增大取样量,则其它金属离子量也随之倍增,难以直接测定,必须预先分离富集。在这方面,已有过很多的报导和应用。文献报导能从磷酸介质中以碘化钾—甲基异丁酮 Flame atomic absorption method for direct determination of mineral silver, with simple, fast, accurate advantages. However, generally only the silver content of 10 g / t or more of the sample. For lower content of the material, the sensitivity does not meet the requirements. If you increase the sample size, the amount of other metal ions will also double, it is difficult to directly measure, you must pre-enrichment. In this regard, there have been many reports and applications. Reported in the literature from the phosphoric acid medium to potassium iodide - methyl isobutyl ketone