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矿石中组成复杂,大量基体对微量金银的测定有影响,不经分离在水相中连续测定金银尚不多见.但常采用的萃取原子吸收法,吸喷有机相时,刺激性较强,且读数不稳定,空白值较高.本文以文献单独测定金银为基础,对萃取反萃取体系作了试验,拟定在盐酸(5%)和碘化钾(0.05%)介质中用甲基异丁基酮(MIBK)对金银样液萃取,再用硫脲溶液(1.3%)反萃取;在水相中连续测定金和银,克服了在有机相测定的不足.本法萃取时盐酸和碘
Ore composition is complex, a large number of matrix on the determination of trace amounts of gold and silver, without separation in the water phase for the continuous determination of gold and silver is still rare, but commonly used extraction atomic absorption method, spray-jet organic phase, strong irritation, And the reading is not stable, the blank value is higher.In this paper, based on the separate determination of gold and silver literature extraction extraction system was tested, prepared in hydrochloric acid (5%) and potassium iodide (0.05%) medium with methyl isobutyl (MIBK) was extracted from gold and silver samples and then back extracted with thiourea solution (1.3%). Gold and silver were continuously measured in aqueous phase to overcome the deficiencies in the determination of organic phase.