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铊在矿石中的含量一般都很低。极谱法测定铊,常采用先经有机溶剂反复萃取,然后在氟化钾的碱性底液中测定。碘化钾可使镉、铅产生吸附催化波。本文提出在20％氟化钾,0.15％碘化钾的碱性底液中,铊可产生吸附催化波,可使灵敏度提高10倍。采用硫酸、氟化钾分离铅、铁等元素;利用二氧化锰共沉淀铊,使铜、锌、镉等元素大部分被分离出去。这样分离和富集铊不但避免了有机溶剂反复萃取,而且可测出样品中0.0000x％的铊。本法适用于硫化矿中微量铊的测定。
Thallium in the ore content is generally low. Polarographic determination of thallium, often used first repeatedly extracted by organic solvents, and then measured in alkaline solution of potassium fluoride. Potassium iodide can produce cadmium, lead catalytic adsorption wave. In this paper, Thallium can generate adsorptive catalytic wave in 20% potassium fluoride and 0.15% potassium iodide alkaline solution, which can increase the sensitivity by 10 times. The use of sulfuric acid, potassium fluoride separation of lead, iron and other elements; the use of manganese dioxide precipitation thallium, so that most of copper, zinc, cadmium and other elements were isolated. This separation and enrichment of thallium not only avoids the repeated extraction of organic solvents, and measurable 0.0000x% of thallium in the sample. This method is applicable to the determination of trace thallium in sulfide ores.