本文提出以硅胶为载体,二乙基二硫代胺基甲酸铋Bi(DDC)_3作萃取剂组成固定相,7%的盐酸溶液为流动相进柱并淋洗杂质,用0.5mol L~(-1)的HBr溶液洗脱铊,罗丹明B吸光光度法测定。置换萃取色层是一种新颖的分离富集方法。目前尚未见到报道应用于分离富集铊。本文研究了置换萃取色层分离富集铊的条件,并应用该法成功地测定了矿石中痕量铊。 In this paper, silica gel as a carrier, bismuth diethyldithiocarbamate bismuth (DDC) _3 extractant as stationary phase, 7% hydrochloric acid solution as the mobile phase into the column and rinsing impurities, with 0.5mol L ~ ( -1) of HBr solution eluting thallium, rhodamine B absorbance spectrophotometry. Displacement extraction chromatography is a novel separation and enrichment method. No reports have been reported so far for the separation and enrichment of thallium. In this paper, the conditions for the separation and enrichment of thallium by displacement chromatography were studied. The method was successfully applied to the determination of trace amounts of thallium in ore.