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本文介绍一种用聚氨酯泡沫塑料作提取剂的固—液萃取铊的方法。在溴水存在下,三价铊由0.5N—6N盐酸或2—20％混合酸(HNO_3+HClO_4+HF=1+1+1,体积比)溶液中,被聚氨酯泡沫塑料所吸附,然后用2％亚硫酸溶液加热至近沸解脱。分离和富集的铊用平台石墨炉原子吸收法测定。方法具有提取效率离、干扰少、操作简单、经济和容易推广的优点。本文已用于测定土壤、河底泥、煤飞灰、水泥和NBS—1646及1633a标准参考物质中的铊,均碍到满意的结果和较好精密度。
This article describes a method for the solid-liquid extraction of thallium using polyurethane foam as an extractant. In the presence of bromine water, trivalent thallium is adsorbed by urethane foam in a solution of 0.5N-6N hydrochloric acid or 2-20% mixed acid (HNO 3 + HClO 4 + HF = 1 + 1 + 1, volume ratio) 2% sulfuric acid solution was heated to near boil off. The separation and enrichment of thallium by graphite furnace atomic absorption spectrometry. The method has the advantages of low extraction efficiency, less interference, simple operation, economy and easy popularization. This article has been used to determine thallium in soils, river bottoms, coal fly ash, cement, and NBS-1646 and 1633a standard reference materials, all to satisfactory results and better precision.