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催化极谱法测定碲是一种高灵敏的方法。但由于样品预处理手段和测定体系不同,效果各异。华北有色金属地质勘探公司研究所提出用焙烧富集分离的方法处理试样,使样品的分解和痕量碲的分离、富集同步进行,简化了样品的预处理过程。该方法是利用高温下碲易挥发的特点,以碳酸钠和氧化镁作为捕集剂,将高温下挥发出来的碲吸收于捕集剂中,然后以盐酸酸化,煮沸,使碲以四价形式进入溶液,分取部分溶液,以氢溴酸消除干扰元素。在盐酸-铼(vl)-聚乙二醇体系,利用示波极谱仪,从起始电位-0.4伏,反向扫描测定碲的极谱催化波,对样品的预
Catalytic polarographic determination of tellurium is a highly sensitive method. However, due to different means of sample pretreatment and measurement system, the effect is different. North China Institute of Nonferrous Geological Exploration Company proposed enrichment and separation by roasting method to deal with the sample, the sample decomposition and trace tellurium separation, enrichment simultaneously, simplifying the sample pretreatment process. The method utilizes the characteristic that the tellurium is easy to volatilize at high temperature, takes sodium carbonate and magnesium oxide as the collector, absorbs the tellurium volatilized from the high temperature into the collector, and then acidifies and boils with hydrochloric acid to make the tellurium in the form of tetravalent Into the solution, part of the solution was taken to eliminate the interference elements hydrobromide. In hydrochloric acid-rhenium (vl) -polyethylene glycol system, polarographic catalytic waves of tellurium were reverse-scanned from an initial potential of -0.4 volts using an oscillopolarographic apparatus,