镉中痕量铊的测定，一般都用分光光度法，所用试剂如孔雀绿、结晶紫、罗丹明B等[1,2]．方法灵敏度低，分析手续繁琐．阳极溶出伏安祛测定铊（I），灵敏度可达3．5×10－10mol/L。此法已用于天然水、岩石矿物中痕量铊（I）的测定（31本文研究了以汞膜电极为工作电极，饱和甘汞电 Determination of trace amounts of thallium in cadmium, the spectrophotometry are generally used, reagents used such as malachite green, crystal violet, rhodamine B [1,2]. The sensitivity of the method is low and the analysis procedure is cumbersome. Anodic dissolution voltammetry determination of thallium (I), the sensitivity of up to 3.5 × 10-10mol / L. This method has been used for the determination of trace amounts of thallium (I) in natural waters and rock minerals (31). This paper studied the use of mercury film electrodes as working electrode, saturated calomel