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锡在钒(Ⅳ)-盐酸-氯化钠体系中极谱催化波的研究和应用已有报导,我们应用这催化波分析矿物岩石中的锡时,利用硫酸钡共沉淀分离铅,能消除大量铅、二氧化硅的干扰。同时,试验了铜、铁等20多个伴生元素的干扰情况,实验表明,除了毫克以上氧化钙有负干扰外均不影响测定。H_2O_2、NO_3、对锡的测定有负干扰。锡的峰电位约为-0.60伏(对饱和甘汞电极),方法经长时间的生产实践,具有分析速度快、成本低、灵敏度高的优点。适用于含量在x—0.00x%锡的测定。仪器和试剂JP-1A型示波极谱仪,使用三电极系统,滴汞电极为阴极,饱和甘汞电极为参比电极,铂电极为辅助电伋,测定用导数部分。催化底液——称取17.5克偏钒酸钠,以500毫升1N
The research and application of the polarographic catalytic wave of tin in vanadium (Ⅳ) -hydrochloric acid-sodium chloride system It has been reported that when we use this catalytic wave to analyze tin in mineral rock, the use of barium sulfate coprecipitation to separate lead can eliminate a large amount of tin Lead, silica interference. At the same time, the interference of more than 20 associated elements such as copper and iron was tested. Experiments show that the determination does not affect except the negative interference of calcium oxide above milligrams. H_2O_2, NO_3, there is a negative interference with the determination of tin. The peak potential of tin is about -0.60 volts (for saturated calomel electrode). The method has the advantages of fast analysis, low cost and high sensitivity after a long time of production practice. For the content of x-0.00x% tin determination. Instruments and reagents JP-1A-type oscilloscope polarography, the use of three-electrode system, drop mercury electrode as the cathode, saturated calomel electrode as the reference electrode, platinum electrode auxiliary electric shock, measured with the derivative part. Catalytic Bath - Weigh 17.5 grams of sodium metavanadate in 500 ml of 1N