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高纯铝中ppm级锌杂质的测定,现都采用酸分解试样后转化成pH约3.5的三氯化铝溶液,而后直接用悬汞电极或铂球镀银沾汞电极阳极溶出伏安法进行测定。在该底液中测定锌,氢离子浓度控制甚严,否则将干扰锌的测定。特别对于高纯铝中ppb级杂质锌的测定,即使底液中微量的氢离子存在,亦使锌波波底平直不易测量,产生严重的干扰。本试验利用玻璃碳电极导电性好、灵敏度高和氢的超电势高等优点,用二硫腙-四氯化碳溶液萃取分离铝基体及试样中共存的干扰杂质元素,同时对锌进行富集,而后在乙酸钠底液中用阳极溶出伏安法进行测定,解决了在一般
Determination of high-purity aluminum in ppm-level zinc impurities, are used to acid decomposition of the sample was transformed into a pH of about 3.5 aluminum chloride solution, and then directly with hanging mercury electrode or platinum ball silver mercury electrode anodic stripping voltammetry Measurement was performed. Determination of zinc in the bottom liquid, hydrogen ion concentration control is very strict, otherwise it will interfere with the determination of zinc. Especially for the determination of ppb grade zinc impurities in high-purity aluminum, even if a small amount of hydrogen ions exist in the bottom liquid, the zinc wave bottom is flat and not easy to measure, resulting in serious interference. In this study, the use of glassy carbon electrode conductivity, high sensitivity and hydrogen overpotential advantages, with dithizone - carbon tetrachloride solution extraction and separation of the aluminum matrix and interference elements in the sample coexist, while the enrichment of zinc , And then measured by anodic stripping voltammetry in sodium acetate bottom solution to solve the general