论文部分内容阅读
利用极谱法分析锌,通常用1N 氨一氯化铵作良好的支持电解质,当镍接近于锌的含量时,亦可以同时分析镍,但镍先行于锌波,当镍超过锌含量的3倍以上,就难以同时分析镍、锌。只有将镍用萃取或其他方法分离后,方可极谱测定锌。铝铁镍青铜中含镍量4%左右,冶金部标准规定电解除铜后,用异戌醇萃取分离,再以氨一氯化铵反萃取出锌,最后于水相中以氨一氯化铵为支持电解质,极谱法测定锌。我们利用在氢氧化钠溶液中加入 EDTA,可使镍波全部抑制,而 Zn-EDTA 络盐却离解成 ZnO_2~(2-),其波高和不加入 EDTA 于氨一氯化铵底液中约一致[注1]。我们根据这一原理,对铝铁镍青铜中锌的测定,将部标规定原萃取这一步改为在2N 氢氧化钠溶液中加入
Polarographic analysis of zinc, usually with 1N ammonia chloride as a good supporting electrolyte, when the nickel is close to the content of zinc, nickel can also be analyzed at the same time, but nickel precedes the zinc wave, when the nickel exceeds the zinc content of 3 Times, it is difficult at the same time analysis of nickel, zinc. Only after the nickel is separated by extraction or other methods, zinc can be measured polarographicly. Aluminum nickel bronze nickel content of about 4%, the Ministry of Metallurgical Standards Electrolytic copper, with isoamyl alcohol extraction and separation, and then ammonia ammonium chloride back extraction of zinc, and finally in the aqueous ammonia monochlorination Ammonium as Support Electrolyte, Polarographic Determination of Zinc. We use the sodium hydroxide solution by adding EDTA, nickel waves can be completely inhibited, and Zn-EDTA complex salt is dissociated into ZnO_2 ~ (2-), the wave height and without adding EDTA in the ammonium chloride solution about Consistent [Note 1]. We based on this principle, the determination of zinc in aluminum-iron-nickel bronze, the standard provisions of the original extraction step to 2N sodium hydroxide solution was added