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排除钴、镍对锌的极谱分析干扰,前人做了不少探索,至今仍然没有得到很好解决,据文献报导,在0.03MNaCNS—1MNH_4AC—1MHAC底液中,当钴、镍共存时,有可能用极谱法直接测锌。对此,我们经过反复实验,发现在该底液条件下,只能排除1.6倍于锌的钴、镍对锌波的干扰。陈乃燐等在氨性底液中,加入氨三乙酸的氨溶液和抗坏血酸,Co~(2+)量在Zn~(2+)的40％以内,不干扰Zn~(2+)的测定。我们发现在NaCNS—HAC—NaAC底液中,加入柠檬酸三钠和抗坏血酸的条件下,可排除20倍于锌的钴、10倍于锌的镍对锌波
Exclusion of cobalt, nickel, zinc polarographic interference, many predecessors did a lot of exploration, has not been well resolved, according to the literature, 0.03MNaCNS-1MNH_4AC-1MHAC base solution, when cobalt and nickel coexist, It is possible to measure zinc directly by polarography. In this regard, after repeated experiments, we found that under the conditions of the bottom liquid, can only be ruled out by 1.6 times zinc cobalt, nickel on the zinc wave interference. Chen Naizai and other ammoniacal bottom liquid, adding ammonia triacetin solution and ascorbic acid, Co ~ (2+) content of Zn ~ (2+) within 40%, does not interfere with the determination of Zn ~ (2+). We found that NaCNS-HAC-NaAC in the bottom solution, the addition of trisodium citrate and ascorbic acid conditions, can be excluded 20 times the cobalt of zinc, 10 times the zinc nickel zinc on the wave