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间隙水、上覆水由于采样困难,特别是间隙水采集的量极少,这给分析工作带来了困难。若采用无火焰原子吸收法则需富集。本文在综合钴、镍催化波有关报导的基础上,结合间隙水、上覆水中含量及其组份实际情况,探讨了连续测定的最佳条件,即采用2.1%氯化铵、2.7%亚硝酸钠、0.005%丁二酮肟、0.3%亚硫酸钠底液(pH=8.2-8.5),在示波极谱仪导数部分进行测定。钴、镍的峰电位分别为—1.15、—1.05伏、其浓度分别在0—5微克/升、0—20微克/升范围内呈线性关系。另外还解决了测定影响甚大的酸度问题。本法与原子吸收法对照结果相符。经大批样品测试,证明该法取样少(1毫升)、快速、灵敏、重现性好。亦适用于海水中钴及大于0.05微克/升镍的分析。
Gap water, overlying water due to sampling difficulties, especially the amount of interstitial water collected very little, which has brought difficulties for the analysis. If using flame atomic absorption method need to enrich. Based on the comprehensive reports of cobalt and nickel catalytic wave, the optimum conditions of continuous determination were discussed based on the contents of interstitial water and overlying water and the actual conditions of the components. The optimal conditions were 2.1% ammonium chloride, 2.7% nitrous acid Sodium, 0.005% dimethylglyoxime, 0.3% sodium sulfite at the bottom (pH = 8.2-8.5), measured in the oscillopolarographic derivative. The peak potentials of cobalt and nickel were -1.15 and -1.05 volts, respectively. The concentrations were in the range of 0-5 μg / L and 0-20 μg / L, respectively. In addition it also solved the problem of acidity, which has a great influence on the determination. This method is consistent with the results of atomic absorption spectrometry. After a large number of samples tested to prove that the law less sampling (1 ml), fast, sensitive, reproducible. Also applicable to the analysis of cobalt in seawater and> 0.05 μg / l nickel.