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利用丁二肟试剂极谱法测定钴镍已有不少报道,但因镍灵敏度不高,痕量钴镍的连续测定尚有困难。本文发现在标题体系中,钴镍均能产生相当灵敏的催化波,钴镍的检出下限分别可达0.02ppb和0.3ppb,浓度Co在0.04—2.5ppb。Ni在0.5—50ppb范围内与波高成线性关系。在该体系中连续测定环境样品中的钴镍具有灵敏度高、选择性好、方法简便等优点。本文提出了连续测定环境样品中痕量钴镍的方法,并经批量生产考验,结果满意。
Cobalt and Nickel have been reported by polarography with butanedioxymethane. However, the determination of trace cobalt and nickel is difficult due to the low sensitivity of nickel. It is found that cobalt and nickel can produce quite sensitive catalytic wave in the title system. The detection limits of cobalt and nickel are up to 0.02ppb and 0.3ppb respectively, and the concentration of Co is 0.04-2.5ppb. Ni has a linear relationship with wave height in the range of 0.5-50 ppb. Continuous determination of cobalt and nickel in environmental samples in this system has the advantages of high sensitivity, good selectivity and simple method. This paper presents a continuous method for the determination of trace amounts of cobalt and nickel in environmental samples, and is tested by mass production with satisfactory results.