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阳极溶出法测定水中 ppb 级锌、镉、铅、铜,前人作过大量工作。由于锌、铜生成金属间化合物,而使锌、镉、铅、铜四个元素同时测定遇到困难和限制。目前一般都是分二步测定,先溶出测定镉、铅、铜,而后测定锌;直接同时测定范围早年为50ppb,最近(配脉冲极谱)为1～100ppb。我们采用乙酸-盐酸-吡啶为底液,玻璃炭镀汞电极阳极溶出法,配脉冲极谱仪,进行 PPb 级锌、镉、铅、铜直接同时测定。测定上限可达350ppb,测定下
Anodic dissolution method for the determination of ppb zinc, cadmium, lead, copper in water, a large number of previous work. Due to zinc, copper intermetallic compounds, which made the determination of four elements of zinc, cadmium, lead and copper encountered difficulties and limitations. Now generally divided into two steps, the first dissolution of the determination of cadmium, lead, copper, and then the determination of zinc; direct simultaneous determination of the range of early 50ppb, the most recent (with pulse polarography) of 1 ~ 100ppb. We use acetic acid - hydrochloric acid - pyridine as the base solution, glassy carbon electrode mercury anode anodic dissolution method, with pulse polarography, PPb grade zinc, cadmium, lead, copper direct simultaneous determination. Determination of up to 350ppb, under the determination