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玻炭电极除在溶出分析中获得广泛应用外,还没有应用到常规极谱分析中。鉴于常规极谱中所用的滴汞电极容易造成汞对环境的污染,拟以玻炭球银膜电极代替常规极谱中的滴汞电极进行了试验,并应用于试样中铜、镍、锌的测定,结果满意。一、电极的镀膜玻炭球电极要获得好的重现性和宽裕的工作电压范围,其表面处理则十分重要,一般须在表面镀成银膜和汞膜使用。实验表明,银膜电极只能在无Cl~-、I~-、Br~-、S~(2-)、CrO_4~(2-)等的底液中测定锑、铋、铜、铅、镉、镍、锌等元素,这样的底液成分有乙酸-乙酸钠、酒石酸-酒石酸钠等;而且溶样时不能用盐酸。如果要使玻炭电极能够象滴汞电极一样对底液的适应性广,则要在镀银的表面进而镀汞。
In addition to the extensive use of glassy carbon electrode dissolution analysis, it has not been applied to conventional polarographic analysis. In view of mercury in the conventional polarographic mercury electrode is likely to cause environmental pollution, to be replaced by glassy silver ball electrode in conventional polarographic mercury drop electrodes were tested and applied to the sample of copper, nickel, zinc The results were satisfactory. First, the electrode coating Glass ball electrode to get good reproducibility and ample working voltage range, the surface treatment is very important, generally must be plated on the surface of the silver film and the use of mercury film. The experiment shows that the silver film electrode can only measure the antimony, bismuth, copper, lead and cadmium in the bottom liquid without Cl ~ -, I ~ -, Br ~ -, S ~ (2 -), CrO_4 ~ , Nickel, zinc and other elements, such as the bottom liquid components of acetic acid - sodium acetate, tartaric acid - sodium tartrate; and the sample can not be used when hydrochloric acid. If the glassy carbon electrode is to be as adaptable as the droplet mercury electrode to the bottoms, mercury is plated on the silver-plated surface.