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一、准确极谱操作法 常量的测定,准确度要求高,相对误差一般要小于1％,能达到0.2％就相当好。各种测试方法如X萤光法、原子吸收法,比色法都在设法达到这个要求,但目前还是重量法和容量法用得较为普遍。 极谱法对测定中等含量(5～0.01％)的有色金属被公认为好方法。近年来,由于催化极谱的发展,对低含量的测定也有很快的发展。测定元素一直在增加,并得到广泛的应用。但是极谱法用于常量的测定存在困难较多,主要原因是准确度不够。虽有相当多的单位做常量铅、锌等元素的测定,但人们总认为有点勉强。高鸿教授提出的示波滴定也是常量测定的一个途径,目前还处在发展阶段。
First, accurate determination of polarographic method constant, high accuracy, the relative error is generally less than 1%, can reach 0.2% is quite good. A variety of test methods such as X-fluorescence, atomic absorption, colorimetric are trying to meet this requirement, but at present gravimetric and volumetric method is more common. Polarographic method for the determination of medium content (5 ~ 0.01%) of non-ferrous metals is recognized as a good method. In recent years, due to the development of catalytic polarography, there is also a rapid development of low content determination. Determination of elements has been increasing, and has been widely used. However, polarography is more difficult to determine the constant, mainly due to the lack of accuracy. Although a considerable number of units to do the determination of lead, zinc and other elements, but people always think that a little reluctantly. Professor Gao Hong oscillometric titration is also a way of constant determination, is still in the development stage.