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氮素测定,最早为凯氏法,随后有甲醛法,扩散皿法,次溴酸盐法,库仑滴定法,染料结合法(2-7)等,这几种方法各有它的优缺点,有的准确度比较好,但操作麻烦,有的方法简便,但准确度又比较差,有的干扰因素太多,广泛应用又有局限性。为此对于氮的测定方法仍值得研究,我们利用甲醛法测铵的原理,采用恒电流库仑滴定的办法,用电位PH指示终点,测定了植物样品中的氮,其结果准确度好,分析灵敏度高,方法简便。
Nitrogen determination, the earliest Kjeldahl method, followed by formaldehyde method, diffusion dish method, hypobromite method, Coulometric titration, dye binding method (2-7), etc. These methods have their own advantages and disadvantages, Some accuracy is better, but the operation is cumbersome, and some methods are simple, but the accuracy is relatively poor, and some interfere with too many factors, there are limitations of wide application. For this reason, the determination of nitrogen is still worth studying, we use the formaldehyde method of ammonium determination, the use of constant current coulometric titration method, the potential PH indicates the endpoint, the determination of nitrogen in plant samples, the results of the accuracy of analysis High sensitivity, the method is simple.