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一、前言钾是植物生长过程中消耗得最多的矿物元素之一,因此农业生产中需要经常进行钾的测定。有关钾的测定方法很多,其中比较主要的有氯铂酸盐法、高氯酸盐法、酒石酸盐法、亚硝酸钴盐法、二苦胺法(六硝基二苯胺盐法),亚硝基-R 盐法(1-亚硝基-2-萘酚-3,6-二磺酸钠盐法)、四苯硼酸盐法等。一般认为前两法最为准确,但由于使用的试剂昂贵,加以操作过程繁琐费时,不适于大批试样的分析。近年来四苯硼酸盐法在国外进行了很多的研究,被公认为是测定钾的最好试剂。但在国内未曾广泛应用,目前用得最多的还是亚硝酸钴盐法。此法在实际操作中又有重
I. Introduction Potassium is one of the most consumed mineral elements in the growth of plants. Therefore, the determination of potassium should be carried out frequently in agricultural production. There are many methods for the determination of potassium, among which chloroplatinate method, perchlorate method, tartrate method, cobalt nitrite salt method, diterpene method (hexanitro diphenylamine salt method), nitrite Radix method (1-nitroso-2-naphthol-3,6-disulfonic acid sodium salt method), tetraphenylborate method and the like. Generally believed that the first two most accurate method, but because of the expensive reagents used to operate the process cumbersome and time-consuming, not suitable for a large number of sample analysis. In recent years, tetraphenyl borate method carried out a lot of research in foreign countries, is recognized as the best reagent to determine potassium. However, it has not been widely used in China. At present, the most commonly used cobaltous nitrite salt method. This method in practice has another heavy