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在钾的测定方法中,塔纳那也夫(И.В.Тананаев)所拟定的亚硝酸钴重量法,由于形成沉淀的分子量大,溶解度小,所以被认为是测定方法中较好的一个。作者曾通过滴定沉淀后溶液中Ag~+减少的量,得到间接测定钾含量的容量法。因此不但简化了测定手续,还使分析时间缩短。但此沉淀的组成同其他某些钾盐沉淀的组成一样,没有固定的比例。所以测定时必须严格遵守一定的操作手续,对所得结果有时需乘以经验的系数。为了克服上述缺点,经我们研究:若测定时,能对亚硝酸钴银钾沉淀中的NO_2~-和Ag~+同时进行滴定,从二者滴定数之差以求出钾的含量,将是简易而准确的。因
In the method of potassium determination, the weight method of cobaltous nitrite proposed by Tannerväht is considered to be the better one because of the large molecular weight and the low solubility of the precipitate formed. The authors have titrated the amount of Ag ~ + in the solution after the titration to obtain a volumetric method for the indirect determination of the amount of potassium. This not only simplifies the measurement procedure but also shortens the analysis time. However, the composition of this precipitate is the same as that of some other potassium precipitates and there is no fixed ratio. Therefore, the determination must strictly abide by certain operating procedures, the results obtained sometimes multiplied by the empirical coefficient. In order to overcome the above shortcomings, after our study: If the determination, can be titration of NO2 ~ - and Ag ~ + in the cobalt-potassium nitrite precipitation, from the difference between the two titration to find the amount of potassium, will be Simple and accurate. because