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用高硫酸铵法、铋酸钠法测定铈,锰有严重干扰,而锰在地壳中分布极广,几乎一切矿物岩石中都或多或少含有锰,因此研究并制订一个在含锰矿石中不分离锰直接测定铈的快速法是有实际意义的。郭承基用磷酸溶矿,直接用亚铁滴定铈,预先用氯化钠除去锰的干扰;但由于稀释煮沸时,铈与其他希土元素生成胶状磷酸盐沉淀,无法进行测定,若加入一定量的硫酸,虽能防止希土元素磷酸盐沉淀的析出,但用氯化物除锰时,铈也同时被还原。为了解决上述困难,笔者在郭承基方法的基础上作了下列改进,即:用硫酸与硫酸铵溶矿后,加入大量硫酸铵,使之与铈生成可溶性络合物。这样既避免了希
High ammonium sulfate method, sodium bismuth determination of cerium, manganese have a serious interference, and manganese is widely distributed in the crust, almost all mineral rock contains more or less manganese, so research and develop a manganese-containing ore The rapid method of direct determination of cerium without separating manganese is of practical significance. Guo Chengji dissolved with phosphoric acid, direct titration of ferrous with cerium, sodium chloride in advance to remove the interference of manganese; but due to dilution when boiled, cerium and other rare earth elements produce gelatinous phosphate precipitation, can not be measured, if added a certain amount Although sulfuric acid can prevent precipitation of rare earth phosphate, when cerium is removed by manganese chloride, cerium is simultaneously reduced. In order to solve the above difficulties, the author made the following improvements on the basis of Guo Chengji’s method, namely, after dissolving with sulfuric acid and ammonium sulfate, adding a large amount of ammonium sulfate to make soluble complex with cerium. This avoids hope