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麦饭石具有治病强身奥秘,主要是含有硒、锶、锌、铌、铈、钇等多种微量元素。硒是必测元素。有关硒的资料报道较多,并对其反应机理作了探讨。我们在原有工作基础上,通过实践认为:提高硒测定的准确度,必须防止硒的损失,唯一的办法是分解试样中增大高氯酸用量和减小容器底部的面积,以使高氯酸能掩盖着杯底;欲达到勿需分离直接进行微量硒的测定,尚需要引入联合掩蔽剂。
Maifan stone has the mystery of strengthening the body, mainly containing selenium, strontium, zinc, niobium, cerium, yttrium and other trace elements. Selenium is a must test element. More information on selenium has been reported and the reaction mechanism has been discussed. Based on our original work, we think through practice that to improve the accuracy of selenium determination, we must prevent the loss of selenium. The only way is to decompose the sample to increase the amount of perchlorate and reduce the area of the bottom of the container so that the high chlorine Acid can cover the bottom of the cup; to achieve the determination of trace selenium without direct separation, the need to introduce joint masking agent.