何美容 罗喜清 胡艳 赵海峰

8-羟基喹啉与许多金属元素,除碱金属外,在弱酸性或弱碱性溶液中能形成螯合物沉淀,这种沉淀分子量大,组成恒定。试样以硝酸和氢氟酸溶解,EDTA为掩蔽剂,在乙酸铵-乙酸(pH6.5)的缓冲溶液中,8-羟基喹啉与钨生成黄色沉淀,灼烧称量无水WO₃。分别对沉淀时pH值、陈化时间、沉淀剂的用量进行选择。研究出了一种快速、准确、经济的分析方法。分析准确度好、精密度高,完全能够满足生产分析要求。

Rapid Analysis the Molybdenum Element in Molybdenum-iron

on the basis of standard GB223.37-89, use dilute nitric acid to dissolve the samples and EDTA as a masking reagent, in the ammonium acetate - acetic acid (pH4.5) buffer solution, 8-hydroxyquinoline and molybdenum form to yellow precipitate, and then dry and weigh the anhydrous hydroxyquinoline salt [MoO₂(C₉H₆NO)₂]. Respectively select the pH value when precipitation, aging time and the amount of precipitant. At last we developed a fast, accurate and economic analysis methods. This method has high precision, good accuracy and fully able to meet the production analysis requirements.