微分脉冲极谱法测定痕量铀  

Determination of trace uranium by differential pulse polarography

作　　者：何为[1] 王守绪[1] 唐先忠[1] 

机构地区：[1]电子科技大学应用化学系,四川成都610054

出　　处：《冶金分析》2006年第1期52-55,共4页Metallurgical Analysis

摘　　要：在pH4．2～8．2的范围内，U（Ⅵ）与8-羟基喹啉反应生成不溶于水的络合物，定量吸附在微量萘的表面上，用15mL 2mol／L的HCl使该络合物脱附溶解后，在滴汞电极上采用微分脉冲极谱法测定痕量铀。方法的检出限达到0．02μg／mL，线性范围为0．05～15μg／mL，工作曲线的线性相关系数r=0．9993，相对标准偏差为1．1％。讨论了pH、微晶萘的浓度、水的体积和干扰离子等对测定结果的影响。方法已用于人工合成样品和工业废水中痕量铀的测定。Uranium（Ⅵ） reacts with 8-hydroxyquinoline（abbreviated 8-OX）to form a insoluble complex which is quantitatively absorbed on the surface of micro crystalline naphalene in the range of pH 4.2 - 8.2. The trace amounts of uranium is determined by differential pulse polarography on dropping mercury electrode after the complex is desorpted and soluted by dilute HCl. The detection limit of uranium is 0.02 μg/mL and the linear range is 0.05- 15μg/mL with correlation coefficient of 0. 999 3 and relative standard deviation of 1.1%. Many parameters such as the effect of pH, volume of aqueous phase as well as interference of a number of salts anions and cations on the determination of uranium are also discussed. The method has been apllied to the determination of trace uranium in synthetic sample and industrial wastewater.

关 键 词：铀 微分脉冲极谱 滴汞电极 8-羟基喹啉 合成样品 工业废水 

分 类 号：O657.14[理学—分析化学]