硝酸活化高灵敏度离子选择性电极法测定氟  

HIGH SENSITIVE ION-SELECTIVE ELECTRODE FOR THE DETERMINATION OF FLUORIDE BY NITRIC ACID ACTIVATION

作　　者：李正平[1] 王宝君[1] 苏玉芹[1] 石生勋[1] 成永强[1] 

机构地区：[1]河北大学 化学与环境科学学院,保定071002

出　　处：《理化检验（化学分册）》2006年第5期363-365,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：先在0．5 mol·L-1硝酸介质中活化氟离子选择性电极,再在含硝酸的总离子强度调节混合液(TISAM)中测定氟,线性范围为1×10-7～1×10-2mol·L-1,检出限为1．9μg·L-1。该方法应用于绿茶饮料、水、牛奶中痕量氟的测定,结果的RSD小于4．8％,回收率在96．1％至100．2％之间,对氟离子选择性电极在硝酸介质中的活化机理作了阐述。A highly sensitive method for the determination of traces of fluoride with an activated ion-selective electrode （ISE） is developed in this paper. The ISE was activated by immersing in 0. 5 mol · L^-1 HNO3 solution, and determination of fluoride was carried out in the total ionic strength adjusting buffer （TISAB） solution containing HNO3 with the activated ISE. Linearity was ranged between 1×106-7 -1 ×10^-2mol · L^-1 of fluoride ion, with a detection limit of 1.9μg·L^-1. The method has been applied to the determination of trace amounts of fluoride in samples of green tea, drinking water and milk giving RSD＇s less than 4.8% and recoveries in the range of 96. 1% to 100. 2%. Activation mechanism was discussed briefly.

关 键 词：离子选择性电极 氟化物测定 活化 

分 类 号：O657.31[理学—分析化学]