【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。更多还原

【Abstract】 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 1×10-7-1×10-2mol·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.更多还原