Abstract: The aim of our study was to develop an optimized method for the determination of fluoride content in rice. During determination, ultrasonic extraction was used and the calculation method of fluoride content was modified. The results showed that the relative standard deviations（RSD） of this method ranged from 2.9％ to 8.4％, the averaged recovery rate ranged from 90.8％ to 102.5％, respectively. The relative deviations between the Ion Chromatography and this method was less than 10%, all of the parameters meet the demands of determination. The method had the virtues of low costs, easy to operate, good repeatability, high recovery rate, and can meet the needs of rice detection.

Key words: fluoride content, ion selective electrode method, rice quality

摘要： 本研究的目的是建立一种改良的利用氟离子选择性电极来测定稻米样品中氟含量的方法。通过在前处理中采用超声波提取法，同时改进了氟离子浓度的计算方法，建立了一种新的稻米中氟含量的测定方法。试验结果表明，该测定方法的精密度为2.9％～8.4％，平均回收率为90.8％～102.5％；同时该方法与离子色谱法测定的结果的相对偏差都小于等于10%，符合检测要求。该方法具有检测成本低、操作简便、重复性好、回收率高、结果可靠的优点，能满足对稻米样品的测定需要。

关键词: 氟含量, 离子选择性电极法, 稻米品质