总膳食研究中氟的测定方法

The Method for the Determination of Fluoride in the Total Diet Study

采用扩散—电极法测定样品中氟含量，本法检测限为氟１．０μｇ／ｇ（干样），样品的加标回收率为８５．０％～１０７．０％，相对标准偏差（ＲＳＤ）为４．５％～９．５％；同时测定标准参考物ＮＢＳ１５６６牡蛎粉的含量相当于原样的８７．９％～１０４．６％，ＲＳＤ为６．５％；含乙醇酒类样品的ＲＳＤ为３．１％。

his paper reports a microdiffusion method using fluoride ion selective electrode for determination of fluoride contents in dietary samples.The method was suitable for the determination of fluoride in different dietary samples.It was a simple and fast method,and could be applied in large amount of sample analysis.The minimum detectable limit of this method was 10μg fluoride in 10g dry dietary sample.The range of fluoride recovery and RSD in this dietary samples were 850%～1070% and 45%～95% respectively.The fluoride content determined in the oyster tissue of NBS 1566 SRM was 879%～1046% of certified SRM,and RSD was 65%.The RSD of fluoride determination in alcohol drinks was 31%.