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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％。
The fluoride content in the sample was determined by diffusion-electrode method. The detection limit of this method was 1.0μg / g fluorine (dry sample), and the spiked recoveries were 85.0% -107.0%. The relative standard deviation (RSD) 4.5% ~ 9.5%. Meanwhile, the content of standard reference NBS1566 oyster powder was equivalent to 87.9% ~ 104.6% of the original sample and the RSD was 6.5%. The RSD of ethanol-containing alcoholic samples was 3.1%.