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目的建立灰化-离子色谱法测定茶叶中总氟的方法。方法样品经灰化处理后,用离子色谱法测定。淋洗液为1.8mmol/L Na2CO3-1.7mmol/L NaHCO3。结果相对标准偏差(RSD)为0.53%,回收率为97.2%～97.4%,最低检出浓度为0.5mg/kg。结论用灰化-离子色谱法测定茶叶中总氟,方法便捷、灵敏度高、精密度好、回收率高、结果可靠。
Objective To establish a method for the determination of total fluorine in tea by means of ashing-ion chromatography. Method After the sample was treated with ashing, determined by ion chromatography. The eluent was 1.8 mmol / L Na2CO3 - 1.7 mmol / L NaHCO3. Results The relative standard deviation (RSD) was 0.53%, the recovery was 97.2% ~ 97.4%, and the lowest detection limit was 0.5mg / kg. Conclusion Determination of total fluoride in tea by ash chromatography - ion chromatography, the method is convenient, high sensitivity, good precision, high recovery, the results are reliable.