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目的建立快速、准确的水中氟(F)的高分辨连续光源原子吸收光谱法(HR-CS-AAS)。方法运用均匀实验设计优化HR-CS-AAS测定水中氟的实验条件,通过精密度、检出限及回收率实验,对方法的可靠性进行了评估。结果运用均匀实验设计优化了石墨炉升温程序,在651.187 nm以灰化温度950℃、原子化温度2 200℃进行检测,F在50 ng内线性良好。对废水标准样品的检测结果回收率为95.6%~104%,均在参考值范围,测定相对标准偏差为2.58%~3.03%,方法检出限为42μg/L。结论均匀实验设计适用于多水平多因素的实验;该检测方法具有简便、快速、准确、灵敏的特点,可作为水中氟测定的可靠方法。
Objective To establish a rapid and accurate high-resolution continuous-flow atomic absorption spectrometry (HR-CS-AAS) for fluoride in water. Methods The uniform experimental design was used to optimize the experimental conditions for the determination of fluorine in water by HR-CS-AAS. The reliability of the method was evaluated by experiments of precision, detection limit and recovery. Results The uniform furnace design was used to optimize the temperature program of graphite furnace. At 651.187 nm, the ashing temperature was 950 ℃ and the atomization temperature was 200 ℃. The linearity of F was within 50 ng. The recoveries of the standard samples of wastewater were 95.6% ~ 104%, all in the reference range, the relative standard deviations were 2.58% ~ 3.03%, and the detection limit was 42μg / L. Conclusion The uniform experimental design is suitable for multi-level and multi-factor experiments. The detection method is simple, rapid, accurate and sensitive and can be used as a reliable method for the determination of fluorine in water.