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目的为比较离子色谱法和离子选择电极法测定水氟盲样的结果差异有无统计学意义,分别使用两种方法对盲样进行氟化物含量测定,并将结果进行比较。方法采用国家标准GB/T5750.5-2006中的离子色谱法和离子选择电极法。结果两种方法的线性范围0.2 mg~3.0 mg/L,线性相关系数γ均大于0.999。精密度高,测定盲样和已知标准样品的精密度分别为0.44%、0.32%。两种方法经作配对t检验,测定结果无统计学意义,盲样测定结果比较(t=-1.86,P>0.05),已知标准样品测定结果比较(t=0,P>0.05)。结论两种方法均可检测生活饮用水及其水源水中可溶性氟化物,离子色谱法直接进样,操作简便、快速。
OBJECTIVE To compare the results of ion chromatography and ion-selective electrode for the determination of water-fluoride blind samples with or without statistical significance, two methods were respectively used to determine the fluoride content of blind samples and the results were compared. Methods Using the national standard GB / T5750.5-2006 ion chromatography and ion-selective electrode method. Results The linear range of the two methods was 0.2 mg ~ 3.0 mg / L, the linear correlation coefficient γ was greater than 0.999. The precision is high. The precision of measuring blind samples and known standard samples are 0.44% and 0.32% respectively. There was no significant difference between the two methods (t = -1.86, P> 0.05). The results of the known standard samples were compared (t = 0, P> 0.05). Conclusion Both methods can detect soluble fluoride in drinking water and its source water, and direct injection by ion chromatography is simple and rapid in operation.