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目的对N,N-二乙基对苯二胺分光光度法测定水中游离余氯不确定度进行评定。方法依据JJF 1059.1-2012要求,应用GB/T 5750.11-2006对水中游离余氯不确定度进行评定。结果置信概率为95%,k=2,扩展不确定度为0.0 090 mg/L,水中游离余氯含量为(0.090±0.0 090)mg/L。结论分析水中游离余氯测量不确定度影响因素对提高检测准确度具有现实意义。
OBJECTIVE To evaluate the uncertainty of determination of free residual chlorine in water by N, N-diethyl p-phenylenediamine spectrophotometry. Methods According to the requirements of JJF 1059.1-2012, the uncertainty of free residual chlorine in water was evaluated by GB / T 5750.11-2006. Results The confidence probability was 95%, k = 2, the extended uncertainty was 0.0 090 mg / L, and the residual free chlorine content in water was (0.090 ± 0.0 090) mg / L. Conclusion It is of practical significance to analyze the influencing factors of the measurement uncertainty of free residual chlorine in water to improve the detection accuracy.