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目的分析离子色谱法测定水中二氯乙酸不确定度的来源,建立离子色谱测定法的不确定度评价方式。方法按照测量不确定度的评定原理,确定不确定度的来源,计算出合成标准不确定度和绝对扩展不确定度。结果水样中二氯乙酸的浓度为0.107mg/L时,其绝对扩展不确定度为0.004mg/L,k=2。结论该报告方法在实际工作中有较强的参考价值。
OBJECTIVE: To analyze the source of uncertainty for determination of dichloroacetic acid in water by ion chromatography and establish the evaluation method of uncertainty for ion chromatography. Methods According to the evaluation principle of measurement uncertainty, the source of uncertainty was determined and the composite standard uncertainty and absolute expansion uncertainty were calculated. Results When the concentration of dichloroacetic acid was 0.107mg / L in water sample, its absolute expansion uncertainty was 0.004mg / L, k = 2. Conclusion The report method has strong reference value in practical work.