Multi N/C 2100S直接法测量总有机碳的不确定度评定

摘要

According to the Water quality-Determination of total organic carbon-Combustion oxidation nondispersive infrared absorption method(HJ 501-2009), wedetermined the total organic carbon (TOC) concentration in real water samples and analyzed the factors that affect the determination uncertainty using the TOC water quality analytical apparatus of Multi N/C 2100S of Analytik Yena.The main factors were as follows: standard solution and calibration series configuration, the regression curve, sample repeatability test, total organic carbon in water quality analyzer.Based on this, the uncertainty of measurement was evaluated and measured: the expanded uncertainty was 0.24 mg/L when the concentration of TOC was 8.54 mg/L according to the standard of JJF 1059-2012.The above results provided a theoretical basis for the accurate determination of total organic carbon.%使用德国耶拿仪器公司Multi N/C 2100S总有机碳水质分析仪,依据《水质 总有机碳的测定 燃烧氧化-非分散红外吸收法》(HJ 501-2009),测定了实际水样中总有机碳含量,分析了影响结果的不确定度来源主要有标准溶液及校准系列配置、回归曲线、试样重复性试验、总有机碳水质分析仪,在此基础上对测量结果进行了不确定度评定:当TOC浓度为8.54 mg/L时,其扩展不确定度为0.24 mg/L,并根据JJF 1059-2012给出了标准的表示法.上述结果可为准确测定总有机碳提供理论依据.