线性拟合法评定水中总有机碳的测量不确定度  

Uncertainty in Total Organic Carbon Measurement by Linear Fitting

作　　者：常继兵 CHANG Jibing(Wuhan Kexiang analysis and Detection Technology Co.,Ltd.,Hubei Wuhan 430075,China)

机构地区：[1]武汉科想分析检测技术有限公司,湖北武汉430075

出　　处：《广州化工》2025年第3期99-101,共3页GuangZhou Chemical Industry

摘　　要：总有机碳是指溶解或悬浮在水中有机物的含碳量,是以含碳量表示水体中有机物总量的综合指标。通过建立燃烧氧化-非分散红外吸收法测定水中总有机碳含量的标准曲线,采用线性拟合法,对水中总有机碳的测定进行不确定度评定。建立常数模型假定,利用日常检测中方法区间6个赋值(RQV)的浓度水平,通过失拟误差检验和后续测定的变换和控制限,进行不确定度的评定。结果表明,当k=2时,总有机碳的不确定度为0.84 mg/L。掌握基于质控数据水中总有机碳测量不确定度的线性拟合法评定方法,能与实验室内部质量控制相结合,与其它不确定度评定方法相比,无需增加额外工作量,具有数据来源支撑基础,评定时效快和应用广的特点。Total organic carbon(TOC)refers to the carbon content of dissolved or suspended organic matter in water.The standard curve of total organic carbon(TOC)in water was established by the combustion oxidation-non-dispersive infrared absorption method.A constant model was established,aiming to evaluate the uncertainty.Specifically,the uncertainty was evaluated using the concentration level of 6 RQV within the routine detection interval.This was achieved through testing the misfit error(which should be defined more precisely in the context)and analyzing the transformation and control limit of the follow-up measurement.The results showed that the uncertainty of TOC was 0.84 mg/L when k=2.Mastering the evaluation method of uncertainty in the measurement of total organic carbon in water based on quality control data can be integrated with the internal quality control in the laboratory.Compared with other uncertainty evaluation methods,it had the characteristics of reliable data source support,fast evaluation speed,and wide applicability,without imposing additional workload.

关 键 词：不确定度 线性拟合法 总有机碳 

分 类 号：O661.1[理学—分析化学] X832[理学—化学]