运用线性拟合法评定水中总磷的测量不确定度  

Evaluating the Uncertainty in Measurement of Total Phosphorus in Water using the Linear Fitting Method

作　　者：王琳[1] 孙海容[2] 王岚云 孙培琴[2] 戴天有[3] 

机构地区：[1]天津市环境监测中心,天津300191 [2]中国合格评定国家认可中心,北京100062 [3]中国环境科学研究院,北京100012

出　　处：《环境监测管理与技术》2014年第5期50-52,共3页The Administration and Technique of Environmental Monitoring

摘　　要：采用Top-Down不确定度评定理念,利用实验室日常质控数据,结合标准样品的线性校准方法(线性拟合法),评定水中总磷的测量不确定度,并将评定结果与GUM评定法相比较,相对偏差≤20%。指出线性拟合法适用于测量系统校准函数成线性,且实验总残差符合常数剩余标准差假定情况下的不确定度评定。This paper adopt the new concept of uncertainty evaluation ＂Top-Down＂ , by means of laboratory daily quality control data combined with linear calibration method of reference materials （ linear fitting method） , to evaluate the uncertainty in measurement of total phosphorus in water. Comparing the evaluation results with GUM evaluation method, it showed that the comparison results＇relative standard deviation is less than 20%. It points out that the linear fitting method is suitable for the uncertainty evaluation of such assumptive cases that the calibration function of measurement system is linear, and the total residual error is accord with the residual stand- ard deviation of constant.

关 键 词：不确定度评定 TOP-DOWN 线性拟合法 总磷 水质 

分 类 号：X830.5[环境科学与工程—环境工程]