石墨炉法测定尿镉结果不确定度表达与分析  

Expression and evaluation of uncertainity of measured values of urine cadminium by using graphite furnace-AAS.

作　　者：黄振荣[1] 许艳芬[1] 张耀忠[1] 

机构地区：[1]江门市职业病防治所,广东江门529020

出　　处：《中国热带医学》2005年第3期562-564,共3页China Tropical Medicine

摘　　要：目的计算出尿镉测定值的不确定度与影响不确定度的因素。方法依据JJF059-1999《测量不确定度评定与表达》原理和方法计算尿镉测定值合成标准不确定度。结果尿镉含量X=(16.67±0.06)μg/L。其不确定度主要包括:①标准溶液浓度;②标准溶液稀释量具;③标准曲线方程;④重复测定相对不确定度;⑤检测仪器分辨率;⑥石墨炉法相对不确定度;⑦检样量取;⑧有效数字修约。结论全面反映检测全过程是质量控制的关键。Objective To estimate the uncertainty of measured values of urine cadmium and its influencing factors. Methods The uncertainty of the measured values of urine cadmium was calculated based on the principle and method for calculation of combined standard uncertainity document JJF059-1999 <Evaluation and expression of the uncertrainty of measurements>. Results The uncertainty may be expressed as X=(16.674±0.06)μg/L. Conclusion The major influencing factors may be ① concertration range of standard solutions;② diluting apparatus for standard solutions ;③precision of the calibration curve; ④ the relative uncertainty of repetitive measurements;⑤discrimination of the measuring instruments;⑥the relative uncertainty of graphite furnace method;⑦the measured sample size;⑧correction and revision of effective figures. All these factors may reflect the different key steps for quality control during the whole procedures of urine cadmium measurement.

关 键 词：石墨炉法 尿镉 不确定度 曲线方程 

分 类 号：O614.242[理学—无机化学]