Higuchi T
Department of Sustainable Environmental Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
Water Sci Technol. 2009;59(7):1409-13. doi: 10.2166/wst.2009.108.
Estimation of uncertainty in odour measurement is essential to the interpretation of the measurement results. The fundamental procedure for the estimation of measurement uncertainty comprises the specification of the measurement process, expression of the measurement model and all influences, evaluation of the standard uncertainty of each component, calculation of the combined standard uncertainty, determination of a coverage factor, calculation of the expanded uncertainty and reporting. Collaborative study such as interlaboratory comparison of olfactometry yields performance indicators of the measurement method including repeatability and reproducibility. Therefore, the use of collaborative test results for measurement uncertainty estimation according to ISO/TS 21748 and ISO 20988 is effective and reasonable. Measurement uncertainty of the triangular odour bag method was estimated using interlaboratory comparison data from 2003 to 2007 on the basis of the simplest model of statistical analysis, and the expanded uncertainty of odour index ranged between 3.1 and 6.7. On the basis of the establishment of the estimation procedure for uncertainty, a coherent interpretation method for the measurement results will be proposed and more effective and practical quality control of olfactometry will be available.
气味测量不确定度的评估对于测量结果的解释至关重要。测量不确定度评估的基本程序包括测量过程的规范、测量模型及所有影响因素的表述、各分量标准不确定度的评估、合成标准不确定度的计算、覆盖因子的确定、扩展不确定度的计算以及报告。诸如嗅觉测定法的实验室间比对等协作研究可得出测量方法的性能指标，包括重复性和再现性。因此，根据ISO/TS 21748和ISO 20988使用协作测试结果进行测量不确定度评估是有效且合理的。基于最简单的统计分析模型，利用2003年至2007年的实验室间比对数据估算了三角气味袋法的测量不确定度，气味指数的扩展不确定度在3.1至6.7之间。在建立不确定度评估程序的基础上，将提出一种对测量结果的连贯解释方法，并可实现更有效、实用的嗅觉测定法质量控制。
