ASSESSMENT OF PRECISION OF A PASSIVE SAMPLER BY DUPLICATE MEASUREMENTS

摘要

Duplicate measurement is a common method to determine precision of a sampling method in an air pollution field study. Several evaluating measures for the precision of the sampling method are explored with duplicate measurements of two types of passive samplers, such as nitrogen dioxide diffusive badge and carbon monoxide passive sampler. Presentation of duplicates in a graph as one of the evaluating measures can be affected by different assignment of each measurement to vertical and horizontal axes. Although absolute difference or relative error among duplicates can quantitatively represent the precision, interpretation of these values depends on the measured concentration range. Intraclass correlation coefficient, often used for an indicator of the reliability of measurements, is an appropriate statistical measure to present a relative similarity of duplicate measurements. Intraclass correlation coefficient is an appropriate way to indicate precision of passive samplers which is usually determined by duplicate field measurements in air pollution studies.