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Journal of the Korean Society for Environmental Analysis 2015;18(1):59-66.
Evaluation Criteria for Proficiency Testing in Environmental Samples of Water, Drinking Water, Waste and Soil Field
환경숙련도 시험에서의 평가기준 설정
김명옥, 정인영, 이혜리, 김금희, 최성헌, 이두희, 이원석, 최종우, 권오상
국립환경과학원
Abstract
This study was performed in order to establish a reasonable assigned value and target standard deviation invarious matrices from proficiency test results. RPDs between manufactured PT sample concentrations androbust or normal averages were lower than 5% in almost all items except in water, drinking water, waste andsoil and 5% to 9.5% in organic solvents and organo-phosphate pesticides. Robust averages and robust standarddeviations from 2002 to 2012 were calculated and Coefficient of variation (CV) was used as statistical toolsto find the target standard deviation in each fields. As a result, CV of all items except mercury and arsenicshowed less than 10% in water and drinking water fields. CV of mercury and arsenic was less than 20%. Mostitems of heavy metal in waste and soil showed less than 15%. Therefore, it is determined to be reasonable thatthe standard deviation of future itemized goal is calculated by multiplying the coefficient of variation of thestatistical processing results during 11 years. These results will contribute to providing reliable evaluation criteriaand relevant information when establishing the PT evaluation guidelines according to ISO 17043 in various fields.
Key Words: Proficiency testing, Coefficient of variances, RPDs, ISO17043
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