J Korean Soc Environ Anal Search


Journal of the Korean Society for Environmental Analysis 2018;21(1):34-40.
Proficiency Testing of Heavy Metals (Cr, Ba) in Water
수질 중 중금속(Cr, Ba) 숙련도 시험 평가
송대성1, 이정엽1, 이종운2, 서대근1, 최재원3, 김윤석3
3한국수자원공사 수자원연구원
In this study, the analytical techniques of 51 domestic and international institutions were assessed based on the proficiency testing of heavy metals. The proficiency testing samples that were prepared and distributed for this study were barium and chromium, of which their homogeneity and stability in water were ensured. Thirtyeight institutions and 45 institutions participated and submitted their results obtained from the analysis of barium and chromium, respectively. A statistical assessment on the proficiency test was conducted on the basis of the z-score and the results obtained are as follows: for barium, 1 institution was assessed as unsatisfactory and 6 as doubtful, and for chromium, 6 were assessed as unsatisfactory and 4 as doubtful. The testing institutions that had doubtful or unsatisfactory results need to consider the cause of causal analysis inaccuracies, including reference materials, glassware, inspection of the testing equipment and recalibration, test procedure reviews, tester training, and continuous participation in proficiency tests of relevant areas in order to promote efforts for improving and taking preventive measures for performance improvement.
Key Words: Proficiency testing, Chromium, Barium, Homogeneity, Stability
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