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ACCURACY OF LABORATORY REPORTING IN EPAS WET INTERLABORATORY VARIABILITY STUDY
Citation:
Brent, R. N., J. Reemelin, W. A. Telliard, AND T J. NorbergKing. ACCURACY OF LABORATORY REPORTING IN EPAS WET INTERLABORATORY VARIABILITY STUDY. Presented at SETAC Annual Meeting, Baltimore, MD, November 11-15, 2001.
Description:
In 1999 and 2000, EPA conducted an interlaboratory variability study of whole effluent toxicity (WET) test methods. This study provided an excellent opportunity to evaluate the accuracy with which laboratories analyzed and reported WET test data. Twenty-eight laboratories reported fathead minnow chronic test results for 105 samples, and 35 laboratories reported Ceriodaphnia dubia chronic test results for 126 samples. - - - While over half of test results were subject to one or more errors, only 3% to 32% of results (depending on the endpoint) were affected by the errors and differed when recalculated by SCC. Differences between laboratory-reported and SCC-recalculated results ranged from 0.1% to 100%.