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Schimmel, Steven C. and Richard L. Garnas. 1981. Results: Interlaboratory Comparison-Bioconcentration Tests Using the Eastern Oyster. EPA-600/4-81-011. U.S. Environmental Protection Agency, Environmental Research Laboratory, Gulf Breeze, FL. 199 p. (Avail. from NTIS, Springfield, VA: PB82-194689)

This report summarizes the results of an interlaboratory comparison for bioconcentration (BCF) testing using the eastern oyster (Crassostrea virginica) and the organic chemicals p,p'-DDE, 1,2,4-trichlorobenzene, and pentachlorophenol. The mean BCF's and high to low BCF ratios for p,p'-DDE, 1,2,4 trichlorobenzene, and pentachlorophenol were 52,600 (3.4), 168 (2.3), and 64 (2.4), respectively. The test method (ASTM Draft 9) used for all three chemicals and four participating laboratories resulted in data with a mean to low BCF ratio of 2.7, which represented a 'worse case' situation for an estimate of variability. Considering the varying degrees of experience between participants in conducting BCF tests, the wide geographic distribution between participants, and the different dilution water characteristic, the results were remarkably reproducible.

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