Abstract
A correlation study of biodegradability determinations was started previously by testing 44 compounds covering a range of physical, chemical, and biological properties in seven tests (the coupled units test, i.e., the modification of the OECD Confirmatory Test for the application of the carbon analysis, the Zahn-Wellens, the Japanese MITI, the French AFNOR T 90-302, the Sturm, the Modified OECD Screening, and the Closed Bottle Test according to Fischer). The individual tests were characterized by comparing their results with those obtained in the others. Two further tests were included in the present part of the study: The U.S. EPA Activated Sludge Test and a model trickling filter. Furthermore, more in-depth characterizations of the various tests were achieved by transinoculation experiments: Typically, if a compound was degraded in one test but failed in another, the first was used as a preacclimation procedure for the second. The concept of the OECD Expert Group “Degradation/Accumulation” of a set of tests for the determination of “ready biodegradability” could be confirmed on an experimental basis.
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