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Biodegradation is generally recognised as an important removal mechanism for pollutants in natural ecosystems. It determines the concentration of substances in the environment. According to the legislation of the European Union, there are three levels for biodegradability testing protocols for chemicals which cover different test conditions. This paper describes one such multilevel approach to biodegradation testing. Four different tests were performed on diethylene glycol and phenol.pmid:14677366 fatcat:zumze5p2rrgedh4qjijwa5puw4