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Nonylphenol (NP) and the 9-mole ethoxylate of nonylphenol (NPE9) were synthesized with a uniform radioactive 14C label in the aromatic ring. The [14C]NP isomer distribution and [14C]NPE9 oligomer distribution closely matched that of commercial NPE9. Biodegradation of [14C]NPE9 was examined under conditions simulating a river water environment, and changes in the oligomer distribution and mineralization...
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