Naylor CG, Staples CA, Klecka GM, Williams JB, Varineau PT, Cady C. Biodegradation of [(14)C] ring-labeled nonylphenol ethoxylate.
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2006;
51:11-20. [PMID:
16485172 DOI:
10.1007/s00244-005-0100-1]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2005] [Accepted: 10/03/2005] [Indexed: 05/06/2023]
Abstract
Nonylphenol (NP) and the 9-mole ethoxylate of nonylphenol (NPE9) were synthesized with a uniform radioactive (14)C label in the aromatic ring. The [(14)C]NP isomer distribution and [(14)C]NPE9 oligomer distribution closely matched that of commercial NPE9. Biodegradation of [(14)C]NPE9 was examined under conditions simulating a river water environment, and changes in the oligomer distribution and mineralization to (14)CO(2) were monitored for 128 days. Over 40% of the [(14)C]NPE aromatic ring carbon was converted to (14)CO(2) and another 21% was incorporated into the biomass. Primary degradation of NPE (conversion to metabolites other than NP, NPE ethoxylates, and NPE carboxylates) was estimated to be 87-97%. NP was a minor metabolite, accounting for less than 0.4% of the initial NPE. These studies demonstrate that the phenolic ring of NPE is opened, metabolized, and mineralized in the aquatic environment.
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