Microbial metabolism of N-nitrosodiethanolamine in lake water and sewage

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Abstract
The carcinogenic nitrosamine, N-nitrosodiethanolamine (NDElA), was degraded in samples of sewage and two lake waters, and microorganisms were responsible for the transformation. However, the rate of NDElA disappearance was slow. In the samples of lake water, the rate and extent of NDElA metabolism varied with the time of year, and no disappearance occurred in samples taken in winter. The products formed from NDEIA were persistent in lake water. In sewage, no seasonal effect on the microbial conversion was evident, and the products of metabolism were slowly mineralized. NDElA is apparently converted to the same organic products in samples of all three environments. Although the products were not identified, the data suggest that they were modified dimers of NDElA.

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