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| - UV Photolytic Mechanism ofN-Nitrosodimethylamine in Water: Dual Pathways to Methylamineversus Dimethylamine
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| - The direct ultraviolet (UV) photolysis of N-nitrosodimethylamine (NDMA), a well-known potential carcinogen, wasinvestigated in aqueous solution with its degradation productsanalyzed quantitatively. NDMA is known to be photolyzedeither to dimethylamine (DMA) or to methylamine (MA)by two distinct pathways. However, the mechanism throughwhich NDMA is photolyzed to DMA is still not clearlyunderstood. This study reveals a new mechanistic pathwayof NDMA photolysis to DMA by identifying the factorsinfluencing the photolysis pathway. The two pathways ofNDMA photolysis were found to be strongly dependent onthe initial NDMA concentration and solution pH. Increasingthe initial NDMA concentration clearly favored theDMA formation path. DMA production was optimized inthe region of pH 4−5. The nitrite ion (NO2-) produced fromthe NDMA photolysis was identified as a key reagent indirecting the NDMA photolysis toward DMA production. Theobserved photolytic behaviors of NDMA photolysis couldbe successfully explained in terms of the new mechanisminvolving the role of NO2-.
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