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The absence of formation of nitrosoamines under environmentally simulated conditions


, : The absence of formation of nitrosoamines under environmentally simulated conditions. Florida Scientist 55(3): 184-191

Studies of water chemistry in the Hillsborough River (Florida, USA) led to an examination of the factors that might lead to production of nitrosoamines under environmentally simulated conditions in the laboratory. Nitrosoamines were determined by means of a chemiluminescence-based technique providing determination of nitrosoamine plus nitrite concentrations. Subtraction of nitrite ion concentration gave total nitrosoamine concentrations. The components of the study system consisted of nitrate-nitrogen (70 ppb), Hillsborough River sediment, and chelated-copper herbicide (a commercially available ethanolamine derivative, 4 ppm), adjusted to pH 6.6 in aqueous phase. Nitrosoamine production was was observed at 25 degree C after about 10 days when all three components were present. No nitriate nor nitrosoamine formation was noted, or was below the sensitivity of the method (0.1 ng/sample), when chelated-copper was not present, when nitrate was not added to the system, or in the absence of sediment. The results indicate that the use of this chelated-copper herbicide does not lead to the formation of nitrosoamine under environmentally simulated conditions.

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