Nitrate, Nitrite and Dimethylamine Contents in Cow and Human Milk, and Water
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概要
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Cow milk, human milk and water in several areas in Hokkaido were analyzed for nitratenitrogen (NO<SUB>3</SUB>-N) by the cadmium column method, nitrite-nitrogen (NO<SUB>2</SUB>-N) by the diazocoupling reaction method and dimethylaminenitrogen (DMA-N) by the Cu-dithiocarbamete method.<BR>Average content of NO<SUB>3</SUB>-N in 380 samples of cow milk was 0.1ppm and NO<SUB>2</SUB>-N was undetected (under the limit of 0.01ppm), but high NO<SUB>3</SUB>-N levels (0.05-9.57ppm) and NO<SUB>2</SUB>-N levels (0.01-0.47ppm) were found in human milk especially in colostrum. The ground water contained higher amount of NO<SUB>3</SUB>-N and NO<SUB>2</SUB>-N than the city water.<BR>The DMA-N contents in cow and human milk were of trace level.
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