Occurrence and formation potential of N-nitrosodimethylamine in ground water in Tokyo

n -亚硝基二甲胺（NDMA）是水处理过程中的消毒副产物，是一种强致癌物。研究了东京地区地下水和河水中铅的赋存状态和形成潜力。分析了它们在渗透过程中的行为。地下水中NDMA浓度略低于或与河水相当，而地下水中NDMA前体浓度显著低于河水。部分NDMA前体具有持久性，但大部分由于降解和/或吸附而被土壤去除，表明NDMA前体浓度在入渗过程中会降低。

N-nitrosodimethylamine(NDMA), a disinfection byproduct of water treatment processes, is a potent carcinogen. Its occurrence and formation potential in ground water and river water in Tokyo are investigated. Their behavior during infiltration is also analyzed. NDMA concentrations in ground water were slightly lower than or comparable to those in river water, whereas NDMA precursor concentrations in ground water were significantly lower than those in river water. Some parts of NDMA precursors were persistent but most of them were removed by soils owing to degradation and/or adsorption, suggesting NDMA precursor concentrations can decrease during infiltration.