The contribution of specific precursors to N-nitrosodimethylamine formation potential (NDMA FP) upon chloramination depends not only on their NDMA molar yields but also on their concentrations in the actual environment. We investigated the seasonal and diurnal patterns of the NDMA precursor N,N-dimethylformamide (DMF) and NDMA FP in the Yodo River basin, Japan, by examining water samples taken from inside the basin's largest sewage treatment plant (STP) as well as samples from five final effluents from four STPs, two main stream sites, and two tributary sites in the same basin. DMF and NDMA FP were found to be high in influent (raw sewage), and were found to be mostly removed during the STP treatment processes (especially with biological treatment). Nevertheless, DMF was found in concentrations of 0.06 to 31.7 µg/L in chlorinated effluents and in receiving rivers, while NDMA FP was detected in concentrations of 3.57 to 306 ng/L. Thus, STPs were shown to be an important source of DMF and NDMA FP to rivers. A strong positive correlation between NDMA FP and DMF was confirmed in the receiving river (K-M), indicating that DMF was an important NDMA precursor in the Yodo River basin. The contribution of DMF to NDMA FP was 15.8±11.2% (n = 4) in summer and 82.1±10.2% (n = 4) in winter in the main stream (site K-M) of the river due to insufficient dilution of chlorinated effluents from the largest STP. From the viewpoint of NDMA and NDMA FP control at downstream sites, monitoring and control of DMF at upstream sites are important.

特定前体对氯化时N-亚硝基二甲基胺形成潜力（NDMA FP）的贡献不仅取决于其NDMA摩尔产率，还取决于其在实际环境中的浓度。我们通过检查流域最大污水处理厂（STP）内部的水样以及样本，调查了日本淀川盆地NDMA前体N，N-二甲基甲酰胺（DMF）和NDMA FP的季节性和昼夜模式。来自同一污水处理厂的四个污水处理厂，两个主流站点和两个支流站点的五个最终废水。发现DMF和NDMA FP的进水量（原始污水）高，并且在STP处理过程中（尤其是生物处理）被发现大部分被去除。但是，发现DMF的浓度为0.06至31。氯化废水和接收河流中的浓度为7 µg / L，而NDMA FP的浓度为3.57至306 ng / L。因此，表明污水处理厂是河流中DMF和NDMA FP的重要来源。在接收河（KM）中证实了NDMA FP和DMF之间有很强的正相关性，这表明DMF是淀河盆地中重要的NDMA前兆。由于来自河流的氯化废水稀释不足，DMF对NDMA FP的贡献在夏季为15.8±11.2％（n = 4），在冬季为82.1±10.2％（n = 4）。最大的STP。从下游站点的NDMA和NDMA FP控制的观点来看，上游站点的DMF的监视和控制很重要。污水处理厂被证明是河流中DMF和NDMA FP的重要来源。在接收河（KM）中证实了NDMA FP和DMF之间有很强的正相关性，这表明DMF是淀河盆地中重要的NDMA前兆。由于来自河流的氯化废水稀释不足，DMF对NDMA FP的贡献在夏季为15.8±11.2％（n = 4），在冬季为82.1±10.2％（n = 4）。最大的STP。从下游站点的NDMA和NDMA FP控制的观点来看，上游站点的DMF的监视和控制很重要。污水处理厂被证明是河流中DMF和NDMA FP的重要来源。在接收河（KM）中证实了NDMA FP和DMF之间有很强的正相关性，这表明DMF是淀河盆地中重要的NDMA前兆。由于来自河流的氯化废水稀释不足，DMF对NDMA FP的贡献在夏季为15.8±11.2％（n = 4），在冬季为82.1±10.2％（n = 4）。最大的STP。从下游站点的NDMA和NDMA FP控制的观点来看，上游站点的DMF的监视和控制很重要。由于最大的污水处理厂对氯化废水的稀释不足，夏季主要河流（KM点）的夏季为2％（n = 4），冬季为82.1±10.2％（n = 4）。从下游站点的NDMA和NDMA FP控制的观点来看，上游站点的DMF的监视和控制很重要。由于最大的污水处理厂对氯化废水的稀释不足，夏季主要河流（KM点）的夏季为2％（n = 4），冬季为82.1±10.2％（n = 4）。从下游站点的NDMA和NDMA FP控制的观点来看，上游站点的DMF的监视和控制很重要。