Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
Int J Environ Res Public Health. 2022 Mar 31;19(7):4151. doi: 10.3390/ijerph19074151.
Organic nitrogen (ON) is an important part of atmospheric nitrogen deposition, but the content and distribution of components other than urea and amino acids are the blind area of current research. The deposition of organic amines (OA) in strategic water sources poses a great public health risk to unspecified populations. In order to further reveal the composition of about 50% soluble organic nitrogen, besides urea and amino acids, five functional sampling points (such as industrial area, agricultural area, urban area, tourism area and forest area) were set in the reservoir area to detect dissolved total nitrogen (DTN), dissolved organic nitrogen (DON) and OA components. The results show that the total nitrogen concentration was 6.42-10.82 mg/m and the DON concentration was 2.77-4.99 mg/m. Ten kinds of OA were detected: dimethylamine (DMA), diethylamine (DEA), propylamine (PA), butylamine (BA), pyrrolidine (PYR), dibutylamine (DBA), N-methylaniline (NMA), 2-ethylaniline (2-ELA), benzylamine (BMA), and 4-ethylaniline (4-ELA). The average concentrations were 7.64, 26.35, 14.51, 14.10, 18.55, 7.92, 10.56, 12.84, 13.46 and 21.00 ng/m, respectively. The total concentration of ten OA accounted for 2.28-9.81% of DON in the current month, of which the content of DEA was the highest, reaching 0.71%, the content of 4-ELA, PYR, PA and BA was 0.4-0.56%, and the content of DMA, DBA and NMA was 0.2-0.36%. The sources of OA in the reservoir area have significant seasonal differences. The content is the highest in spring, followed by autumn, and lower in summer and winter. The rainfall in spring and autumn is small, the source of road dust is relatively high, and the rainfall in summer is large. After the particles in the air are washed by rain, the concentration of OA in the sample is the lowest. On account of spring and autumn being the time of frequent agricultural activities, the concentration of OA is significantly higher than that in winter and summer.
有机氮（ON）是大气氮沉降的重要组成部分，但除尿素和氨基酸以外的成分的含量和分布是当前研究的盲区。有机胺（OA）在战略水源地的沉积对未指定人群构成了巨大的公共健康风险。为了进一步揭示除尿素和氨基酸以外约 50%可溶性有机氮的组成，在库区设置了 5 个功能采样点（如工业区、农业区、城区、旅游区和林区），以检测溶解总氮（DTN）、溶解有机氮（DON）和 OA 成分。结果表明，总氮浓度为 6.42-10.82mg/m，DON 浓度为 2.77-4.99mg/m。共检测到 10 种 OA：二甲胺（DMA）、二乙胺（DEA）、正丙胺（PA）、正丁胺（BA）、吡咯烷（PYR）、二丁胺（DBA）、N-甲基苯胺（NMA）、2-乙基苯胺（2-ELA）、苄胺（BMA）和 4-乙基苯胺（4-ELA）。平均浓度分别为 7.64、26.35、14.51、14.10、18.55、7.92、10.56、12.84、13.46 和 21.00ng/m。当月，10 种 OA 总浓度占 DON 的 2.28-9.81%，其中 DEA 含量最高，达 0.71%，4-ELA、PYR、PA 和 BA 含量为 0.4-0.56%，DMA、DBA 和 NMA 含量为 0.2-0.36%。库区 OA 的来源具有显著的季节性差异。春季含量最高，其次是秋季，夏季和冬季含量较低。春季和秋季降雨量较小，道路扬尘源相对较高，夏季降雨量较大。空气颗粒经雨水冲刷后，样品中 OA 的浓度最低。考虑到春季和秋季是农业活动频繁的时期，OA 的浓度明显高于冬季和夏季。
