太湖流域典型城镇水环境芳香胺类污染特征

Characterization of aromatic amines pollutants in the typical town of the Taihu Watershed

利用固相萃取-气相色谱/串联质谱法(SPE-GC-MS/MS),对太湖流域上游城镇常州武南地区的地表水体和典型排放源中的4种芳香胺类污染物(AAs)进行连续2年监测,综合分析了2018~2019年间AAs的污染及浓度特征.结果表明,武南地区河网中目标AAs的总浓度范围为<LOQ~2.39μg/L,年平均浓度为0.323μg/L,丰水期浓度高于枯水期,冬季浓度最低,苯胺和邻甲苯胺是主要检出成分.空间分布结果表明武南地区东北部及中部地区污染程度较高.各排放源样品中,除市政污水处理厂出水外,AAs的浓度均大于地表水,与地表水季节变化具有一致性,污染物在丰水期输入地表水强度较大.初步生态风险评价结果表明研究区域地表水中苯胺和间甲苯胺具有较为高的生态风险.研究结果对加强太湖流域水体中芳香胺类污染物的治理及水源地保护提供了数据支撑.

Four aromatic amines(AAs)were determined by solid phase extraction and gas chromatography-tandem mass spectrometry(SPE-GC-MS/MS)in surface water and typical emission sources samples from Wunan District of Changzhou,a Taihu Basin upper-reach city continuously during 2018 to 2019.Results showed that overall concentrations of AAs were in the rage of<LOQ~2.39μg/L and annual average concentration was 0.323μg/L.Higher contamination levels were found in wet seasons than dry seasons,and lowest concentration level was observed in winter.The prevalent contaminants of AAs were aniline and o-toluidine.Spatial distribution revealed the northeast and the midlands were polluted regions.Concentrations of AAs in emission sources samples except the municipal effluent were all higher than those in surface water,and the seasonal variation patten was similar to that in the surface water-high loads of pollutants entered into the surface water during the flood season.The preliminary risk quotient method indicates aniline and m-toluidine had high risk levels.The research will provide support for improving the management of AAs and safeguard drinking water quality in Taihu watershed.