邻苯二甲酸酯在三峡库区消落带非淹水期土壤中污染特征及健康风险

发布时间：2019-02-13 08:29

【摘要】：本研究利用超高效液相色谱飞行时间质谱(UPLC-Q-TOF~-MS)分析了三峡库区8个消落带河段土壤样品中邻苯二甲酸酯(PAEs)的浓度水平,探讨了其组成特征,通过相关性分析和主成分分析阐明了其可能的来源,并且采用健康风险模型评价了PAEs在消落带土壤中的人群健康风险.结果表明,ΣPAEs在三峡库区消落带的含量(以干重计,下同)范围为322.0~737.3 ng·g~(-1),平均值为497.2 ng·g~(-1),处于文献报道的较低水平;DIBP是丰度最高的同系物单体,其次是DBP和DEHP,三者平均贡献率为94.5%,然而DEHP并不是主要污染物,这可能由于在淹水状态下消落带土壤向水体释放DEHP,但DEHP在土壤微生物中降解也不能完全排除;DMP、DEP、DBP和DIBP两两之间具有极显著正相关性,同时结合主成分分析,表明4种PAEs可能具有相同来源.人群暴露6种PAEs的日均摄入量均未超过美国EPA规定的参考剂量(Rf D),并且6种PAEs单体的致癌风险均远低于美国EPA规定的可接受致癌风险值,但是DBP的日均摄入量占总PAEs的60%~84%,因此,在三峡库区消落带耕作过程中应预防DBP带来的潜在健康风险.
[Abstract]:In this study, the concentration levels of phthalate (PAEs) in soil samples from 8 river sections in the three Gorges Reservoir area were analyzed by ultra-high performance liquid chromatography-time-of-flight mass spectrometry (UPLC-Q-TOF~-MS), and their composition characteristics were discussed. The possible sources of PAEs were elucidated by correlation analysis and principal component analysis, and the population health risk of PAEs was evaluated by health risk model. The results show that the 危 PAEs content in the three Gorges reservoir area is in the range of 322.0773. 3 ng g ~ (-1), with an average value of 497.2 ng g ~ (-1), which is lower than that reported in the literature. DIBP is the most abundant homologue monomer, followed by DBP and DEHP, with an average contribution rate of 94.5. However, DEHP is not a major pollutant, which may be due to the release of DEHP, to water from the soil in the declination zone under flooded conditions. However, the degradation of DEHP in soil microorganisms could not be completely excluded. There was a significant positive correlation between DMP,DEP,DBP and DIBP. Combined with principal component analysis, it was suggested that the four kinds of PAEs might have the same source. The daily intake of six PAEs was not higher than the reference dose of (Rf D), prescribed by EPA in the United States, and the carcinogenic risk of the six PAEs monomers was significantly lower than the acceptable risk of carcinogenesis specified by EPA in the United States. However, the daily intake of DBP accounts for 60% of total PAEs. Therefore, the potential health risk caused by DBP should be prevented in the process of cultivation in the collapse zone of the three Gorges Reservoir area.
【作者单位】：西南大学资源环境学院;重庆市农业资源与环境研究重点实验室;
【基金】：国家自然科学基金项目(41403078) 中央高校基本科研业务费专项(XDJK2016B042,XDJK2017E203) 重庆市基础科学与前沿技术研究专项(cstc2016jcyj A0399)
【分类号】：X53

【相似文献】