| 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 |
| 摘要点击 2015 全文点击 665 投稿时间：2017-03-20 修订日期：2017-04-24 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 三峡库区消落带 土壤 邻苯二甲酸酯 污染特征 相关性 健康风险 |
| 英文关键词 fluctuating zone of the Three Gorges Reservoir soil phthalate esters pollution characteristics correlation health risk |
|
| 中文摘要 |
| 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，∑PAEs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（RfD），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. |
| 英文摘要 |
| Soil samples were collected in the fluctuating zone of the Three Gorges Reservoir to analyze the concentrations and distribution of phthalate esters (PAEs) using ultra performance liquid chromatography-quadrupole-time of flight mass spectrometry (UPLC-Q-TOF-MS). Meanwhile, the interrelationships among the PAE congeners were analyzed and the potential sources of PAEs in soil were determined by the correlation analysis and principal component analysis. The results showed that the concentrations of ∑PAEs ranged from 322.0-737.3 ng·g-1 dry weight, with a mean value of 497.2 ng·g-1 dry weight, which lies at the low end of the worldwide Figures. DIBP was the most abundant PAEs congener, followed by DBP and DEHP, contributing to 94.5% of the total PAEs. However, DEHP was not the main pollutant in this study compared to other studies, which might be ascribed to the release of DEHP from the flooded soil to the surrounding water but the degradation by microorganisms in the soil cannot be completely ruled out. Significant interrelationships were observed among DMP, DEP, DBP, and DIBP. The principal component analysis showed that DMP, DEP, DBP, and DIBP may have similar sources. In this study, the daily intake dose was lower than the reference dose (RfD) proposed by the United States Environmental Protection Agency (USEPA), and the carcinogenic risk of six PAE congeners was far below the tolerable values proposed by the USEPA. Nevertheless, the daily intake dose of DBP accounted for 60% to 84% of total PAEs; thus, more attention should be paid to the potential health risks of DBP. |
|
|
|
