| 邻苯二甲酸酯在重庆市城市土壤中的污染分布特征及来源分析 |
| 摘要点击 1800 全文点击 573 投稿时间：2017-11-10 修订日期：2017-12-22 |
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| 中文关键词 城市功能区 土壤 邻苯二甲酸酯 污染特征 相关性 |
| 英文关键词 urban functional areas soil phthalate esters pollution characteristics correlation |
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| 中文摘要 |
| 本研究在重庆市5个不同城市功能区采集了共66个土壤样品，并利用超高效液相色谱飞行时间质谱（UPLC-Q-TOF-MS）对土壤中邻苯二甲酸酯（PAEs）的含量水平和组成特征进行了探讨.此外，通过相关性分析和主成分分析阐述了PAEs可能的来源.结果表明，∑PAEs在5个不同功能区的含量（以干重计，下同）范围为93.1~312 ng·g-1，处于国内外较低水平.邻苯二甲酸二（2-乙基己基）酯（DEHP）、邻苯二甲酸正二丁酯（DBP）和邻苯二甲酸二异丁酯（DIBP）是3种主要污染物，三者的平均含量贡献率范围是87.4%~92.9%，而DEHP作为丰度最高的PAEs单体其平均贡献率达到了52.4%.通过相关性分析发现分子质量相近的PAEs单体之间更易呈现极显著关系（P<0.01），表明这些单体可能具有相似的来源.主成分分析进一步表明DEHP、DBP和DIBP具有相似来源而BBP和DnOP也具有相似来源.与其他研究相比，尽管本研究中PAEs含量处于较低水平，但仍需预防其对环境和人体的潜在风险. |
| 英文摘要 |
| In total, 66 soil samples were collected from five different urban functional areas in Chongqing, and the concentration levels of phthalate esters (PAEs) were analyzed using ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS). Meanwhile, the composition and characteristics of PAEs were discussed, along with their possible sources, through correlation analysis and principal component analysis. The results showed that the concentrations of ∑PAEs ranged from 93.1-312 ng·g-1 dry weight, which is at the low end of the worldwide figure. DEHP, DBP, and DIBP were the dominant compounds, contributing 87.4%-92.9% of the total ∑PAEs. DEHP was the most abundant PAE congener, responsible for 52.4% of the total ∑PAEs. Through correlation analysis, it was noted that PAEs with similar molecular weight were more likely to show a significant relationship with each other, which suggested that these PAEs may share a similar source. According to the principal component analysis, DBP, DIBP, and DEHP had a similar source, while BBP and DnOP strongly correlated with each other. Compared to other studies, relatively low PAE concentrations were apparently observed in this study, but the potential human risk via exposure to these compounds should also been considered. |
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