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与河流沉积物中重金属的地化学丰富相关的以来源为导向的生态和抗体风险

Zhimin Yang¹, Chunhui Li¹, Haiyang Chen²

¹Key Laboratory for Water and Sediment Sciences of Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China.

|June 11, 2023

概括

河流中的重金属带来了生态和耐药性风险. 这项研究制定了一个框架,以确定污染源并评估它们的具体风险,揭示了工业排放是重金属污染的一个主要问题.

科学领域:

环境化学环境化学
生态毒理学生态毒理学
环境微生物学环境微生物学

背景情况:

水生系统中的重金属 (HM) 存在重大生态和耐药性风险.
有效的风险减轻需要了解HM来源及其对环境危害的具体贡献.
现有的研究往往缺乏对与地化学HM丰富相关的源特异性生态和抗体风险的全面评估.

研究的目的:

开发和应用一个综合框架来描述河流沉积物中HM的源向生态和抗体风险.
识别和量化各种来源对HM污染的贡献.
评估与特定的HM源相关的生态风险及其对抗生素耐药性基因 (ARG) 的影响.

主要方法:

地质化学分析以确定HM污染水平 (Cd,Hg).
使用正矩阵分解 (PMF) 和不混合模型进行比较的源分配.
将来源分配结果整合到修改后的生态风险指数中.
高通量测序元基因组学以识别ARG.
网络和统计分析以将HM与ARG相关联.

主要成果:

(Cd) 和 (Hg) 的污染水平最高,分别超过了背景值的19.7倍和7.5倍.
工业排放 (32.3-37.0%) 和农业活动 (8.0-9.0%) 被确定为HMs的主要人为来源.
人类源对生态风险做出了重大贡献,工业排放对Cd.构成高至极高风险.
在地化学HM丰富和ARG的丰富性/多样性之间发现了强烈的相关性 (ρ > 0.8;P < 0.01) ,包括碳烯耐药性和mcr型基因.

结论:

综合框架有效地描述了河流沉积物中HM的源特异性生态和抗体风险.
工业排放和农业活动是推动重金属污染相关的生态风险的关键来源.
地化学丰富HM显著影响水生耐药性,突显金属和抗生素耐药性污染的相互联系.
这些发现为全球水生环境的有针对性的污染控制和风险管理策略提供了关键的见解.

关键词:

抗生素耐药性风险抗生素耐药性风险环境法医模型.重金属是一种重金属.河流沉积物的沉积物来源分配的分配方式源特异性的生态风险源特异性的生态风险

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