在混合之前,重新考虑大水库中的陆地溶解有机物:将光降解和生物降解以及氨酸结合行为联系起来
Yupeng Wu1, Xueshuai Zhang2, Rong Hao1
1State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
The Science of the total environment
|September 6, 2023
概括
在水库中,陆地溶解有机物 (DOM) 通过光降解和生物降解转化,影响水质和污染物结合. 土壤DOM比植被DOM更为关键,用于预测来自疏水性有机化合物 (HOC) 的生态风险.
科学领域:
- 环境化学环境化学
- 生物地质化学生物地质化学
- 生态毒理学 生态毒理学
背景情况:
- 陆地溶解有机物 (DOM) 对水库水质,生态功能和污染物运输至关重要.
- 堤建设增加了陆地DOM输入,需要了解它的命运和影响.
研究的目的:
- 通过光降解和生物降解研究水库中土壤和植被DOM的转变.
- 评估这些转化对氨酸结合和生态风险的影响.
主要方法:
- 研究了土壤和植被DOM的光降解和生物降解.
- 分析了DOM度,染色体和光的变化.
- 研究了对氨酸结合亲和力的影响.
主要成果:
- 光降解和生物降解都显著降低了DOM度.
- 光降解导致的光漂白比光矿化更多.
- 光降解产生了低分子量,低芳香度的副产品;生物降解产生了低分子量,高芳香度的副产品.
- 这两种过程都增强了烯的结合,土壤DOM显示出更大的影响.
结论:
- 在混合之前,陆地DOM在水库中经历了显著的转化.
- DOM转换改变了它的特性,并增强了疏水性有机化合物 (HOC) 的结合.
- 土壤DOM在评估水库中的HOC生态风险方面比植被DOM更为优先.
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