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有机物质含量,来源和组成因季节和人为活动而变化,调节黄河中甲基的动态

Xiaoquan Liu¹, Yingjun Wang¹, Xiaomeng Ji¹

¹Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, China.

Environmental pollution (Barking, Essex : 1987)

|March 14, 2025

概括

黄河中的有机物质会影响甲基 (MeHg) 的含量. 雨季显示集水区的MeHg输入,而干季则表明现场生产,水沉积物调节事件增加了MeHg.

科学领域:

环境化学环境化学
河流生态系统河流生态系统
水银生物地质化学水银生物地质化学

背景情况:

有机物 (OM) 显著影响河流中的甲基 (MeHg) 动态.
了解MeHg和OM的相互作用对于水生生态系统的健康至关重要.
人类活动和自然事件改变了河流的OM组成和循环.

研究的目的:

为了研究黄河中MeHg和OM的时空模式.
确定不同季节和水沉积物调节方案对MeHg度和来源的影响.
阐明OM在调节MeHg生产和运输中的作用.

主要方法:

在干旱和潮湿季节收集水和沉积物样本.
对有机物质特征的分析.
量化甲基 (MeHg) 和总 (THg) 度.
在未过的水样中评估MeHg分区 (UMeHg/UTHg比率).

主要成果:

雨季:土原性OM,高UMeHg (206 pg/L),低UMeHg/UTHg (0.37),表明采集区的MeHg输入.
干旱季节:本土的OM,较低的UMeHg (81.8 pg/L),高的UMeHg/UTHg (1.01),表明现场增强的MeHg生产.
水沉积物调节方案 (WSRS):显著增加UMeHg (589 pg/L) 和UMeHg/UTHg (0.78),可能是由于水库输入和沉积物再悬浮.
沉积物MeHg主要来自流域土壤 (湿季) 和现场甲基化 (干季),总体而言,沉积物MeHg的生产重要性较低.

结论:

在OM的季节性变化显著控制黄河的MeHg动态.
WSRS事件是增加河水中MeHg水平的主要驱动因素.
虽然OM影响MeHg来源,但沉积物甲基化似乎对该系统的整体循环有很小的贡献.

关键词:

人类引起的水文事件.甲基是一种.有机物质是有机物质的组成部分.季节性变化季节性变化黄河 - 黄河 - 黄河 - 黄河

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