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英国地表水中的水生有机物组成的空间和时间变化

Catherine S Moody¹, Nicholle G A Bell², C Logan Mackay²

¹water@leeds, School of Geography, University of Leeds, Leeds LS2 9JT, U.K.

ACS ES&T water

|May 15, 2025

概括

英国饮用水中的溶解有机物 (DOM) 在地理和季节性上有所不同. 了解水中溶解有机物中的这些变化是改善水处理过程的关键.

科学领域:

环境化学环境化学
水质科学水质科学
有机地化学有机地化学

背景情况:

英国的饮用水处理面临着越来越多的挑战,原因是水中溶解有机物 (DOM) 的演变.
DOM组成的空间和时间变化显著影响了水的可处理性,但仍然不太了解.
气候变化和降雨模式的变化通过影响DOM特征而加剧了这些挑战.

研究的目的:

调查英国地表水域DOM组成的空间 (南北梯度) 和时间 (四年期,季节性) 变化.
为了确定DOM源和特征如何在英国各地的水源和水库之间有所不同.
为了将观察到的DOM组成变化与原始饮用水质量和处理影响相关联.

主要方法:

利用先进的分析技术 (例如,超高性能液态色谱与高分辨率质谱) 来描述DOM组成.
在英国的南北截面收集了四年来收集的水样,包括山头溪流和水库.
分析了DOM的关键组成指标,包括芳香度,氧化状态和特定化合物类 (碳水化合物,,脂质).

主要成果:

在DOM组成中观察到显著的南北趋势:北方站点的碳水化合物和类化合物较低,而南方站点的脂类化合物较低.
在2021年秋季 (降雨量较低后的夏季) 收集的DOM与2018-2020年样本相比,呈现出更高的芳香度,更低的氧化和更大的多样性.
季节性变化,特别是在秋天,显示脂质含量降低和氧芳香化合物增加,这与降雨复湿和土壤有机物动员有关.

结论:

英国水域的DOM成分表现出明显的地理和季节性变化,受到水域特征和气候条件的影响.
秋季DOM轮的特点是增加了芳香度和多样性,这给饮用水处理带来了更大的挑战.
了解这些DOM动态对于在面对气候变化和不断变化的水质时制定弹性水处理策略至关重要.

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