追踪农药动态:高分辨率为地地下水质量提供了新的见解
Johannes Schorr1, Franziska Jud2, Daniele la Cecilia3
1Eawag: Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, Universitätstrasse 16, ETH Zürich, 8092 Zürich, Switzerland.
Water research
|September 22, 2024
概括
高频监测岩石喷泉显示,在降雨事件发生后,农药和污染物超过饮用水限制. 持续采样至关重要,因为复合样本错过了关键的峰值污染水平.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 分析化学 分析化学
背景情况:
- 由于地下水的快速流动,岩水层容易受到污染.
- 农药运输和转化产品对水质构成风险.
- 缺乏高分辨率的现场监测阻碍了对污染物动态的理解.
研究的目的:
- 实施持续的,高时间分辨率的现场监测农药及其转化产品在石泉.
- 评估降雨事件对污染物度和水质参数的影响.
- 为了比较频率采样与复合采样在检测污染物峰值水平的有效性.
主要方法:
- 每20分钟部署一个便携式HPLC-HRMS/MS系统进行现场农药分析.
- 同时监测水质参数 (电导率,pH,酸盐,度,水位) 和细菌细胞数量.
- 分析了两年来在两个研究地点在六次和三次降雨事件中收集的水样.
主要成果:
- 农药和转化产品,特别是甲米特龙,在雨后的峰值度超过1000 ng/L时被检测到.
- 在一次事件中,饮用水限制被超过了多达38小时.
- 高频采样 (20分钟间隔) 准确地捕获了峰值度,与42小时复合样本不同,这些样本明显低估了峰值度.
- 农药度峰值与酸盐水平升高,细菌数量,电导率和pH强烈相关.
结论:
- 持续的高频监测对于准确评估岩系统中的农药污染是必不可少的.
- 复合采样方法不足以检测短暂的污染事件和可能超出监管限制的情况.
- 降雨事件引发了岩水层中的快速污染物运输,影响水质,并对饮用水供应构成风险.
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