采用水地化学,δ15NNO3同位素,土地利用和统计工具评估哥斯达黎加火山含水层中酸盐污染源和生物化学过程的多学科方法
Helga Madrigal-Solís1, Iñaki Vadillo-Pérez2, Pablo Jiménez-Gavilán2
1Programa de Hidrología Ambiental, Escuela de Ciencias Biológicas, Universidad Nacional, 40101, Heredia, Costa Rica.
The Science of the total environment
|July 27, 2024
概括
哥斯达黎加主要水源的酸盐污染在城市和农业地区都很高. 使用土地利用和水化学的综合方法揭示了污染源和范围,为水质评估提供了切实可行的替代方案.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 评估水质水质的评估.
背景情况:
- 巴尔瓦和科利马多层水库系统对于哥斯达黎加大都市区的饮用水至关重要.
- 酸盐污染对这个重要的水资源构成重大威胁.
研究的目的:
- 评估巴尔瓦和科利马含水层中酸盐污染的动态.
- 为了确定占主导地位的生物地化学过程,并完善酸盐来源的解释.
- 评估土地利用和人类活动对地下水质量的影响.
主要方法:
- 综合方法结合多变量统计,水化学参数,污水排放和土地使用数据.
- 在7年时间 (2015-2022) 中分析了714个地下水样本.
- 包括酸盐,主要离子,溶解有机碳和稳定同位素 (δ15N-NO3) 的分析.
主要成果:
- 在城市和农业地区发现酸盐度高于最大度水平.
- 氧化条件有利于巴尔瓦和科利马含水层的矿化和化.
- 土地利用 (森林/草地,农业/城市,城市) 显著影响地下水质量,甚至影响更深层水层.
结论:
- 使用水文地球化学和土地利用模式的综合方法是有效的评估酸盐污染和来源.
- 溶解的有机碳和其他水化学参数提高了污染源识别的准确性.
- 这种综合方法为传统的同位素混合模型提供了一种实用且具有成本效益的替代方案.
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