在平原湖 (中国西北部) 周围的浅地下水中,源和转化过程:通过多种同位素和水化学证明
Bo Feng1, Yanxia Zhong2, Jing He3
1School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia, 750021, China.
Chemosphere
|June 25, 2023
概括
湖泊附近地下水中的酸盐污染是一个全球性问题. 这项研究确定了N肥料,土壤有机物,肥料和污水作为关键的源,化是沙湖周围地下水的主要过程.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 地质化学 地质化学
背景情况:
- 在全球范围内,地下水质量受到酸盐 (NO3-N) 污染的重大影响.
- 了解 (N) 的来源和地下水的命运对于有效的湖泊管理至关重要.
- 中国西北的沙湖面临着地下水污染带来的挑战.
研究的目的:
- 确定沙湖周围浅层地下水中的来源和转化途径.
- 评估研究区域中酸盐污染的程度.
- 为了研究地下水和湖泊之间的相互作用.
主要方法:
- 稳定同位素分析 (δ2H-H2O, δ18O-H2O, δ15N-NO3, δ18O-NO3) 的情况.
- 水化学分析. 水化学分析.
- 水力动力监测. 水力动力监测.
- 贝叶斯同位素混合模型 (MixSIAR).
主要成果:
- 57%的地下水样本超过了世卫组织对酸盐 (10 mg/L) 的饮用水值.
- 亚酸盐同位素表示多个来源,包括N肥料 (40.61%),土壤有机N和肥 (35.86%),以及污水 (21.55%).
- 距湖1.22公里的地下水显示出强烈的相互作用,其中化占主导地位.
结论:
- 该研究提供了一种全面的同位素和水化学方法,以精确确定源和受污染的地下水中的变化.
- 农业活动 (肥料,) 和污水是导致酸盐污染的重要因素.
- 沙湖的有效管理策略需要解决这些分散和点污染源.
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