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河流在中国东部沿海平原河流网络的来源和转化:来自多个稳定同位素的新见解

Wenli Chen¹, Xiaohan Zhang², Nianting Wu²

¹Key Laboratory of Watershed Science and Health of Zhejiang Province, School of Public Health and Management, Wenzhou Medical University, Wenzhou 325035, China.

The Science of the total environment

|March 13, 2024

概括

这项研究表明,市政污水是沿海河流中污染的主要来源,超过了土壤和肥料的贡献. 先进的同位素分析有助于确定污染源,以便更好地管理环境.

科学领域:

环境化学环境化学
同位素水文学同位素水文学
水质管理水质管理

背景情况:

河流污染是一个重要的全球环境问题,影响水质和生态系统.
传统的酸盐 (NO3-) 同位素分析 (δ15N/δ18O-NO3-) 在具有不同形式的复杂河流网络中是有限的.
沿海平原河流经常面临来自多个来源的高总 (TN) 负载,需要进行更全面的评估.

研究的目的:

研究典型的中国沿海平原河流网络 (温瑞唐河) 中的转化过程和来源.
开发和应用R (SIAR) 模型中的多同位素和稳定同位素分析来量化TN源贡献.
为在类似的水生环境中提供有效的污染控制和整治策略的见解.

主要方法:

使用了多种稳定同位素: δ15N/δ18O-NO3-, δ18O-H2O, δ15N-NH4+, δ15N-PN,以及 δ15N批量/δ18O/SP-N2O.
采用水化分析来了解循环过程.
应用了稳定同位素分析在R (SIAR) 模型的定量TN源分配.

主要成果:

观察到严重的污染,TN度平均为3.77 ± 1.39 mg/L.
,酸盐和悬浮颗粒是主要的成分.
化被确定为主要的N循环过程,生物同化和脱化作为次要过程.

结论:

市政污水被确定为主要的源,在潮湿 (40.6%) 和干燥 (59.1%) 季节都有显著的贡献.
土壤是第二大贡献者,其次是肥和大气沉积.
这项研究增强了对性沿海河流中动态的理解,为污染管理提供了信息.

关键词:

沿海平原河流沿海平原河流多个稳定的同位素.生物地质化学生物地质化学污染污染污染这就是SIAR模型.

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