中国西南典型喀斯特湿地水体和沉积物中的有机氯农药

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Geochemical Exploration Pub Date : 2024-06-02 DOI:10.1016/j.gexplo.2024.107519
Qianqian Hu , Yanpeng Liang , Honghu Zeng , Huanfang Huang , Wenwen Chen , Litang Qin , Xiaohong Song , Xiaoyu Yan
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引用次数: 0

摘要

会县喀斯特湿地位于中国西南部,是中国最大的喀斯特湿地。历史上,有机氯农药(OCPs)对水环境和周边居民的健康造成了负面影响。本研究调查了会仙湿地多种环境介质中 OCPs 的污染状况和环境归宿。15种OCPs在湖水、沟渠水、地下水和湖泊沉积物中的总浓度范围分别为46.8-306 ng-L-1、77.8-251 ng-L-1、26.0-233 ng-L-1和44.8-345 ng-g-1。不同 OCP 的浓度和比例具有明显的季节性。从滴滴涕和六氯环己烷的典型比例可以看出,历史残留物是该地区 OCPs 的主要来源。岩溶地区极易受到环境变化的影响,岩溶湿地系统的高度动态性以及多模式 OCPs 在不同介质中的快速迁移都证明了这一点,而不会造成严重破坏。根据风险评估,会仙湿地沉积物的可能致癌风险和水体的生态风险都是可以接受的。相比之下,饮用湖水可能会对当地居民的健康造成危害,这一点令人担忧。
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Organochlorine pesticides in water and sediment at a typical karst wetland in Southwest China

The Huixian karst wetland, situated in southwest China, is the largest karst wetland. Historically, organochlorine pesticides (OCPs) have negatively affected the aquatic environment and the health of surrounding residents. In this study, the pollution status and environmental fate of OCPs in multiple environmental media in the Huixian wetland were investigated. The 15 OCPs' total concentration ranges in lake water, ditch water, groundwater, and lake sediment were 46.8–306 ng·L−1, 77.8–251 ng·L−1, 26.0–233 ng·L−1, and 44.8–345 ng·g−1, respectively. The concentrations and proportions of the different OCPs demonstrated significant seasonality. Historical residues are the main source of OCPs in the region, as evidenced by the typical ratios of DDTs and HCHs. Karst regions are extremely vulnerable to environmental changes, as evidenced by the highly dynamic character of the karst wetland system and the rapid migration of multimodal OCPs in different media without considerable damage. According to the risk assessment, both the possible carcinogenic risk to sediments in the Huixian wetland and the ecological risk to water bodies were acceptable. In contrast, the consumption of lake water may put the local population at health risk, which is a cause of concern.

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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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