Li Jing, Li Fadong, Liu Qiang
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
Chemosphere. 2017 Jul;178:143-153. doi: 10.1016/j.chemosphere.2017.03.052. Epub 2017 Mar 31.
Large-scale irrigation projects have impacted the regional surface-groundwater interactions in the North China Plain (NCP). Given this concern, the aim of this study is to evaluate levels of PAH pollution, identify the sources of the PAHs, analyze the influence of surface-groundwater interactions on PAH distribution, and propose urgent management strategies for PAHs in China's agricultural areas. PAH concentrations, hydrochemical indicators and stable isotopic compositions (δO and δH) were determined for surface water (SW) and groundwater (GW) samples. PAHs concentrations in surface water and groundwater varied from 11.84 to 393.12 ng/L and 8.51-402.84 ng/L, respectively, indicating mild pollution. The seasonal variations showed the following trend: PAHs in surface water at the low-water phase > PAHs in groundwater at the low-water phase > PAHs in surface water at the high-water phase > PAHs in groundwater at the high-water phase. Hydrochemical and δO value of most groundwater samples distributed between the Yellow River and seawater. The mean value of mixture ratio of the Yellow River water recharge to the groundwater was 65%, few anomalous sites can reach to 90%. Surface-groundwater interactions influence the spatial distribution of PAHs in the study area. In light of the ongoing serious pollution, management practices for source control, improved control technologies, and the construction of a monitoring network to warn of increased risk are urgently needed.
大型灌溉工程对华北平原的区域地表水 - 地下水相互作用产生了影响。鉴于此，本研究旨在评估多环芳烃（PAH）污染水平，确定PAHs的来源，分析地表水 - 地下水相互作用对PAH分布的影响，并为中国农业地区的PAHs提出紧急管理策略。测定了地表水（SW）和地下水（GW）样品中的PAH浓度、水化学指标和稳定同位素组成（δO和δH）。地表水和地下水中的PAHs浓度分别在11.84至393.12 ng/L和8.51 - 402.84 ng/L之间，表明污染程度较轻。季节变化呈现以下趋势：低水位期地表水中的PAHs > 低水位期地下水中的PAHs > 高水位期地表水中的PAHs > 高水位期地下水中的PAHs。大多数地下水样品的水化学和δO值分布在黄河水和海水之间。黄河水补给地下水的混合比例平均值为65%，少数异常点可达到90%。地表水 - 地下水相互作用影响了研究区域内PAHs的空间分布。鉴于当前严重的污染状况，迫切需要采取源头控制管理措施、改进控制技术以及建设监测网络以预警风险增加。
