Li Xiangmei, Li Kexin, Li Shuqin, Li Zehai, Wan Lili, Guo Wei
Sinosteel Maanshan General Institute of Mining Research Co., Ltd., Maanshan, 243071, China.
Huawei National Engineering Research Genter of High Efficient Gyclic Use of Metall Mineral Resources Co., Ltd., Maanshan, 243071, China.
Sci Rep. 2024 Nov 18;14(1):28544. doi: 10.1038/s41598-024-79579-6.
With the accelerated urbanization process in the Yangtze River Delta region, shallow groundwater has received increasing attention. In this work, the exceedances of the ammonium nitrogen (NH-N) and chemical oxygen demand (COD) in shallow groundwater in the central typical area of the Yangtze River Delta were investigated. With the utilization of the national monitoring well (QY10A) as a focal point, a combination of methods, including onsite sampling, hydrogeological surveys, leaching tests, water quality analysis, and isotope tracing, was employed to comprehensively examine groundwater pollution. The study addressed the history of groundwater exploitation, changes in surface water quality, and the influence of stratigraphic structure on groundwater contamination. It has been observed that the NH-N levels in the silty chalky clay layer and the lower grayish black chalky clay layer in the study area are notably elevated, with concentrations reaching up to 87.5 mg/kg and 97.4 mg/kg in some boreholes. The NH-N concentration in the silty clay with silty sand can reach as high as 87.2 mg/kg, whereas the concentration is lower in the underlying layers. In the other strata, NH-N values remain low. The results indicated that the NH-N and COD in the QY10A monitoring well resulted primarily from the inherently high organic nitrogen content in the local geological environment rather than from anthropogenic sources such as industrial parks, domestic sewage, or agricultural activities. This finding highlights the critical role of geological conditions in influencing groundwater quality, emphasizing the necessity of considering these natural factors in pollution prevention and management strategies. Our research provides valuable insights for environmental management in similar geological settings and demonstrates the importance of scientifically rigorous methods for advancing environmental research and policy-making.
随着长江三角洲地区城市化进程的加速，浅层地下水受到了越来越多的关注。在这项工作中，对长江三角洲中部典型地区浅层地下水中铵氮（NH-N）和化学需氧量（COD）的超标情况进行了调查。以国家监测井（QY10A）为重点，采用现场采样、水文地质调查、淋溶试验、水质分析和同位素示踪等多种方法相结合，全面研究地下水污染情况。该研究探讨了地下水开采历史、地表水水质变化以及地层结构对地下水污染的影响。研究发现，研究区域粉质白垩质粘土层和下部灰黑色白垩质粘土层中的NH-N含量显著升高，部分钻孔中的浓度分别高达87.5mg/kg和97.4mg/kg。含粉砂粉质粘土层中的NH-N浓度可达87.2mg/kg，而其下伏地层中的浓度较低。在其他地层中，NH-N值较低。结果表明，QY10A监测井中的NH-N和COD主要源于当地地质环境中固有的高有机氮含量，而非工业园区、生活污水或农业活动等人为来源。这一发现凸显了地质条件对地下水质量的关键影响，强调了在污染预防和管理策略中考虑这些自然因素的必要性。我们的研究为类似地质环境下的环境管理提供了有价值的见解，并证明了科学严谨的方法对于推进环境研究和政策制定的重要性。
