尼日利亚西南部一处废料场附近的地下水污染流动路径和重金属移动特征描述

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
AbdulGaniyu Isah , Etido Nsukhoridem Bassey , Olukole Adedeji Akinbiyi , Rasaq Adebayo Azeez , Andrew Sunday Oji , Tijjani El-Badawy
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引用次数: 0

摘要

本研究调查了尼日利亚西南部一个废物处理场附近潜在的地下水污染。该地区地质环境复杂,岩层断裂,给传统的监测方法带来了巨大挑战。为了应对这些挑战并全面评估地下水状况,我们采用了电阻率断层扫描 (ERT)、地面穿透雷达 (GPR) 以及重金属和水电导率地球化学分析相结合的方法。通过这种方法,可以调查地下水位,确定潜在的污染区域,并划定污染物的流动路径。GPR 发现了一个被称为 "阴影区 "的浅层区域,其导电残留物表明存在污染物,导电率在 1 至 1.5 米之间异常。ERT 证实,在废弃的主垃圾场周围,0-2 米深处有一个浅电阻层,这是由于压实的废物和表土造成的。在该层之下,观察到一个低电阻率区,通过多孔风化带向下递减。这与水井数据中的高水传导性相对应,介于 21 至 147 mS/m 之间(相当于 6.80 至 47.62 Ω-m),表明在 2 至 10 米深的砂砾风化层中存在高传导性异常,疑似沥滤液羽流。根据地面实况数据进行的验证确认了雷达特征、地质电学成像和地下岩性之间的相关性。对水井和土壤样本的分析表明,镉、汞、铅、砷和钴的浓度偏高,从 641 ppb 到 1175 ppb 不等,超过了规定的饮用水安全限值,令人担忧。此外,土壤样本中的镍和铬含量也很高,一般在 0 到 1 ppb 之间。这些发现突出表明,由于沥滤液区靠近风化基底复合区的地下水位,地下水污染的风险很大。这项研究表明,地球物理和地球化学方法的有效整合可用于全面绘制污染区地图和确定污染物迁移的优先路径。研究结果强调了在类似的复杂地质环境中实施综合风险评估方法的迫切需要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterizing groundwater contamination flow-paths and heavy metal mobilization near a waste site in Southwestern Nigeria
This study investigates potential groundwater contamination near a waste disposal site in southwestern Nigeria. The area's complex geological setting, characterized by fractured rock formations, posed significant challenges for traditional monitoring methods. To address these challenges and comprehensively assess groundwater conditions, we employed a combined approach utilizing Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), and geochemical analysis of heavy metals and water conductivity. This approach enabled the investigation of groundwater levels, identification of potential contamination zones, and delineation of contaminant flow paths. GPR identified a shallow zone, termed the “shadow zone,” with conductive residues indicating contaminants with anomalous conductivity ranging from 1 to 1.5 m. An intermittent reflection zone at a depth of 1.5–3.5 m suggested the potential presence of leachate-impacted groundwater. ERT confirmed a shallow resistive layer at depths of 0–2 m, attributed to compacted waste and topsoil, around the abandoned main dumpsite. Below this layer, a zone of low resistivity, decreasing downward through a porous weathered zone, was observed. This corresponded to high water conductivity in well data, ranging from 21 to 147 mS/m (equivalent to 6.80 to 47.62 Ω-m), indicating a high conductive anomaly suspected to be a leachate plume at depths of 2–10 m in a sandy-gravelly weathered zone. Validation against ground truth data confirmed the correlation between radar signatures, geoelectrical imaging, and subsurface lithology. Analysis of well and soil samples revealed concerningly elevated concentrations of cadmium, mercury, lead, arsenic, and cobalt, ranging from 641 to 1175 ppb, exceeding established safety limits for drinking water. Additionally, soil samples showed elevated levels of nickel and chromium, generally ranging from <0 to <1 ppb. These findings highlight the significant risk of groundwater contamination due to the proximity of the leachate zone to the groundwater table in the weathered basement complex. This study demonstrates the effective integration of geophysical and geochemical methods for comprehensive mapping of contaminated zones and identification of preferential pathways for contaminant migration. The findings underscore the critical need for implementing comprehensive risk assessment methodologies in similar complex geological settings.
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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