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Hydrogeochemical and spatial assessment of groundwater quality from basement aquifers in the Central Plateau Region of Burkina Faso, West Africa

机译：西非博士法院中央高原地区地下室含水层地下水质量的水文化学和空间评价

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摘要

People in the semi-arid region of central Burkina Faso rely heavily on groundwater resources from basement rock aquifers for potable uses. In this study, the hydrogeochemical processes that control groundwater quality and contribute to better water resource management were characterised using major ion geochemistry, the calculation of water quality indices, and through the use of spatial geostatistical analysis. A total of 360 groundwater samples were collected in hand-pumped borewells. The overall low total dissolved solids of the groundwater indicates a fast recharge regime during the rainy season. Generally, the groundwater was circumneutral to alkaline in nature with dominant Ca2++Mg2+ and HCO3− concentrations. Based on the calculated water quality indices, most of the borewells sampled produced groundwater that was suitable for human consumption. However, a few borewells exhibited high As and F− concentrations that exceeded drinking water permissible limits. The high As concentrations were likely derived from weathering of volcano-sedimentary rocks, whereas, those of F− appeared to be from granitic rocks. Bivariate plots showed that geochemical processes such as silicate weathering, mineral dissolution and precipitation, ion exchange together with evapotranspiration were the primary factors influencing the groundwater solute acquisition. In addition, desorption and ion exchange under alkaline pH conditions could enhance As and F− enrichment in the groundwater. Spatial distribution maps of ionic strength and electrical conductivity identified the northern sector of the study area as the groundwater recharge areas, which should require protection and a periodic groundwater monitoring plan. The findings of this study may help decision-makers in setting up suitable groundwater quality management strategies and selecting locations for future borewell development in this semi-arid environment and fractured crystalline aquifers.
机译：中央布尔基纳法索半干旱地区的人们依赖地下室岩石含水层的地下水资源进行饮用用途。在这项研究中，使用主要离子地球化学，水质指数计算以及使用空间地质统计分析，对地下水质量控制地下水质量和更好的水资源管理有助于更好的水资源管理。在手动泵送的轴上收集了总共360个地下水样品。地下水的整体低总溶解固体表明了雨季期间快速的充电制度。通常，地下水与显性Ca2 ++ Mg2 +和HCO 3-浓度存在于自然界中的碱性。基于计算出的水质指数，大多数训练均采用适合人类消费的地下水。然而，几个训练展都表现出高于和F-浓度超过饮用水允许的限制。浓度的高度可能来自火山沉积岩的风化，而F-似乎是来自花岗岩岩石。双抗体局表明，硅酸盐风化，矿物溶解和沉淀，离子交换等地球化学方法是影响地下水溶质采集的主要因素。此外，碱性pH条件下的解吸和离子交换可以增强地下水中的富集。离子强度和电导率的空间分布图确定了研究区域的北部部门作为地下水补给地区，应要求保护和周期性地下水监测计划。本研究的调查结果可能有助于决策者在这种半干旱环境和裂缝结晶含水层中建立适当的地下水质量管理策略和选择未来训练的位置。

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  • 来源
    《Environmental earth sciences》 |2021年第9期|358.1-358.20|共20页
  • 作者

    Aboubakar Sako; Sayoba Kafando;

  • 作者单位

    UFR Sciences Appliquées et Technologie Université de Dédougou BP 139 Dédougou Burkina Faso|Laboratoire Géosciences et Environnement (LaGE) Département des Sciences de la Terre Université Joseph Ki-Zerbo Ouagadougou Burkina Faso;

    Bureau des Mines et de la Géologie du Burkina Faso Ouagadougou Burkina Faso;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Water quality index; Basement aquifer; Hydrogeochemistry; Semi-arid region;

    机译：水质指数;地下室含水层;水文地球化学;半干旱地区;

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