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Hydrogeochem.cal and m.lti-tracer investigations of arsenic-affected aquifers in sem.-arid West Africa

Geoscience Frontiers 2019年第5期10卷 1685-1699页

作者： Anja Bretzler Lucien Stolze julien Nikiem. Franck Lalanne Elaheh Ghadiri m.tthias S. Brennwald m.ssim. rolle.m.rio Schirm.r Eawag Swiss Federal Institute of Aquatic Science and TechnologyDübendorfSwitzerland Centre d’Hydrogéologie et de Géotherm.e (CHYN) Université de NeuchatelSwitzerland Technical University of Denm.rk (DTU) LyngbyDenmark Université Ouaga I Pr. joseph KI-ZERBO OuagadougouBurkina Faso Institut International d’Ingénierie de l’Eau et de l’Environnem.nt (2iE) OuagadougouBurkina Faso ETH Zürich Department of Environmental System SciencesZürichSwitzerland

The sem.-arid Sahel regions ofWest Africa rely heavily on groundwater from.shallow to m.derately deep (10 μg/L) stem.ing from.the oxidation of sulphide m.nerals (pyrite,arsenopyrite) in m.neralised *** aquifers are s... 详细信息

The sem.-arid Sahel regions ofWest Africa rely heavily on groundwater from.shallow to m.derately deep (m.b.g.l.) crystalline bedrock aquifers for drinking water *** quality m.y be affected by high geogenic arsenic (As) concentrations (>10 μg/L) stem.ing from.the oxidation of sulphide m.nerals (pyrite,arsenopyrite) in m.neralised *** aquifers are still little investigated,especially concerning groundwater residence tim.s and the influence of the annual m.nsoon season on groundwater *** gain insights on the tem.oral aspects of As contam.nation,we have used isotope tracers (noble gases,3H,stable water isotopes (2H,18O)) and perform.d hydrochem.cal analyses on groundwater abstracted from.tube wells and dug wells in a sm.ll study area in southwestern Burkina *** revealed a great variability in groundwater properties (*** conditions,As concentrations,water level,residence tim.) over spatial scales of only a few hundred m.tres,characteristic of the highly heterogeneous fractured *** As levels are found in oxic groundwater of circum.neutral pH and show little relation with any of the m.asured *** concentrations are relatively stable over the course of the year,with little effect seen by the *** residence tim. does not seem.to have an influence on As concentrations,as elevated As can be found both in groundwater with short (10^3 a) residence tim.s as indicated by 3He/4He ratios spanning three orders of *** results support the hypothesis that the proxim.ty to m.neralised zones is the m.st crucial factor controlling As concentrations in the observed redox/pH *** existence of very old water portions with residence tim.s >10^3 years already at depths of m.*** a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers m.y be an issue in the

关键词： Arsenic Groundwater chem.stry West Africa Fractured aquifers Residence tim. Noble gases

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