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Hydrogeochemical and multi-tracer investigations of arsenic-affected aquifers in semi-arid West Africa 被引量:3
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作者 Anja Bretzler Lucien Stolze +5 位作者 Julien Nikiema Franck Lalanne Elaheh Ghadiri Matthias S. Brennwald massimo rolle Mario Schirmer 《Geoscience Frontiers》 SCIE CAS CSCD 2019年第5期1685-1699,共15页
The semi-arid Sahel regions ofWest Africa rely heavily on groundwater from shallow to moderately deep (<100 m b.g.l.) crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected b... The semi-arid Sahel regions ofWest Africa rely heavily on groundwater from shallow to moderately deep (<100 m b.g.l.) crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic (As) concentrations (>10 μg/L) stemming from the oxidation of sulphide minerals (pyrite,arsenopyrite) in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers (noble gases,3H,stable water isotopes (2H,18O)) and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties (e.g.redox conditions,As concentrations,water level,residence time) over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short (<50 a) and long (>10^3 a) residence times as indicated by 3He/4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times >10^3 years already at depths of <50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future. 展开更多
关键词 Arsenic Groundwater chemistry WEST AFRICA Fractured aquifers RESIDENCE time NOBLE gases
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污染区域的地下水模拟分析
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作者 Stefanie Jaeger Markus Rhni +1 位作者 Christina Eberhardt massimo rolle 《实验与分析》 2008年第2期42-43,共2页
受污染区域有害物质的时序分析在环境分析中非常重要。但安置连续采样系统也很困难。本文建立一个模拟槽,模拟土壤-地下水系统,将有害物质加入模拟槽中,用CCD摄像机跟踪颜色示踪剂。实验结果表明.CCD数据与荧光测量和数学模型估计... 受污染区域有害物质的时序分析在环境分析中非常重要。但安置连续采样系统也很困难。本文建立一个模拟槽,模拟土壤-地下水系统,将有害物质加入模拟槽中,用CCD摄像机跟踪颜色示踪剂。实验结果表明.CCD数据与荧光测量和数学模型估计结果相当吻合。 展开更多
关键词 地下水系统 模拟分析 污染区域 CCD数据 有害物质 摄像机跟踪 环境分析 时序分析
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