Light transmission method to explore the migration and distribution of Cr(VI) in a sandy aquifer
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The migration and distribution of contaminants in heterogeneous aquifers are mostly investigated through numerical simulations. They are rarely examined through experimental simulations because of sampling difficulties. In this study, we used the light transmission method (LTM) to explore the migration and distribution of hexavalent chromium [Cr(VI)] in homogeneous sandy aquifers with or without a low-permeability bottom and lens (heterogeneous aquifer). Experimental phenomena were observed via images obtained with a high-power light source. The migration distances of pollution plume were also monitored. Under heterogeneous conditions, low-permeability aquifer materials considerably inhibited the migration of Cr(VI) and altered the Cr(VI) migration rate of horizontal and vertical plumes spread to a certain extent. Common horizontal and vertical migration curve equations in all three conditions were also obtained through distance–time curve fitting. The difference between high- and low-concentration zones was accurately revealed, and the experimental phenomenon was further explained. The proposed method could be used for the qualitative investigation and visualization of the migration and distribution of Cr(VI).
KeywordsHeterogeneous sandy aquifer LTM Migration and distribution Stratification Lens Cr(VI)
This work was supported by the National Nature Science Foundation of China (Grant No. 41302184), Scientific Frontier and Interdisciplinary Research Project of Jilin University, Outstanding Youth Cultivation Plan of Jilin University, and Key Laboratory of Groundwater Resources and Environment of Ministry of Education (Jilin University).
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