Determination of arsenic in sediment samples from a well in the Comarca Lagunera, Mexico

In order to elucidate the processes that incorporate arsenic to the groundwater of the Comarca Lagunera, México. Scanning Electron Microscopy (SEM) studies of the sediment of a well were earned out. as well as dissolved oxygen profiles, redox potential and arsenic hi the water column inside the well. The results of the analyses indicate that the sediment contains Arsenopyrite (FeAsS). Sulfides of (Pb-Cu-As) and Oxides of (Pb-Fe-As). The results also demonstrated the reductive dissolution of non oxides containing arsenic. The results obtained through the field and laboratory parameters of the groundwater, and the mineralogical characterization of the sediments at the different depths of the well, allowed to establish two possible mechanisms that would contribute to the incorporation of arsenic into groundwater that are: hi anoxic conditions the reductive dissolution of iron oxide that would be arsenic earner phases, and in oxic conditions the incorporation of arsenic from the primary phases of polymetallic sulphides containing arsenic (arsenopyrite). © 2018, Centro de Ciencias de la Atmosfera, UNAM. All rights reserved.

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