NDLI: Total and bioaccessible arsenic and lead in soils impacted by mining exploitation of Fe-oxide-rich ore deposit at Cerro de Mercado, Durango, Mexico

Content Provider	Springer Nature Link
Author	Morales, Nidia A. Martínez, David García Meza, J. Viridiana Labastida, Israel Armienta, Ma. Aurora Razo, Israel Lara, René H.
Copyright Year	2014
Abstract	Total and bioaccessible concentrations of arsenic (As) and lead (Pb), as well as their bearing phases in the adjacent soil area (residential area) of the historic and active Fe-oxide-rich mining district of Cerro de Mercado, Durango (Mexico), were evaluated. Results indicated the presence of arsenopyrite, galena, and As-bearing phases in ultrafine (<10 μm), fine (10–20 μm) and large (20–80 μm) particle sizes. Total concentrations ranged from 55 to 221 mg kg$^{−1}$ As, near active and old tailings impoundments, exceeding 2.5–10 times the US EPA and ATSDR trigger level for residential soil remediation (20 mg kg$^{−1}$). The corresponding bioaccessible fractions ranged from 0.7 to 18 %. Analyses by ATR-FTIR showed the presence of As sorbed onto iron-oxide-rich materials. Total Pb concentrations ranged from 22.3 to 107 mg kg$^{−1}$, below the US EPA trigger level (400 mg kg$^{−1}$). The corresponding bioaccessible fractions ranged from 2.1 to 16 %. Total and bioaccessible results indicated that further studies of As are required whereas Pb bioaccessibility values were under the reference concentrations established by Mexican guidelines for implementing a remediation strategy, suggesting that environmental impact occurs mainly for As. Arsenic and Pb dispersion from their pollution sources (historic and active tailing impoundments, waste rock dumps), was mainly associated with airborne particles transport in SW–NE direction impacting the adjacent soil area at the Cerro de Mercado mining district. Finally, an environmental impact assessment should be done in the studied area.
Starting Page	3249
Ending Page	3261
Page Count	13
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	7
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic Lead Soil pollution Mining Iron-rich mineralization Durango City Bioaccessible fraction Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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