Document Type : Research Paper
Authors
1 Assistant Professor, Faculty of Agriculture, University of Kurdistan, Iran
2 Associate Professor, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, University of Tehran, Iran
Abstract
Arsenic has been recognized as a toxin element for human. Minerals frequency can affect on arsenic content and Sufficient mineralogical characterization of contaminated sites should assist geochemical models that assess the potential of natural attenuation remediation of a subsurface contaminated with arsenic. In order to mineralogy investigation in the arsenic soil in Bijar area, 83 profiles were selected based on the prepared geopedology map and 229 soil and 15 parent material samples were collected. Routine physical and chemical characteristics and soil arsenic contents were measured in all samples. Relative quantity and types of clay and powder minerals were determined for 35 soil and 15 parent material samples by XRD analysis. Smectite, illite, kaolinite, chlorite and vermiculite were the most important clay minerals in the region. enargite, arsenoilte, sphalerite, nicoolite, conichalcite, arsenosulvanite and cobaltite based on the powdery mineralogy results were the most important arsenic bearing minerals in the region. The type and content of minerals were different and their content were higher in the profiles with very high arsenic. In the mudston and Fe-rich rock arsenic concentration are higher compared to the other parent materials. Also the minerals content were higher in the mudston and Fe-rich rock compared to the other parent materials.
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