1. Department of Environmental Geochemistry, Fluminense Federal University, Rio de Janeiro, Brazil
2. College of Southern Nevada, Dept. of Physical Sciences, North Las Vegas, NV, USA
3. Embrapa Agrobiology, Dept. of Soil Fauna, Embrapa Agrobiology, Rio de Janeiro, Brazil
4. Geological Survey of Brazil/Company of Research of Mineral Resources (SGB/CPRM), Belo Horizonte Regional Office, Belo Horizonte, Minas Gerais, Brazil