1. Department of Soil Science, Khuzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran
2. Department of Soil Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3. Department of Geology, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
4. Inorganic Geochemistry Facility, Centre for Environmental Geochemistry, British Geological Survey, Nottingham, UK