Application of ferrous iron containing minerals to remove Hexavalent chromium from soil
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2015, Vol 7, Issue 2
Abstract
In this research, the removal of hexavalent chromium from three Cr (VI)-spiked soils by different Fe (II) containing minerals (phlogopite, biotite, magnetite and pyrite) was investigated. The soils received Cr (VI) in two levels (100 and 500 mg Cr (VI) kg-1 soil) and then were subjected to several wetting and drying cycles for one month. A batch experiment was carried out in the mineral amended soils (5 and 10 g kg-1) for 1 and 4 weeks. Significant differences (p<0.01) were observed between the Cr (VI) removal efficiency of the amendments. On average, pyrite removed Cr (VI) from the soils 18%, 29% and 37% more efficient than magnetite, biotite and phologopite, respectively. Increasing the amendment dosage and contact time had more or less little effect on the Cr (VI) removal efficiency. The mean Cr (VI) removal efficiencies were 5.43±0.87, 14.65±1.93 and 40.87±5.46% for soils 1, 2 and 3, respectively. According to the results obtained soil characteristics, particularly pH and organic carbon, play dominant role both in self and amendment-induced removal efficiencies of Cr (VI).
Authors and Affiliations
Mahdieh Khorshida, Shahin Oustana, Norsatollah Najafia, Alireza Khataeeb
Keywords
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