Modified Oyster Shell Powder with iron (II) sulfate heptahydrate to improve arsenic uptake in solution and in contaminated soils

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Abstract Arsenic is a metalloid whose presence can be due to natural or anthropological causes. It is considered as a toxic chemical that puts human health at high risk. In this study, we evaluated a novel modified oyster shell (MOS) that was coated with iron (II) sulfate heptahydrate using two different proportions through batch sorption experiments in an arsenic solution and in arsenic-contaminated soils. The soils contaminated with Arsenic were extracted from a contaminated site in Cheonan, South Korea and the average arsenic concentration of the soil collected was 136.28 mg/kg. Different doses of oyster shell, and modified oyster was used to understand the effect of the addition of iron (II) sulfate heptahydrate via a sorption test with 50 g of contaminated soil, pot cultivation test with 150 g and column percolation test with 150 g. The authors observed a comparable improvement of Arsenic stabilization from 10–60% with the addition of iron (II) sulfate heptahydrate to oyster shell.

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