Water-soluble inorganic pollutants may constitute an environmental toxicity problem if their movement through soils and potential transfer to plants or groundwater is not arrested. Biochar has recently been used to sequester carbon and remediate soil with both heavy metal and organic pollutants. The characteristics of biochar are influenced mainly by the preparation temperature and biomass sources. Biochars were produced from three different sources (viz., cow dung, poultry manure, and sewage sludge) at two different temperatures (low temperature - +250ºC and high temperature - +450º C). Different physical (e.g. surface area, SEM, EDX), chemical (CEC, organic carbon, N, P, K, S, As) and physicochemical (pH) properties of the prepared biochars were measured. Two sets of experiment (Arsenic treated and non-treated soils) were done. The capability of biochars produced at different temperature to abate arsenic (As) accumulation in plants (Ipomoea aquatica) was carried out in pot culture experiment. Biochars were applied at 5 t/ha to soil spiked with 1 mg/L of As solution (80% arsenite + 20% arsenate). Plants were grown for 45 days after germination. Incubation study was also done to see the sorption of water soluble arsenic (As) by biochars with time. To alleviate arsenic accumulation in plant the efficacy of biochar was in order of Sbch>Pbcl>Cbcl for arsenic non-treated soil and in arsenic treated soil the order was in Sbch>Pbch>Cbcl.
