Worldwide arsenic (As) contamination in soils induces pollution of surface and ground waters, reduces crop quality and yield, and threatens human health. Biochar-based material has been proposed as ameliorants for contaminated soils. Here soil incubations were conducted to investigate the effects of biochar, red mud and red mud-modified biochar on the pH, total organic carbon content, sodium bicarbonate (NaHCO₃)-extractable As concentration and microbial community composition of As-contaminated soils. Results show red mud-modified biochar reduces the concentration of NaHCO₃-extractable As by 27%, whereas this concentration increases by 23% using biochar alone and 6% using red mud alone. Similar trends are observed for HCl-extractable As. The red mud and red mud-modified biochar treatments increased the relative abundance of Proteobacteria and its affiliated genera, such as Kaistobacter, Rhodanobacter and Rhodoplanes. Copyright © 2017 Springer International Publishing AG, part of Springer Nature.
total organic carbon
CitationZou, Q., An, W., Wu, C., Li, W., Fu, A., Xiao, R., et al. (2018). Red mud-modified biochar reduces soil arsenic availability and changes bacterial composition. Environmental Chemistry Letters, 16(2), 615–622. doi: 10.1007/s10311-017-0688-1
- Microbial community
- Red mud