Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.scitotenv.2023.168351
Title (Primary) Changes in arsenic mobility and speciation across a 2000-year-old paddy soil chronosequence
Author Ninin, J.M.L.; Muehe, E.M.; Kölbl, A.; Mori, A.H.; Nicol, A.; Gilfedder, B.; Pausch, J.; Urbanski, L.; Lueders, T.; Planer-Friedrich, B.
Source Titel Science of the Total Environment
Year 2024
Department AME
Volume 908
Page From art. 168351
Language englisch
Topic T7 Bioeconomy
Abstract Rice accumulates arsenic (As) when cultivated under flooded conditions in paddy soils threatening rice yield or its safety for human consumption, depending on As speciation. During long-term paddy use, repeated redox cycles systematically alter soil biogeochemistry and microbiology. In the present study, incubation experiments from a 2000-year-old paddy soil chronosequence revealed that As mobilization and speciation also change with paddy soil age. Younger paddies (≤100 years) showed the highest total As mobilization, with speciation dominated by carcinogenic inorganic oxyarsenic species and highly mobile inorganic thioarsenates. Inorganic thioarsenates formed by a high availability of reduced sulfur (S) due to low concentrations of reducible iron (Fe) and soil organic carbon (SOC). Long-term paddy use (>100 years) resulted in higher microbial activity and SOC, increasing the share of phytotoxic methylated As. Methylated oxyarsenic species are precursors for cytotoxic methylated thioarsenates. Methylated thioarsenates formed in soils of all ages being limited either by the availability of methylated As in young soils or that of reduced-S in older ones. The present study shows that via a linkage of As to the biogeochemistry of Fe, S, and C, paddy soil age can influence the kind and the extent of threat that As poses for rice cultivation.
Persistent UFZ Identifier
Ninin, J.M.L., Muehe, E.M., Kölbl, A., Mori, A.H., Nicol, A., Gilfedder, B., Pausch, J., Urbanski, L., Lueders, T., Planer-Friedrich, B. (2024):
Changes in arsenic mobility and speciation across a 2000-year-old paddy soil chronosequence
Sci. Total Environ. 908 , art. 168351 10.1016/j.scitotenv.2023.168351