Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.scitotenv.2023.168351
Titel (primär) Changes in arsenic mobility and speciation across a 2000-year-old paddy soil chronosequence
Autor 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.
Quelle Science of the Total Environment
Erscheinungsjahr 2024
Department AME
Band/Volume 908
Seite von art. 168351
Sprache 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.
dauerhafte UFZ-Verlinkung
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