Fate and chemical speciation of antimony (Sb) during uptake, translocation and storage by rye grass using XANES spectroscopy
| Autor: | Ying Ji, Rainer Schulin, Susan Tandy, Géraldine Sarret |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Antimony
0106 biological sciences Health Toxicology and Mutagenesis media_common.quotation_subject Antimonite chemistry.chemical_element 010501 environmental sciences Toxicology Plant Roots 01 natural sciences Lolium perenne chemistry.chemical_compound Nutrient Botany Lolium Soil Pollutants 0105 earth and related environmental sciences media_common biology food and beverages General Medicine biology.organism_classification Pollution XANES Speciation X-Ray Absorption Spectroscopy chemistry Seedlings Shoot Antimonate Environmental Monitoring 010606 plant biology & botany Nuclear chemistry |
| Zdroj: | Environmental Pollution. 231:1322-1329 |
| ISSN: | 0269-7491 |
| DOI: | 10.1016/j.envpol.2017.08.105 |
| Popis: | Antimony (Sb) is a contaminant of increased prevalence in the environment, but there is little knowledge about the mechanisms of its uptake and translocation within plants. Here, we applied for the synchrotron based X-ray absorption near-edge structure (XANES) spectroscopy to analyze the speciation of Sb in roots and shoots of rye grass (Lolium perenne L. Calibra). Seedlings were grown in nutrient solutions to which either antimonite (Sb(III)), antimonate (Sb(V)) or trimethyl-Sb(V) (TMSb) were added. While exposure to Sb(III) led to around 100 times higher Sb accumulation in the roots than the other two treatments, there was no difference in total Sb in the shoots. Antimony taken up in the Sb(III) treatment was mainly found as Sb-thiol complexes (roots: >76% and shoots: 60%), suggesting detoxification reactions with compounds such as glutathione and phytochelatins. No reduction of accumulated Sb(V) was found in the roots, but half of the translocated Sb was reduced to Sb(III) in the Sb(V) treatment. Antimony accumulated in the TMSb treatment remained in the methylated form in the roots. By synchrotron based XANES spectroscopy, we were able to distinguish the major Sb compounds in plant tissue under different Sb treatments. The results help to understand the translocation and transformation of different Sb species in plants after uptake and provide information for risk assessment of plant growth in Sb contaminated soils. |
| Databáze: | OpenAIRE |
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