Thallium stable isotope fractionation in white mustard: Implications for metal transfers and incorporation in plants.

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ID: 962
2019
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Abstract
We studied thallium (Tl) isotope fractionation in white mustard grown hydroponically at different Tl doses. Thallium isotope signatures in plants indicated preferential incorporation of the light Tl isotope during Tl uptake from the nutrient solution. Negative isotope fractionation was even more pronounced in dependence on how much the available Tl pool decreased. This finding corresponds to the concept of isotope overprinting related to a high contamination level in the growing media (solution or soil). Regarding Tl translocation in plants, we observed a large Tl isotope shift with an enrichment in the heavy Tl isotope in the shoots relative to the roots in treatments with low/moderate solution Tl concentrations (0.01/0.05 mg Tl/L), with the corresponding αTl fractionation factors of ˜1.007 and 1.003, respectively. This finding is probably a consequence of specific (plant) reactions of Tl replacing K in its cycle. The formation of the S-coordinated Tl(I) complexes, potentially affecting both Tl accumulation and Tl isotope fractionation in plants, however, was not proven in our plants, since we did not have indication for that on the basis of X-ray absorption spectroscopy, suggesting that Tl was mainly present as free/hydrated Tl ion or chemically bound to O-containing functional groups.
Reference Key
vaněk2019thallium Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Vaněk, Aleš;Holubík, Ondřej;Oborná, Vendula;Mihaljevič, Martin;Trubač, Jakub;Ettler, Vojtěch;Pavlů, Lenka;Vokurková, Petra;Penížek, Vít;Zádorová, Tereza;Voegelin, Andreas;
Journal Journal of hazardous materials
Year 2019
DOI
S0304-3894(19)30187-6
URL
Keywords Keywords not found

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