Thallium in environmental compartments affected by acid mine drainage (AMD) from the Iberian Pyrite Belt (IPB): From rocks to the ocean

Cánovas, Carlos Ruiz; Basallote, M. Dolores; Macías, Francisco; Álvarez, Manuel Olías; Pérez‐López, Rafael; Nieto, José Miguel

doi:10.1016/j.earscirev.2022.104264

Cited by 7 publications

(2 citation statements)

References 77 publications

(113 reference statements)

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“…Furthermore, Fe is one of the most important accompanying elements of Tl, with dozens to thousands of times higher concentrations than Tl in Tl-polluted waters. ,, The Fe(III)/Fe(II) cycle, which is well reported impacted by light, , can also influence Tl speciation in acidic sunlit environments. ,, As we previously reported that the generation of • OH from the Fe(III) photoreduction can induce Tl(I) oxidation under irradiated conditions, we provided further insights here that the concentration ratios of Fe(III) and SRFA will significantly influence the redox transformations of Tl, with the rate and extent of Tl(I) photooxidation enhanced and Tl(III) photoreduction inhibited with increasing Fe(III) concentration (Figure S20). The SRFA-mediated Fe(III) transformations are expected to influence the photoreactivity of Fe(III) species and thus the Tl speciation in irradiated SRFA solutions.…”

Section: Environmental Implicationsmentioning

confidence: 52%

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Sunlight-Mediated Reductive Transformation of Thallium(III) in Acidic Natural Organic Matter Solutions: Mechanisms and Kinetic Modeling

Huang

Huangfu

2023

Environ. Sci. Technol.

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Thallium (Tl) redox state determines its speciation and fate in aqueous environments. Despite the high potential of natural organic matter (NOM) providing the reactive groups to complex and reduce Tl(III), the kinetics and mechanisms by which NOM influences the Tl redox transformation have remained insufficiently understood. Here, we studied the reduction kinetics of Tl(III) in acidic Suwannee River fulvic acid (SRFA) solutions under dark and solar-irradiated conditions. Our results show that the thermal Tl(III) reduction occurs by the reactive organic moieties in SRFA, with the electron-donating capacities of SRFA increased with pH and decreased with [SRFA]/[Tl(III)] ratios. Solar irradiation promoted Tl(III) reduction in SRFA solutions as a result of ligand-to-metal charge transfer (LMCT) within the photoactive Tl(III) species as well as an additional reduction process mediated by a photogenerated superoxide. We demonstrated that the formation of Tl(III)–SRFA complexes decreased the reducibility of Tl(III), with the kinetics dependent on the nature of the binding component and SRFA concentrations. A “three ligand class” kinetics model has been developed and satisfactorily describes Tl(III) reduction kinetics over a range of experimental conditions. The insights presented here should assist in understanding and predicting the NOM-mediated speciation and redox cycle of Tl in a sunlit environment.

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Section: Environmental Implicationsmentioning

confidence: 52%

“…Furthermore, Fe is one of the most important accompanying elements of Tl, 65 with dozens to thousands of times higher concentrations than Tl in Tl-polluted waters. 9,66,67 The Fe(III)/Fe(II) cycle, which is well reported impacted by light, 19,68 can also influence Tl speciation in acidic sunlit environments.…”

Section: Environmental Implicationsmentioning

confidence: 99%