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Towards a better knowledge of U(VI) speciation in weakly alkaline solution through an in-depth study of U(VI) intrinsic colloids.
Chemosphere
December 2024
Institut de Chimie Séparative de Marcoule, CEA, UMR 5257 CEA-CNRS-UM-ENSCM, 30207 Bagnols-sur-Cèze, France. Electronic address:
The formation of U(VI) intrinsic colloids has a non-negligible impact on the dissemination of actinides in the environment. It is therefore essential to better identify their nature, formation conditions, and stability domains. These specific points are especially important since the behavior of these elements in environment is generally estimated by geochemical transport modeling.
View Article and Find Full Text PDFSpeciation and Aqueous Dissolution of Macronutrients in Fire Ash: Variation across Ecosystems and the Effects on Nutrient Cycling.
Environ Sci Technol
December 2024
School of Environmental, Civil, Agricultural and Mechanical Engineering, University of Georgia, Athens 30602, Georgia, United States.
This study investigated the speciation and aqueous dissolution of macronutrients in fire ash from diverse ecosystems and speciation of ash and smoke from laboratory burning, exploring the variations and their causes. The speciation of phosphorus (P), calcium (Ca), and potassium (K) in fire ash from five globally distributed ecosystems was characterized by using X-ray absorption spectroscopy and sequential fractionation. Aqueous dissolution of the macronutrients was measured by batch experiments at acidic and alkaline pHs.
View Article and Find Full Text PDFMicroplastics aggravate the adverse effects of methylmercury than inorganic mercury on zebrafish (Danio rerio).
Environ Pollut
December 2024
Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, And Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture and Rural Affairs, Beijing, 100081, China. Electronic address:
The potential health risks of microplastics (MPs) and their combined exposure with heavy metals such as mercury (Hg) in aquatic environment are increasingly concerned recently. In this work, zebrafish embryos were exposed to different levels of polystyrene microplastics (PS-MPs, ∼0.1 μm) coupled with Hg(II) or/and MeHg at 20 μg/L, to investigate the tissue biodistribution and accumulation of PS-MPs and Hg species, and their interaction, as well as embryo toxicity, oxidative stress and metabolic profiles.
View Article and Find Full Text PDFHydrous ferric arsenate transformation coupled with As, Fe, and S environmental cycling in sulfidic systems under anoxic and circumneutral conditions.
Sci Total Environ
December 2024
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Despite many studies on the environmental cycling of As, Fe, and S, sulfide (S(-II))-induced hydrous ferric arsenate (HFA) transformation remains to be elucidated. Herein, we investigated the anaerobic reaction of HFA with S(-II) at three environmental concentrations (1, 10, and 50 mM) at pH 48. Changes in solid-phase As, Fe, and S speciation were investigated by XRD, FTIR, Raman, XPS, synchrotron XANES, SEM, and TEM.
View Article and Find Full Text PDFSpatial and Seasonal Variability of Remote and Urban Speciated Fine Particulate Matter in the United States.
J Geophys Res Atmos
December 2024
National Park Service Air Resources Division Lakewood CO USA.
Article Synopsis
- * Organic aerosols were found to be the most significant contributor to PM mass, accounting for over 40% annually, with biomass smoke influencing particulate organic matter and elemental carbon levels.
- * Seasonal variations in aerosol species were notable, particularly for particulate organic matter, fine dust, and ammonium nitrate, pointing to the need for further evaluation of how urban and rural emissions affect aerosol concentrations and atmospheric conditions.
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