Chromium removal by microbial mats: understanding the effect of salinity and pH.

Autor: Morales-Pontet NG; Instituto Argentino de Oceanografía, CONICET - Universidad Nacional del Sur (UNS), Camino Carrindanga 7.5 Km, B8000FWB, Bahía Blanca, Argentina. nmpontet@iado-conicet.gob.ar.; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, B8000ICN, Bahía Blanca, Argentina. nmpontet@iado-conicet.gob.ar., Fernández C; Instituto de Investigaciones Bioquímicas de Bahía Blanca, CONICET - Universidad Nacional del Sur (UNS), Camino Carrindanga 7.5 Km, B8000FWB, Bahía Blanca, Argentina.; Centro de Emprendedorismo y Desarrollo Territorial Sostenible (CEDETS), Universidad Provincial del Sudoeste (UPSO) - Comisión de Investigaciones Científicas de La Provincia de Buenos Aires (CIC), Ciudad de Cali 320, B8003FTH, Bahía Blanca, Argentina., Botté SE; Instituto Argentino de Oceanografía, CONICET - Universidad Nacional del Sur (UNS), Camino Carrindanga 7.5 Km, B8000FWB, Bahía Blanca, Argentina.; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), San Juan 670, B8000ICN, Bahía Blanca, Argentina.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2024 Jul 03; Vol. 196 (8), pp. 686. Date of Electronic Publication: 2024 Jul 03.
DOI: 10.1007/s10661-024-12847-0
Abstrakt: Environmental contamination by chromium represents a serious public health problem. Therefore, it is crucial to develop and optimize remediation technologies to reduce its concentration in the environment. The aims of this study were to evaluate the uptake of chromium by live and complete microbial mats in experimental mesocosms under different pH and salinity conditions to understand how these factors affect the microphytobenthic community and, consequently, how chromium removal process is influenced. Microbial mats from the estuarine environment were exposed to 15 mg Cr/L under different pH (2, 4, and 8) and salinity (2, 15, and 33) conditions. Salinity, redox potential, and pH were measured throughout the trial in solutions and in microbial mats, while total Cr determinations were performed at the end of the assay. The results demonstrated that the removal efficiency of Cr by microbial mats was significantly improved in solutions at pH 2, remaining unaffected by variations in salinity. Notably, both cyanobacteria and diatoms showed remarkable resistance to Cr exposure under all conditions tested, highlighting their exceptional adaptability. Microbial mats have proved to be effective filters for reducing the concentration of chromium in aqueous solutions with varying pH and salinity levels.
(© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
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