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Start date: 2023Subject: search.filters.subject.Arsenic

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    Synergistic role of PGPR and fungal isolates in mitigating As and Pb stress and promoting growth of Arachis hypogaea L.
    (2026-01-01)
    Sathya, C.
    ;
    Sridhar, D.
    ;
    Soytong, K.
    ;
    Song, J. J.
    ;
    Lalitha, S.
    Heavy metals, also known as toxic metals, are major environmental pollutants that adversely impact all forms of life, disturbing soil ecology and reducing agricultural productivity. Certain indigenous microbes possess remarkable tolerance to these metals and play a vital role in restoring contaminated soils. In the present study, plant growth-promoting rhizobacteria and fungi were isolated from the rhizosphere and evaluated for their metal tolerance potential. Among the bacterial isolates (Pseudomonas alcaliphila PAS1, Pseudomonas aeruginosa PAS2, Pseudomonas toyotomiensis PTS3, Bacillus subtilis BSS1) expressing resistance to arsenic and lead which observed up to concentrations of 100–1200 ppm on nutrient agar. The fungal isolate Aspergillus japonicus (AJ01) exhibited tolerance up to 200 ppm of Pb and 500 ppm of As. Pot culture experiments were using Arachis hypogaea grown under As and Pb stresses with treatments of PGPR, PGPF, Compost and chemical control. Pseudomonas alcaliphila PAS1 was significantly enhanced plant growth by 100% and Pseudomonas aeruginosa PAS2 by 60% in contaminated soil, indicating strong tolerance and growth-promoting potential. Pseudomonas alcaliphila PAS1 increased chlorophyll content by 92.3% under As stress as compared to the control, while Pseudomonas toyotomiensis PTS3 showed a 70% increased, demonstrating high metal tolerance. In contrast, As and Pb stressed plants showed adverse effects. These findings highlighted the potential of selected PGPR and fungi as eco-friendly alternatives for the remediation and recovery of heavy metal-contaminated soils in Arachis hypogaea cultivation.
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    Synergistic effect of arsenic removal from petroleum condensate via liquid-liquid extraction: Thermodynamics, kinetics, DFT and McCabe-Thiele method
    (2023-12-01)
    Purktimatanont, Kittamuk
    ;
    Mohdee, Vanee
    ;
    Pancharoen, Ura
    ;
    Maneeintr, Kreangkrai
    ;
    Punyain, Wikorn
    This work presents the purification of petroleum condensate by removing arsenic ions via liquid-liquid extraction (LLE). Influence of pure and synergistic extractants is investigated. In terms of the practicability, following parameters are examined: the type of extractant, operating time, and temperature. Response surface methodology is used to design parameters such as organic-aqueous ratio and extractant concentration. Under optimal conditions; a mixture of 1 mol/L HCl and 0.02 mol/L thiourea with an organic/aqueous ratio of 1:4 at 323.15 K for 60 min, the extraction of arsenic reached 78.2 %. Further, batch simulation via two-stage counter-current extraction, and estimation by McCabe-Thiele diagram proved to be enhanced arsenic extraction to 95.3 %. Analysis by FTIR show that arsenic ions in petroleum condensate are formed as triphenylarsine compound ((C<inf>6</inf>H<inf>5</inf>)<inf>3</inf>As). The process of arsenic removal proved to be zero-order endothermic, irreversible and spontaneous reaction. The results obtained from the density functional theory (DFT) confirm that arsenic ions react with the synergistic extractant: effectively forming a covalent bond (As–S).