Biologically Induced Mobilization of Arsenic Adsorbed onto Amorphous Ferric Oxyhydroxides in Aqueous Solution During Fungal Cultivation

Abstract

This paper evaluates heterotrophic leaching of arsenic (As) pre-adsorbed onto amorphous ferric o x y hy d r o x i d e s ( F e O x ) a nd i t s su b s e q ue n t biovolatilization under laboratory conditions during Aspergillus niger static cultivation. With initial 90 mg.L −1 As concentration and absence of FeOx, the biomass As accumulation capacity attained 1.4 mg.g −1 on the 15th day of cultivation. While FeOx suppressed As biomass accumulation up to 0.23 mg.g −1 , it did not influence biovolatilization activity. After 15-day cultivation, almost 1.8 mg As was released into the surrounding culture media, accumulated and subsequently transformed into its volatile derivatives, regardless of FeOx presence or absence. The A. niger strain was able to enhance As release from the FeOx surfaces; the total As medium concentration increased to 3.1 mg.L −1 on the 15th cultivation day, and this amount was considerably higher than the 0.128 mg.L −1 As concentration leached from FeOx in fungal absence. These observations indicate that complex mutual interactions between As immobilized in FeOx and filamentous fungi are environmentally significant regarding As mobility and transformation in oxic environments.

Biochemical response of Rhodotorula mucilaginosa and Cladosporium herbarum isolated from aquatic environment on iron(III) ions

“…In turn, the essential element of the iron(III) bioreduction process is the presence of chelating-forming microorganisms that produce metabolites capable of forming iron chelate complexes 15 . Thanks to the activity of microorganisms, numerous redox processes occur, which in combination with fungal organic matabolits play a very important role in biogeochemical cycles of metal circulation, causing on the one hand an increase in their toxicity, and on the other their inactivation 35,36 .…”

Effect of biosorption of Fe2+ by Rhodotorula mucilaginosa YMM19 on the physiology of Lupinus albus, Triticum aestivum, Vicia faba, and Zea mays seedlings

“…Figure 4a, b shows the shoot height besides root size of Lupinus albus, Triticum aestivum, and The existence of chelating-producing bacteria that create iron chelate complexes through the production of metabolites, in turn, is a crucial component of the Fe 3+ bioreduction process (Wetzel 2001). Various oxide reduction processes occur as a result of microorganism activity, which, along with fungous organic metabolites, play a vital role in metal circulation biogeochemical cycles, increasing their toxicity while also inactivating them (Urík et al 2014(Urík et al , 2018.…”

Fungal Selenium(VI) Accumulation and Biotransformation—Filamentous Fungi in Selenate Contaminated Aqueous Media Remediation

“…Filamentous fungi may also play a key role in selenium mobilization and its treatment in contaminated water, soil, and sediments. It is well known that fungal metabolism significantly contributes to toxic metal(loid) speciation changes via bioalkylation and leaching processes, and also by reduction, accumulation, and sorption in metal(loid) physico‐chemical interactions with fungal surfaces and exometabolites .…”