Effects of Dissolved Organic Matter on the Bioavailability of Heavy Metals During Microbial Dissimilatory Iron Reduction: A Review

Li, Yuanhang; Gong, Xiaofeng

doi:10.1007/398_2020_63

Cited by 15 publications

(9 citation statements)

References 121 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dissimilatory iron reduction driven by micro-organisms is a key process of the soil biogeochemical cycle [1]. To date, dissimilatory Fe(III)-reducing bacteria have been isolated from a variety of anaerobic environments, such as groundwater, lake sediments [2] and paddy soils [3].…”

Section: Introductionmentioning

confidence: 99%

Geothrix fuzhouensis sp. nov. and Geothrix paludis sp. nov., two novel Fe(III)-reducing bacteria isolated from paddy soil

Han

Yang

Tang

et al. 2023

International Journal of Systematic and Evolutionary Microbiology

View full text Add to dashboard Cite

Two anaerobic, Fe(III)-reducing and Gram-stain-negative strains, designated SG12T and SG195T, were isolated from paddy soils in Fujian Province, PR China. Phylogenetic trees based on 16S rRNA genes and conserved core genes from genomes indicated that strains SG12T and SG195T clustered with members of the genus Geothrix. The two strains showed the highest 16S rRNA sequences similarities to the type strains of ‘Geothrix terrae’ SG184T (98.4–99.6 %), ‘Geothrix alkalitolerans’ SG263T (98.4–99.6 %) and Geothrix fermentans DSM 14018T (98.2–98.8 %). The average nucleotide identity and digital DNA–DNA hybridization values between the two strains and the closely related Geothrix species were 85.1–93.5 % and 29.8–52.9 %, respectively, lower than the cut-off level for prokaryotic species delineation. The menaquinone was MK-8 in both strains. The major fatty acids were iso-C15 : 0, anteiso-C15 : 0 and C16 : 0. Additionally, the two strains possessed iron reduction ability and could utilize organics such as benzene and benzoic acid as electron donors to reduce ferric citrate to ferrous iron. Based on the morphological, biochemical, chemotaxonomic and genome data, the two isolated strains represent two novel species of the genus Geothrix , for which the names Geothrix fuzhouensis sp. nov. and Geothrix paludis sp. nov. are proposed. The type strains are SG12T (=GDMCC 1.3407T=JCM 39330T) and SG195T (= GDMCC 1.3308T=JCM 39327T), respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Geothrix fuzhouensis sp. nov. and Geothrix paludis sp. nov., two novel Fe(III)-reducing bacteria isolated from paddy soil

Han

Yang

Tang

et al. 2023

International Journal of Systematic and Evolutionary Microbiology

View full text Add to dashboard Cite

show abstract

“…Most iron (hydr)oxides are thermodynamically stable, but their structural Fe can be mobilized through biotic and abiotic reductive dissolution. , Biotic reduction of Fe(III) present in iron (hydr)oxides generally takes place in anaerobic soils and sediments, − where microorganisms can reduce Fe(III) through intracellular metabolism − or extracellular electron transfer. ,− Abiotic reduction of Fe(III) within iron (hydr)oxides mainly includes chemical reduction and photoreduction. Chemical reduction needs reductants, such as sulfides and natural organic matters (NOM), to directly donate electrons to iron (hydr)oxides. ,− During photoreduction processes, photoelectrons can be generated in iron (hydr)oxides to reduce Fe(III), because of their semiconductor characteristics and/or photolysis characteristics. − In additon, sunlight can also accelerate electron transfer from ligands to iron (hydr)oxides for Fe(III) reduction. − Sunlight can easily penetrate through air, and has a penetration depth from a few meters to hundreds of meters in water and from hundreds of micrometers to several millimeters in sediments. − In this term, the photoreduction of iron (hydr)oxides can occur in air, water, and sediments.…”

Section: Introductionmentioning

confidence: 99%

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

Liu

Zhu

et al. 2022

ACS Earth Space Chem.

View full text Add to dashboard Cite

Iron (hydr)oxides are the most abundant metal oxides, which are widespread on Earth’s surface in the major form of micro/nanoparticles. Dissolution of iron (hydr)oxides significantly controls their compositions on Earth’s surface and is a critical step for the global Fe cycling. Photoreductive dissolution of iron (hydr)oxides is recognized as one of the most important process for generating Fe2+ in surface water and is also a common pathway for transforming solar energy into chemical energy. This review article dissects the main characteristics of photoreductive dissolution of iron (hydr)oxides and discusses its geochemical and environmental significance. We categorize the mechanisms for photoreduction of iron (hydr)oxides into three types: reduction by intrinsic photogenerated electrons, reduction by ligand to metal electron transfer (LMCT), and reduction by direct injection of exogenous photoelectrons. The efficiency of photoreductive dissolution is constrained by both the structure of iron (hydr)oxides (e.g., crystal structure and particle size) and environmental conditions (e.g., light, pH, and concurrent chemicals). Therefore, different iron (hydr)oxides may exhibit quite distinctive photoreductive dissolution characteristics because of their unique crystal structures and physicochemical properties. Iron (hydr)oxides with low crystallinity (e.g., ferrihydrite, lepidocrocite) are subject to direct photoreductive dissolution, while those with high crystallinity (e.g., goethite, hematite) generally need ligands to proceed with photoreductive dissolution. The photoreductive dissolution of iron (hydr)oxides is involved in many important geochemical and environmental processes, such as the Fe availability to primary producers, the generation of reactive oxygen species, the transportation and fate of contaminants, and the phase transformation of iron (hydr)oxides. Given the ubiquitous occurrence of photoreductive dissolution of iron (hydr)oxides, this review will advance our understanding of the role of this process in Earth’s surface environments.

show abstract

“…Metals in the river system exist in different chemical forms associated with organic, residual, exchangeable, carbonate fractions and those bound to, for instance iron oxides, manganese oxides, chromates, metal chlorides, and metal sulphates (Geng et al, 2020). Factors including physical and chemical equilibrium, pH, redox reactions, oxidation states of elements and sediment attributed organic matter control heavy metal distribution and accumulation in sediments (Li and Gong, 2021). The mobility and bioavailability of metals in river systems is largely dependent on sediment transport dynamics which is influenced by several factors such as pH, redox potential, organic matter, temperature, dissolved organic carbon, salinity, composition of the sediment, particle size, and grain texture (Debnath et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

The use of water quality index and water pollution index in assessing the water quality and suitability of the river Molo water basin, Kenya

Kipsang

Kibet

Adongo

2022

EAJSTI

View full text Add to dashboard Cite

Water quality assessment has become a very essential scientific procedure for qualifying water for drinking and general purpose use, and better public health policy on clean water supply. Various tools have been employed to determine the status of water systems for drinking, industrial and general use. For the purpose of this study, water quality index (WQI) and the recently developed water pollution index (WPI) have been adopted to evaluate the water of the Molo water basin. The world health organization (WHO) has defined limits of these parameters beyond which the quality of water is considered unsuitable for a specific use. The study was carried out in December, 2021 during the dry season. In this contribution, pH, conductivity, TDS, salinity, major cations and anions, and selected heavy metals were explored. Of the major cations Na reported the highest concentration at 1800 mg/L whereas in the anion category, the Cl gave the highest concentration at 110 mg/L. The highest pH, TDS and salinity were 8.5, 146.33, and 282.67, respectively. The data obtained were used to determine the water quality index (WQI) and water pollution index (WPI) of the Molo water basin based on the world health organization (WHO) standards. The average WQI obtained was 57.47 indicating that the water is slightly polluted. Also the average WPI obtained was 0.77 indicating that the water from the water basin is not of good quality. Sediment morphology and composition was also determined using energy dispersive X-ray spectroscopy (EDS). The findings showed the presence of heavy metal pollutants of concern which include lead, manganese and copper. Therefore, with respect to WQI, WPI and sediment morphology, the water basin is significantly polluted. There is need therefore for the government and health authorities to formulate policies aimed at regulating pollution activities which may endanger the Molo water basin.

show abstract

Effects of Dissolved Organic Matter on the Bioavailability of Heavy Metals During Microbial Dissimilatory Iron Reduction: A Review

Cited by 15 publications

References 121 publications

Geothrix fuzhouensis sp. nov. and Geothrix paludis sp. nov., two novel Fe(III)-reducing bacteria isolated from paddy soil

Geothrix fuzhouensis sp. nov. and Geothrix paludis sp. nov., two novel Fe(III)-reducing bacteria isolated from paddy soil

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

The use of water quality index and water pollution index in assessing the water quality and suitability of the river Molo water basin, Kenya

Contact Info

Product

Resources

About