Characterization and microbial utilization of dissolved lipid organic fraction in arsenic impacted aquifers (India)

Ghosh, Devanita; Routh, Joyanto; Bhadury, Punyasloke

doi:10.1016/j.jhydrol.2015.04.051

Cited by 32 publications

(29 citation statements)

References 72 publications

(114 reference statements)

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“…In addition, well 204 shows presence of various LMW n-alkanes resulting in a bimodal distribution pattern. A similar bimodal distribution pattern has been observed in the DOC fraction in this well (Ghosh et al, 2015a), suggesting input of surface derived OM and/or mixing of surface and in-situ sedimentary OM (Harvey et al, 2002;Mukherjee and Fryar, 2008). The bimodal pattern can also arise from degradation of complex OM sources in the deeper sediments.…”

Section: Organic Geochemical Characteristics Of Gsassupporting

confidence: 78%

“…Such biomarker signatures have also recently been reported from the other As-contaminated aquifers of SE Asia, indicating their critical role in As-mobilization (Magnone et al, 2017). This inference however, needs further investigations involving microbial degradation of OM in sediments on similar lines as established in DOC extracted from these wells (Ghosh et al, 2015a), using tracer compounds in laboratory and in situ measurements of degradation products and As levels in the microbial cultures.…”

Section: Organic Geochemical Characteristics Of Gsassupporting

confidence: 52%

“…Distribution of different biomarkers (n-alkanes, n-alkanols, and n-alkanoic acids) in the sediment profiles show a striking correspondence with groundwater DOC characteristics in Karimpur (Ghosh et al, 2015a). The sediments indicate predominance of HMW n-alkanes that are of terrestrial origin.…”

Section: Organic Geochemical Characteristics Of Gsasmentioning

confidence: 79%

“…In addition, we have indicated signature of petroleum degrading microbial communities (Ghosh et al, 2014) and microbially reworked petroleum hydrocarbons (LMW-UCM) in the DOC fraction (Ghosh et al, 2015a). These compounds are suggested to affect microbial reductive dissolution of As (Rowland et al, 2006;Paul et al, 2015).…”

Section: Organic Geochemical Characteristics Of Gsasmentioning

confidence: 87%

“…The earlier studies on characterization of OM sources in the sediments and DOC pool, had shown typical presence of thermally mature petroleum-derived hydrocarbons in addition to the various terrigenous sources (Rowland et al, 2006;Ghosh et al, 2015a). Such, hydrocarbons are complex organic carbon sources, and only specific microbial communities can metabolize them.…”

Section: Introductionmentioning

confidence: 99%

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Sub-surface Biogeochemical Characteristics and Its Effect on Arsenic Cycling in the Holocene Gray Sand Aquifers of the Lower Bengal Basin

Ghosh

Routh

Bhadury

2017

Front. Environ. Sci.

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High arsenic (As) content in the fertile delta plains of West Bengal has been widely reported since the 1990s. The shallow gray sand aquifers (GSA) deposited during the Holocene, are more commonly used as potable water sources, but they have high As levels. The release of As into groundwater is influenced by indigenous microbial communities metabolizing different organic carbon sources present in the GSA sediments. After pre-screening the groundwater for assessing their microbial phylogenetic diversity, two 50-m deep boreholes were drilled in the GSAs, and 19 sediment samples were recovered from each core. In each of these samples, grain-size distribution, sequential extraction, and quantification of trace metals and total extractable lipids were analyzed. The aquifer sediments consisted of medium to fine micaceous sand with clay lenses in between them; a thick clay layer occurred on top of both boreholes. Arsenic concentration in these sediments varied from 1.80 to 41.0 mg/kg and was mostly associated with the oxide and silicate-rich crystalline minerals. Arsenic showed a significant correlation with Fe in all fractions, suggesting the presence of Fe-(oxy)-hydroxides bound As minerals. The diagnostic lipid biomarkers showed presence of compounds derived from higher plants (epicuticular waxes) and microbial inputs. The biomarkers were abundant in clay and silt-rich layers. The samples indicated preferential preservation of n-alkanes over other functional compounds (e.g., alcohols and fatty acids), that are more reactive, and hence subject to further degradation. Sediments recovered from the borehole indicated the presence of Eustigmatophytes and vascular plant waxes that are mostly surface-derived. The sedimentary lipids also indicated the presence of complex petroleum-derived hydrocarbons. These compounds provide organic substrates, and support the preferential survival of specific microbial communities in these sediments.

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Section: Organic Geochemical Characteristics Of Gsassupporting

confidence: 78%

Section: Organic Geochemical Characteristics Of Gsassupporting

confidence: 52%

Section: Organic Geochemical Characteristics Of Gsasmentioning

confidence: 79%

Section: Organic Geochemical Characteristics Of Gsasmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Sub-surface Biogeochemical Characteristics and Its Effect on Arsenic Cycling in the Holocene Gray Sand Aquifers of the Lower Bengal Basin

Ghosh

Routh

Bhadury

2017

Front. Environ. Sci.

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Coping with arsenic stress: Adaptations of arsenite‐oxidizing bacterial membrane lipids to increasing arsenic levels

2018

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Elevated levels of arsenic (As) in aquifers of South East Asia have caused diverse health problems affecting millions of people who drink As‐rich groundwater and consume various contaminated agriculture products. The biogeochemical cycling and mobilization/immobilization of As from its mineral‐bound phase is controlled by pH, oxic/anoxic conditions, and different microbial processes. The increased As flux generated from ongoing biogeochemical processes in the subsurface in turn affects the in situ microbial communities. This study analyzes how the indigenous arsenite‐oxidizing bacteria combat As stress by various biophysical alterations and self‐adaptation mechanisms. Fifteen arsenite‐oxidizing bacterial strains were isolated and identified using a polyphasic approach. The bacterial strains isolated from these aquifers belong predominantly to arsenite‐oxidizing bacterial groups. Of these, the membrane‐bound phospholipid fatty acids (PLFA) were characterized in seven selected bacterial isolates grown at different concentrations of As(III) in the medium. One of the significant findings of this study is how the increase in external stress can induce alteration of membrane PLFAs. The change in fatty acid saturation and alteration of their steric conformation suggests alteration of membrane fluidity due to change in As‐related stress. However, different bacterial groups can have different degrees of alteration that can affect sustainability in As‐rich aquifers of the Bengal Delta Plain.

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Microbial Cycling of Arsenic in the Aquifers of Bengal Delta Plains (BDP)

Ghosh

Bhadury

2018

Advances in Soil Microbiology: Recent Trends and Future Prospects

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Characterization and microbial utilization of dissolved lipid organic fraction in arsenic impacted aquifers (India)

Cited by 32 publications

References 72 publications

Sub-surface Biogeochemical Characteristics and Its Effect on Arsenic Cycling in the Holocene Gray Sand Aquifers of the Lower Bengal Basin

Sub-surface Biogeochemical Characteristics and Its Effect on Arsenic Cycling in the Holocene Gray Sand Aquifers of the Lower Bengal Basin

Coping with arsenic stress: Adaptations of arsenite‐oxidizing bacterial membrane lipids to increasing arsenic levels

Microbial Cycling of Arsenic in the Aquifers of Bengal Delta Plains (BDP)

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