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Title: Dispersible Colloid Facilitated Release of Organic Carbon From Two Contrasting Riparian Sediments

Abstract

In aqueous systems, including groundwater, nano-colloids (1–100 nm diameter) and small colloids (<450 nm diameter) provide a vast store of surfaces to which organic carbon (OC) can sorb, precluding its normal bioavailability. Because nanomaterials are ubiquitous and abundant throughout Earth systems, it is reasonable that they would play a significant role in biogeochemical cycles. As such, mineral nano-colloids (MNC) and small colloids, formed through mineral weathering and precipitation processes, are both an unaccounted-for reservoir and unquantified vector for transport of OC and nutrients and contaminants within watersheds. Water extractions and leaching experiments were conducted under (1) aerobic (ambient) and (2) anaerobic (environmental chamber) conditions for each of two contrasting riparian sediments from (1) Columbia River, Washington and (2) Tims Branch, South Carolina. Water dispersible colloid-adsorbed OC was as high as 48% of OC for Tims Branch anaerobic batch water extraction and as low as 0% for Columbia River aerobic batch water extractions. Anaerobic leaching from column experiments yielded higher colloid and OC release rates. Transmission electron microscopy with electron dispersive spectroscopy mapping revealed organic carbon associated with aggregations of nano-particulate silicate minerals and Mossbauer identified nano-particulate goethite. This exploratory study demonstrates that mineral facilitated release of OC in riparian sedimentsmore » is both significant and variable between locations.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1756128
Resource Type:
Published Article
Journal Name:
Frontiers in Water
Additional Journal Information:
Journal Name: Frontiers in Water Journal Volume: 2; Journal ID: ISSN 2624-9375
Publisher:
Frontiers Media SA
Country of Publication:
Switzerland
Language:
English

Citation Formats

Rod, Kenton A., Patel, Kaizad F., Kumar, Swatantar, Cantando, Elizabeth, Leng, Weinan, Kukkadapu, Ravi K., Qafoku, Odeta, Bowden, Mark, Kaplan, Daniel I., and Kemner, Kenneth M.. Dispersible Colloid Facilitated Release of Organic Carbon From Two Contrasting Riparian Sediments. Switzerland: N. p., 2020. Web. https://doi.org/10.3389/frwa.2020.560707.
Rod, Kenton A., Patel, Kaizad F., Kumar, Swatantar, Cantando, Elizabeth, Leng, Weinan, Kukkadapu, Ravi K., Qafoku, Odeta, Bowden, Mark, Kaplan, Daniel I., & Kemner, Kenneth M.. Dispersible Colloid Facilitated Release of Organic Carbon From Two Contrasting Riparian Sediments. Switzerland. https://doi.org/10.3389/frwa.2020.560707
Rod, Kenton A., Patel, Kaizad F., Kumar, Swatantar, Cantando, Elizabeth, Leng, Weinan, Kukkadapu, Ravi K., Qafoku, Odeta, Bowden, Mark, Kaplan, Daniel I., and Kemner, Kenneth M.. Thu . "Dispersible Colloid Facilitated Release of Organic Carbon From Two Contrasting Riparian Sediments". Switzerland. https://doi.org/10.3389/frwa.2020.560707.
@article{osti_1756128,
title = {Dispersible Colloid Facilitated Release of Organic Carbon From Two Contrasting Riparian Sediments},
author = {Rod, Kenton A. and Patel, Kaizad F. and Kumar, Swatantar and Cantando, Elizabeth and Leng, Weinan and Kukkadapu, Ravi K. and Qafoku, Odeta and Bowden, Mark and Kaplan, Daniel I. and Kemner, Kenneth M.},
abstractNote = {In aqueous systems, including groundwater, nano-colloids (1–100 nm diameter) and small colloids (<450 nm diameter) provide a vast store of surfaces to which organic carbon (OC) can sorb, precluding its normal bioavailability. Because nanomaterials are ubiquitous and abundant throughout Earth systems, it is reasonable that they would play a significant role in biogeochemical cycles. As such, mineral nano-colloids (MNC) and small colloids, formed through mineral weathering and precipitation processes, are both an unaccounted-for reservoir and unquantified vector for transport of OC and nutrients and contaminants within watersheds. Water extractions and leaching experiments were conducted under (1) aerobic (ambient) and (2) anaerobic (environmental chamber) conditions for each of two contrasting riparian sediments from (1) Columbia River, Washington and (2) Tims Branch, South Carolina. Water dispersible colloid-adsorbed OC was as high as 48% of OC for Tims Branch anaerobic batch water extraction and as low as 0% for Columbia River aerobic batch water extractions. Anaerobic leaching from column experiments yielded higher colloid and OC release rates. Transmission electron microscopy with electron dispersive spectroscopy mapping revealed organic carbon associated with aggregations of nano-particulate silicate minerals and Mossbauer identified nano-particulate goethite. This exploratory study demonstrates that mineral facilitated release of OC in riparian sediments is both significant and variable between locations.},
doi = {10.3389/frwa.2020.560707},
journal = {Frontiers in Water},
number = ,
volume = 2,
place = {Switzerland},
year = {2020},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.3389/frwa.2020.560707

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