Onsite quantifying electron donating capacity of dissolved organic matter

Yuan, Ying; Zhang, Hao; Wei, Yuquan; Si, Yanxiao; Li, Guanghe; Zhang, Fang

doi:10.1016/j.scitotenv.2019.01.178

Cited by 20 publications

(19 citation statements)

References 25 publications

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“…7A and S6 †), even though electron donating capacities have been shown to be affected by the molecular weight of NOMs. 154 Therefore, we conclude that breadths, like potentials, are largely invariant with NOM category and source. The average values of breadth are 1.63 AE 0.24 V for E pa1 (Fig.…”

Section: Quantitative Comparison Of Characteristic Potentialsmentioning

confidence: 71%

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Pavitt

Tratnyek

2019

Environ. Sci.: Processes Impacts

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Section: Quantitative Comparison Of Characteristic Potentialsmentioning

confidence: 71%

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Pavitt

Tratnyek

2019

Environ. Sci.: Processes Impacts

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“…One possible reason responsible for the results was that the relative hydrophilic components within compost-derived HAs had a higher concentration in aqueous solution system than the hydrophobic ones. Therefore, the hydrophilic components could complex with Fe(II) more easily and get a better PCP transformation than the hydrophobic ones. , Another reason was that hydrophilic components within compost-derived HAs would facilitate the release of the PCP absorbed on Fe(III) oxides, which would enhance the transformation of PCP in our systems. ,− …”

Section: Results and Discussionmentioning

confidence: 98%

“…Molecular weight (MW) of humic-like substances has been confirmed to influence the ETC of HAs, ,, so we speculated that the MW of compost-derived HAs would have effects on the bio-dechlorination of PCP during Fe(III) oxide reduction. In order to clarify the possible effects, high-performance size exclusion chromatography (HPSEC) was used to reveal the MW characterization of compost-derived HAs.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Therefore, the redox potential of Fe 2 O 3 would be higher than that of Fe 3 O 4 , resulting in the easier reduction of Fe 2 O 3 than Fe 3 O 4 by compost-derived HAs . Humic acids from different sources also present distinguished reducing abilities for Fe 2 O 3 and Fe 3 O 4 , which was mainly attributed to the differences of structures and redox properties of HAs. ,− The structure and redox properties of HAs were mainly impacted by the organic carbon precursors, the transformations that the organic carbon had undergone, and the environment of the isolated HAs . These three aspects of compost-derived HAs were all changing during composting and quite different from that of natural HAs. , Therefore, the abilities of compost-derived HAs to reduce Fe 2 O 3 and Fe 3 O 4 would be also different between compost-derived HAs samples from different compost stages, which would impact the concentration of Fe(II) in the system of PCP bio-dechlorination and further influence the bio-dechlorination of PCP.…”

Section: Results and Discussionmentioning

confidence: 99%

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Polarity and Molecular Weight of Compost-Derived Humic Acids Impact Bio-dechlorination of Pentachlorophenol

Yuan

et al. 2019

J. Agric. Food Chem.

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Compost-derived humic acids (HAs) as cheap soil conditioners have potential to facilitate pentachlorophenol (PCP) bio-dechlorination but lack proof and studies. To clarify this, PCP bio-dechlorination mediated by compost-derived HAs under Fe(III) reduction conditions was investigated. Reverse phase high-performance liquid chromatography and highperformance size exclusion chromatography were employed to identify the functional components within compost-derived HAs. Our results showed that compost-derived HAs facilitated the bio-dechlorination of PCP under Fe(III) reduction conditions, and four kinds of byproducts were detected during the process. The relatively hydrophilic and high molecular weight (MW) components within compost-derived HAs presented significant associations with the concentration of byproducts from biodechlorination of PCP in Fe 2 O 3 reduction conditions. In contrast, the hydrophobic and low MW components were the main functional components for PCP bio-dechlorination in Fe 3 O 4 reduction environment. These findings clarified the effects of polarity and MW of compost-derived HAs on PCP bio-dechlorination, giving clues to optimize composting technology to utilize compost products for in situ contamination remediation of paddy soil.

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“…Recent advances in electrochemical methods applied under well-controlled laboratory conditions enable more reliable characterization of the thermodynamic and kinetic properties of redox active solid matter in environmental samples, ,− but their practical applicability to evaluate ANA under field conditions has not been thoroughly examined. In remediation practice, measurement of the reduction potential ( E ) of well water samples has been widely used as a proxy abiotic reactivity. − However, conventional E measurements on water-only samples are not predictive of contaminant reduction rates in groundwater, mainly because they do not include the mineral surfaces on which the reactions occur .…”

Section: Introductionmentioning

confidence: 99%

Predicting Abiotic Reduction Rates Using Cryogenically Collected Soil Cores and Mediated Reduction Potential Measurements

Kocur

Fan

Tratnyek

et al. 2019

Environ. Sci. Technol. Lett.

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Abiotic reduction of contaminants in iron-based laboratory model systems has been studied extensively, but the resulting understanding is not sufficient to allow prediction of reaction rates under field conditions. This study demonstrates that rates of contaminant reduction by aquifer sediments can be predicted by combining several recent methodological innovations into an integrated protocol that is amenable to use on field samples. The protocol involves (i) cryogenic collection of core samples to preserve redox conditions, (ii) contaminant reduction rate measurements, (iii) oxidation–reduction potential measurements of sediments using electron shuttle-mediated potentiometry, and (iv) regression analysis of mass-normalized rate constants for contaminant reduction and reduction potential. The protocol was demonstrated using carbon tetrachloride as the model contaminant and 43 aquifer sediment samples from nine locations at four sites. The abiotic rate of degradation covers 5 orders of magnitude and a 450 mV potential range. The 95% confidence interval was used to represent the minimum reactivity that would be observed at each of the field sites under the measured reduction potentials. This provides a novel and effective protocol for screening abiotic reduction capabilities or establishing site specific rates.

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Onsite quantifying electron donating capacity of dissolved organic matter

Cited by 20 publications

References 25 publications

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Polarity and Molecular Weight of Compost-Derived Humic Acids Impact Bio-dechlorination of Pentachlorophenol

Predicting Abiotic Reduction Rates Using Cryogenically Collected Soil Cores and Mediated Reduction Potential Measurements

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