Characterization of Natural Organic Matter and Humic Substance Isolates by Size Exclusion Chromatography following Reduction with Sodium Borohydride DOI Creative Commons
Hang Li,

Blair Hanson,

Garrett McKay

et al.

ACS Environmental Au, Journal Year: 2024, Volume and Issue: 5(2), P. 197 - 210

Published: Dec. 20, 2024

Chemical reduction with sodium borohydride has been used for over four decades to probe the presence and function of carbonyl-containing moieties in dissolved organic matter (DOM). One these structure–property relationships is attenuation UV–visible absorbance after reduction, an effect that observed universally across DOM different origins. We previously demonstrated similar bulk physicochemical properties exhibits bifurcating reactivity depending on source (i.e., soil vs. aquatic), as judged by kinetics fractional removal during at a fixed borohydride:DOM mass ratio. This result data from other studies suggest portion borohydride-reducible chromophores may be inaccessible water solvent, explaining incomplete even very high excesses. Here, we study five isolates via size exclusion chromatography coupled total carbon, absorbance, fluorescence detectors. Reduction resulted quantifiable yet exceedingly small decreases molecular weight, suggesting carbonyl groups alcohols does not markedly impact secondary structure. Interestingly, higher weight exhibited most prominent changes optical larger molecules contain proportion moieties. Optical surrogates were inversely correlated single isolate, both native reduced. However, correlation broke down lower weights, wherein remained constant continued elution volume, there intrinsic limit ability capture further weight. Overall, results provide insights into structure help inform future applications studying reactivity.

Language: Английский

Difference analysis of organic matter-mediated heavy metal pollution in the sediments of urban water bodies DOI
Wenzhong Tang,

Liu Sun,

Zhu Yu-feng

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 968, P. 178747 - 178747

Published: Feb. 17, 2025

Language: Английский

Citations

4
Mechanistic Insight into Multiple Effects of Copper Ion on the Photoreactivity of Dissolved Organic Matter DOI
Zhansheng Li, Hongxia Zhao,

Jitao Lv

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 487, P. 137124 - 137124

Published: Jan. 5, 2025

Language: Английский

Citations

1
Natural Organic Matter Stabilizes Pristine Nanoplastics but Destabilizes Photochemical Weathered Nanoplastics in Monovalent Electrolyte Solutions DOI Creative Commons
Yanghui Xu,

Xintu Wang,

Jan Peter van der Hoek

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Photochemical weathering and eco-corona formation through natural organic matter (NOM) adsorption play vital roles in the aggregation tendencies of nanoplastics (NPs) aquatic environments. However, it remains unclear how photochemical alters patterns NOM conformation eco-corona, subsequently affecting NPs. This study examined effect Suwannee River on kinetics pristine photoaged polystyrene (PS) NPs monovalent electrolyte solutions. The results showed that influenced which, turn, determined NP stability presence NOM. Hydrophobic components predominantly bound to hydrophobic π–π interactions, extended hydrophilic segments water hindered via steric repulsion. Conversely, hydrogen bonding facilitated binding these multiple NPs, thereby destabilizing them polymer bridging. Additionally, stabilization destabilization capacities increased with its concentration molecular weight. These findings shed light role weathered offering new perspectives environmental colloidal chemistry fate complex

Language: Английский

Citations

1
Water Transit Time Explains the Concentration, Quality and Reactivity of Dissolved Organic Carbon in an Alpine Stream DOI Creative Commons
Giulia Grandi, Núria Catalán, Susana Bernal

et al.

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(3)

Published: March 1, 2025

Abstract The amount and quality of dissolved organic carbon (DOC) exported from terrestrial to riverine ecosystems are critical factors influencing aquatic metabolism ecosystem health in streams, rivers, lakes. This study investigates the interplay between hydrologic conditions DOC dynamics an alpine catchment, focusing on how concentration shift during baseflow, snowmelt, storm events. Such were explored Oberer Seebach basin (Austria) where sub‐daily data, along with high resolution excitation‐emission matrices absorbance spectra, used characterize quality. We quantitatively linked pathways by advancing a framework that couples water age, which tracks time spends within Reactivity Continuum model, quantifies evolution reactivity ensuing concentration. Results show simulating both age effectively reproduces concentrations reveals correlation modeled observed indices. During snowmelt events, rapid transport reactive profile similar freshly formed DOC, while slower carry less signature preceding degradation processes. These findings shed light role catchment hydrology cycling its implications for functioning.

Language: Английский

Citations

0
Patterns of water‐extractable soil organic matter in the US Great Plains: Insights from the Haas Soil Archive DOI Creative Commons
Jonathan J. Halvorson, Angela M. Hansen, Catherine E. Stewart

et al.

Agrosystems Geosciences & Environment, Journal Year: 2025, Volume and Issue: 8(2)

Published: March 31, 2025

Abstract Novel approaches that are fast and sensitive needed to evaluate soil change integrate ecosystem properties. Carbon (C) nitrogen (N) extracted from with water associated plant nutrients microbial activity but information about over time in the US Great Plains is sparse. We used cool (20°C) hot (80°C) extracts historic (1947) contemporary (2018) samples collected at Moccasin, MT; Akron, CO; Big Spring, TX; examine changes labile C N optical properties after 71 years of dryland cropping. Concentrations decreased between 1947 2018 surface (0–15.2 cm) by 52% 35%, 37% 32%, remained unchanged Akron. Conversely, net (hot−cool) extractable did not Moccasin or Spring increased Akron 26%. Net 22% elsewhere. Sequential principal component analysis stepwise discriminant identified three important Values SUVA 254 (where specific ultraviolet absorbance nm) indicating aromaticity. Spring. for Sag 350–400 slope a nonlinear fit an exponential function absorption spectrum wavelength range 350 400 nm), inversely related extract molecular weight aromaticity, The proportion recalcitrant compounds, C:T ratio fluorescence intensity Peak [ex340/em440] T [ex275/em340]), all sites especially Together, these methods provided insights into while conserving samples.

Language: Английский

Citations

0
Climate Change: Temperature and Oxygen Impacts on the Photooxidation of Dissolved Organic Carbon (DOC) DOI Creative Commons
Ora E. Johannsson, M. S. Ferreira, Anne Crémazy

et al.

Journal of Photochemistry and Photobiology, Journal Year: 2025, Volume and Issue: unknown, P. 100262 - 100262

Published: May 1, 2025

Language: Английский

Citations

0
Preferential Partitioning of Per- and Polyfluoroalkyl Substances in Freshwater Ice DOI

Summer L. Sherman-Bertinetti,

Kaitlyn J. Gruber,

Christina K. Remucal

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 13, 2024

Millions of lakes worldwide freeze, yet the fate per- and polyfluoroalkyl substances (PFAS) in ice freshwater systems is poorly understood. We quantified concentrations 36 PFAS, dissolved organic carbon (DOC), inorganic ions water seven to investigate preferential exclusion during freezing. PFAS are typically lower than column, demonstrating that these chemicals excluded from as it freezes. However, there partitioning both DOC relative cations with average sodium-normalized enrichment factors (EF) ranging 2.74 for perfluorobutanoate (PFBA; a C4 perfluorocarboxylic acid) 4.01 perfluorooctanesulfonate (PFOS; C8 perfluorosulfonic acid), similar EF value 4.14 DOC. Laboratory experiments seasonal measurements column indicate function aqueous concentrations, values observed waters higher concentrations. Understanding behavior important predicting contaminant winter spring periods, implications exposure release when melts systems.

Language: Английский

Citations

2
Advanced hybridization of coagulation–ultrafiltration systems: A critical techno-economic review of integration strategies DOI
Shashank Srivastava, Chandan Das

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 68, P. 106297 - 106297

Published: Oct. 22, 2024

Language: Английский

Citations

1
Characterization of Natural Organic Matter and Humic Substance Isolates by Size Exclusion Chromatography following Reduction with Sodium Borohydride DOI Creative Commons
Hang Li,

Blair Hanson,

Garrett McKay

et al.

ACS Environmental Au, Journal Year: 2024, Volume and Issue: 5(2), P. 197 - 210

Published: Dec. 20, 2024

Chemical reduction with sodium borohydride has been used for over four decades to probe the presence and function of carbonyl-containing moieties in dissolved organic matter (DOM). One these structure–property relationships is attenuation UV–visible absorbance after reduction, an effect that observed universally across DOM different origins. We previously demonstrated similar bulk physicochemical properties exhibits bifurcating reactivity depending on source (i.e., soil vs. aquatic), as judged by kinetics fractional removal during at a fixed borohydride:DOM mass ratio. This result data from other studies suggest portion borohydride-reducible chromophores may be inaccessible water solvent, explaining incomplete even very high excesses. Here, we study five isolates via size exclusion chromatography coupled total carbon, absorbance, fluorescence detectors. Reduction resulted quantifiable yet exceedingly small decreases molecular weight, suggesting carbonyl groups alcohols does not markedly impact secondary structure. Interestingly, higher weight exhibited most prominent changes optical larger molecules contain proportion moieties. Optical surrogates were inversely correlated single isolate, both native reduced. However, correlation broke down lower weights, wherein remained constant continued elution volume, there intrinsic limit ability capture further weight. Overall, results provide insights into structure help inform future applications studying reactivity.

Language: Английский

Citations

0