Mechanistic Insight into Multiple Effects of Copper Ion on the Photoreactivity of Dissolved Organic Matter

Journal of Hazardous Materials, Год журнала: 2025, Номер 487, С. 137124 - 137124

Опубликована: Янв. 5, 2025

Язык: Английский

---

Pyrolysis temperature dependent effects of biochar on shifting fluorescence spectrum characteristics of soil dissolved organic matter under warming

The Science of The Total Environment, Год журнала: 2023, Номер 892, С. 164656 - 164656

Опубликована: Июнь 5, 2023

Язык: Английский

---

Identification of next-generation International Humic Substances Society reference materials for advancing the understanding of the role of natural organic matter in the Anthropocene

Aquatic Sciences, Год журнала: 2023, Номер 85(1)

Опубликована: Янв. 1, 2023

Abstract Many challenges remain before we can fully understand the multifaceted role that natural organic matter (NOM) plays in soil and aquatic systems. These despite considerable progress has been made understanding NOM’s properties reactivity using latest analytical techniques. For nearly 4 decades, International Humic Substances Society (IHSS, which is a non-profit scientific society) distributed standard substances adhere to strict isolation protocols reference materials are collected bulk originate from clearly defined sites. NOM samples offer relatively uniform for designing experiments developing new methods. The isolating NOM, humic fulvic acid fractions of utilize well-established preparative scale column chromatography reverse osmosis used by international community study across range disciplines engineered systems, thereby seeding transfer knowledge research fields. Recently, powerful techniques characterize have revealed complexities its composition transcend “microbial” vs. “terrestrial” precursor paradigm. To continue advance Anthropocene epoch, workshop was convened identify potential sites would encompass sources be relevant studying mediating environmental biogeochemical processes. We anticipate expanding portfolio IHSS available will enable this diverse group scientists engineers better globally under influence anthropogenic mediated changes.

Язык: Английский

---

Land use effects on spatiotemporal variations of dissolved organic matter fluorescence and water quality parameters in watersheds, and their interrelationships

Journal of Hydrology, Год журнала: 2024, Номер 631, С. 130840 - 130840

Опубликована: Фев. 5, 2024

Язык: Английский

---

Root exudates enhanced 6:2 FTOH defluorination, altered metabolite profiles and shifted soil microbiome dynamics

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133651 - 133651

Опубликована: Янв. 29, 2024

Язык: Английский

---

Driving factors of colored dissolved organic matter dynamics across a complex urbanized estuary

The Science of The Total Environment, Год журнала: 2024, Номер 921, С. 171083 - 171083

Опубликована: Фев. 20, 2024

The role of estuaries in sourcing and transforming dissolved organic matter - the largest reservoir carbon ocean still presents many unknowns for coastal biogeochemical cycles, is further complicated by increasing human pressures a changing climate. Here, we examined major drivers colored (CDOM) dynamics Long Island Sound (LIS), heavily urbanized estuary National Significance with storied water quality past. A comprehensive new optical dataset, including measurements CDOM absorption fluorescence signatures, was integrated biological hydrological to capture spatiotemporal heterogeneities LIS, its urban-to-rural gradient, dynamic river mouths, blue ecosystems across seasons, following episodic storm events, over five years. Results reveal longitudinal gradients both DOM amount quality. While carbon-rich humic terrigenous dominant riverine-influenced Central Eastern an uncoupling between (aCDOM) (DOC) concentration Western stronger correlation Chlorophyll-a, indicated increased autochthonous production. Closer New York City urban core, aCDOM highly correlated turbidity, consistent wastewater influences. Fluorescence PARAFAC analysis provided strong evidence seasonal processing related summertime photochemical degradation humic-like components shoulder-season microbial processing. Riverine export influenced discharge amount, residence time, wetlands acting as additional sources strongly aromatic matter. These allowed us assess how hydrologic, biological, anthropogenic processes impact and, subsequently, variability trophic status this complex estuary, implications management policy. discussed here are applicable beyond globally face similar forcings.

Язык: Английский

---

Linking Dissolved Organic Matter Composition to Landscape Properties in Wetlands Across the United States of America

Global Biogeochemical Cycles, Год журнала: 2024, Номер 38(5)

Опубликована: Май 1, 2024

Abstract Wetlands are integral to the global carbon cycle, serving as both a source and sink for organic carbon. Their potential storage will likely change in coming decades response higher temperatures variable precipitation patterns. We characterized dissolved (DOC) matter (DOM) composition from 12 different wetland sites across USA spanning gradients climate, landcover, sampling depth, hydroperiod comparison DOM other inland waters. Using absorption spectroscopy, parallel factor analysis modeling, ultra‐high resolution mass we identified differences sourcing processing by geographic site. Wetland was driven primarily landcover where forested contained greater aromatic oxygenated content compared grassland/herbaceous which were more aliphatic enriched N S molecular formulae. Furthermore, surface porewater also influenced properties such soil type, content, precipitation. Surface water relatively weight formulae representing HUP High O/C compounds than porewaters, whose suggests abiotic sulfurization inorganic sulfide. Finally, group of persistent (3,489) present all depths (i.e., signature DOM) that important riverine‐to‐coastal transport. As anthropogenic disturbances continue impact temperate wetlands, this study highlights drivers fundamental understanding how change, thus its role biogeochemical cycling.

Язык: Английский

---

Inferring the Molecular Basis for Dissolved Organic Matter Photochemical and Optical Properties

Environmental Science & Technology, Год журнала: 2024, Номер 58(21), С. 9040 - 9050

Опубликована: Май 14, 2024

Despite the widespread use of photochemical and optical properties to characterize dissolved organic matter (DOM), a significant gap persists in our understanding relationship among these properties. This study infers molecular basis for DOM using comprehensive framework known structural moieties within DOM. Utilizing Suwannee River Fulvic Acid (SRFA) as model DOM, carboxylated aromatics, phenols, quinones were identified dominant contributors absorbance spectra, quinones, aldehydes, ketones major radiative energy pathways. It was estimated that chromophores constitute ∼63% w/w carbon SRFA ∼47% overall SRFA. Notably, estimations indicate pool fluorescent compounds photosensitizing are likely distinct from each other at wavelengths below 400 nm. perspective offers practical tool aid identification probable chemical groups when interpreting data challenges current "black box" thinking. Instead, can be closely by assuming is composed mixture individual compounds.

Язык: Английский

---

Role of Direct and Sensitized Photolysis in the Photomineralization of Dissolved Organic Matter and Model Chromophores to Carbon Dioxide

Environmental Science & Technology, Год журнала: 2024, Номер 58(31), С. 13808 - 13819

Опубликована: Июль 24, 2024

This study addresses the fundamental processes that drive photomineralization of dissolved organic matter (DOM) to carbon dioxide (CO

Язык: Английский

---

Biodegradability of algal-derived dissolved organic matter and its influence on methylmercury uptake by phytoplankton

Water Research, Год журнала: 2023, Номер 242, С. 120175 - 120175

Опубликована: Июнь 6, 2023

Язык: Английский

---