Characterization and biogeochemical implications of dissolved organic matter in aquatic environments

2021 ◽  
Vol 294 ◽  
pp. 113041
Author(s):  
Hengfeng Zhang ◽  
Yucong Zheng ◽  
Xiaochang C. Wang ◽  
Yongkun Wang ◽  
Mawuli Dzakpasu
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Environments

Measurement of Dissolved Organic Matter Fluorescence in Aquatic Environments: An Interlaboratory Comparison

2010 ◽  
Vol 44 (24) ◽  
pp. 9405-9412 ◽  
Author(s):  
Kathleen R. Murphy ◽  
Kenna D. Butler ◽  
Robert G. M. Spencer ◽  
Colin A. Stedmon ◽  
Jennifer R. Boehme ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Interlaboratory Comparison ◽  
Aquatic Environments

scholarly journals A network perspective reveals decreasing material diversity in studies on nanoparticle interactions with dissolved organic matter

2017 ◽  
Vol 114 (10) ◽  
pp. E1756-E1765 ◽  
Author(s):  
Nicole Sani-Kast ◽  
Jérôme Labille ◽  
Patrick Ollivier ◽  
Danielle Slomberg ◽  
Konrad Hungerbühler ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Engineered Nanoparticles ◽  
Experimental Results ◽  
Aquatic Environments ◽  
Particle Coating ◽  
Nanoparticle Interactions ◽  
Aliphatic Carbon ◽  
Extensive Body ◽  
Micrometer Scale

Dissolved organic matter (DOM) strongly influences the properties and fate of engineered nanoparticles (ENPs) in aquatic environments. There is an extensive body of experiments on interactions between DOM and ENPs and also larger particles. [We denote particles on the nano- and micrometer scale as particulate matter (PM).] However, the experimental results are very heterogeneous, and a general mechanistic understanding of DOM–PM interactions is still missing. In this situation, recent reviews have called to expand the range of DOM and ENPs studied. Therefore, our work focuses on the diversity of the DOM and PM types investigated. Because the experimental results reported in the literature are highly disparate and difficult to structure, a new format of organizing, visualizing, and interpreting the results is needed. To this end, we perform a network analysis of 951 experimental results on DOM–PM interactions, which enabled us to analyze and quantify the diversity of the materials investigated. The diversity of the DOM–PM combinations studied has mostly been decreasing over the last 25 y, which is driven by an increasing focus on several frequently investigated materials, such as DOM isolated from fresh water, DOM in whole-water samples, and TiO2and silver PM. Furthermore, there is an underrepresentation of studies into the effect of particle coating on PM–DOM interactions. Finally, it is of great importance that the properties of DOM used in experiments with PM, in particular the molecular weight and the content of aromatic and aliphatic carbon, are reported more comprehensively and systematically.

Dissolved organic matter dominating the photodegradation of free DNA bases in aquatic environments

2020 ◽  
Vol 179 ◽  
pp. 115885 ◽  
Author(s):  
Jing Li ◽  
Xin Zhang ◽  
Wen-Yuan Fan ◽  
Mu-Cen Yao ◽  
Guo-Ping Sheng
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Dna Bases ◽  
Aquatic Environments ◽  
Free Dna

Influence of land use and land cover on the spatial variability of dissolved organic matter in multiple aquatic environments

2017 ◽  
Vol 24 (16) ◽  
pp. 14124-14141 ◽  
Author(s):  
Shatrughan Singh ◽  
Padmanava Dash ◽  
Saurav Silwal ◽  
Gary Feng ◽  
Ardeshir Adeli ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Land Cover ◽  
Dissolved Organic Matter ◽  
Spatial Variability ◽  
Aquatic Environments

scholarly journals Microplastics Contamination versus Inorganic Particles: Effects on the Dynamics of Marine Dissolved Organic Matter

Environments ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 21
Author(s):  
Amedeo Boldrini ◽  
Luisa Galgani ◽  
Marco Consumi ◽  
Steven Arthur Loiselle
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Potential Role ◽  
Chromophoric Dissolved Organic Matter ◽  
Aquatic Environments ◽  
Similar Magnitude ◽  
Inorganic Particles ◽  
Marine Organic Matter ◽  
Organic Matter Dynamics ◽  
Free Environment

Microplastic contamination has been linked to a range of impacts on aquatic environments. One important area that is only beginning to be addressed is the effect of microplastics on marine carbon cycling and how these compare to the effects related to inorganic particles typically present in ocean waters. The present study explores these impacts on dissolved organic matter dynamics by comparing three scenarios: a particle-free environment, a particle-enriched system with polystyrene microplastics, and a particle-enriched system with inorganic particles (water insoluble SiO2). Natural marine organic matter was obtained by culturing a non-axenic strain of Chaetoceros socialis in 2 L flasks under each of three scenarios. Following the diatom growth phase, filtered samples from the three flasks containing dissolved organic matter and bacteria were incubated separately in the dark for 5 days to monitor changes in dissolved organic matter. Chromophoric dissolved organic matter (CDOM), a bulk optical property, was monitored daily to examine changes in its quality and quantity and to compare degradation dynamics in the three systems. CDOM absorbance (quantity) remained higher in the control with respect to particle-enriched systems, suggesting that the presence of particles led to different rates of CDOM production and degradation. Using indicators for CDOM that could be related to microbial activity, results showed a higher CDOM alteration in the particle-enriched systems. These results indicate that microplastics have a potential role in modifying marine organic matter dynamics, on a similar magnitude to that of biogenic inorganic particles. Given their increasing concentrations of marine ecosystems, their role in marine microbial processing of organic matter needs to be better understood.

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