Particulate organic carbon in Atlantic surface waters

Nature ◽  
1977 ◽  
Vol 266 (5604) ◽  
pp. 713-716 ◽  
Author(s):  
S. KRISHNASWAMI ◽  
D. LAL
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Surface Waters

scholarly journals Spatial patterns and environmental controls of particulate organic carbon in surface waters in the conterminous United States

2016 ◽  
Vol 554-555 ◽  
pp. 266-275 ◽  
Author(s):  
Qichun Yang ◽  
Xuesong Zhang ◽  
Xingya Xu ◽  
Ghassem R. Asrar ◽  
Richard A. Smith ◽  
...  
Keyword(s):  
United States ◽  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Spatial Patterns ◽  
Surface Waters ◽  
Environmental Controls

Insights into natural organic matter and pesticide characterisation and distribution in the Rhone River

2017 ◽  
Vol 14 (1) ◽  
pp. 64 ◽  
Author(s):  
Danielle L. Slomberg ◽  
Patrick Ollivier ◽  
Olivier Radakovitch ◽  
Nicole Baran ◽  
Nicole Sani-Kast ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Natural Organic Matter ◽  
Surface Waters ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Rhône River ◽  
Allochthonous Species ◽  
Rhone River

Environmental contextNatural organic matter in surface waters is a transport vector for environmental pollutants with both its concentration and composition influencing pollutant fate. Characterisation of organic matter in surface waters, crucial to understanding pollutant transport, should also account for spatial variation along the water source. The present work characterises the natural organic matter in the Rhone River and describes the distributions of various pesticides and metabolites along the river. AbstractThorough characterisation of natural organic matter (NOM) in natural surface waters remains vital for evaluating pollutant dynamics and interactions with NOM under realistic environmental conditions. Here, we present the characterisation of NOM and pesticide compositions for nine sampling sites over the length of the Rhone River, also evaluating the advantages and limitations of different analytical techniques to determine how they complement one another. Together with dissolved and particulate organic carbon analyses, the dissolved organic matter (DOM, <0.8μm) or NOM (unfiltered organic matter) was characterised with gel permeation chromatography, the polarity rapid-assessment method, excitation–emission matrix fluorescence, and pyrolysis–gas chromatography–mass spectrometry to evaluate both composition and distribution. An additional objective was the determination of the NOM degradation state (i.e. constantly produced autochthonous or weakly degraded allochthonous species), an important factor in assessing potential NOM–pollutant interactions. The NOM compositions (i.e. proteins, polyhydroxy aromatics, polysaccharides, amino sugars) and proportions were similar between sites, but variations were observed in the relative proportions of autochthonous and allochthonous material from north to south. Anionic proteins and polyhydroxy aromatics in a molecular weight range of ~1000–1200 Da comprised the majority of the DOM. As a pollutant case study, five pesticides (glyphosate, metalochlor, chlortoluron, isoproturon, propyzamide) and some of their metabolites (aminomethylphosphonic acid, metolachlor ethanesulfonic acid and metolachlor oxanilic acid) were measured. Several exhibited trends with the NOM, particulate organic carbon and suspended particulate matter distributions in the Rhone waters, suggesting a significant influence on pesticide fate and transport in the river.

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