scholarly journals Assessing CeO2 and TiO2 Nanoparticle Concentrations in the Seine River and Its Tributaries Near Paris

2021 ◽  
Vol 8 ◽  
Author(s):  
Karine Phalyvong ◽  
Yann Sivry ◽  
Hélène Pauwels ◽  
Alexandre Gélabert ◽  
Mickaël Tharaud ◽  
...  
Keyword(s):  
Engineered Nanoparticles ◽  
Background Concentration ◽  
Seine River ◽  
Elemental Ratios ◽  
Suspended Particulate ◽  
Icp Ms ◽  
Marne River ◽  
Anthropogenic Contribution ◽  
And Behavior ◽  
Fate And Behavior

Motivation for detecting engineered nanoparticles (ENPs) in the environment comes from a need to understand fate and behavior of these materials in natural matrices. The difficulty lies in the low expected ENP particle number concentration (PNC) and the presence of a large and variable background concentration of natural NPs. We report the PNCs and characteristics of cerium-bearing nanoparticles (Ce-NPs) and titanium-bearing nanoparticles (Ti-NPs) in an aquatic matrix (the Seine River and three of its tributaries) with the use of single particle ICP-MS (spICPMS) and electron microscopy (FEG-SEM). Ce-bearing and Ti-bearing particles were observed in suspended particulate matter collected onto 0.2 μm and 1 kDa filters, using FEG-SEM imaging. At Marnay-sur-Seine, the upstream point, PNCs for Ce-NPs and Ti-NPs were 0.47 ± 0.07 × 106 and 1.35 ± 0.17 × 106 particles as measured by spICPMS. The maximum PNC for both Ce-NPs and Ti-NPs, 1.59 ± 0.10 × 106 particles mL−1 and 5.89 ± 0.10 × 106 particles mL−1, respectively, were found in the Marne River, a major tributary to the Seine. It was shown that downstream of each confluence, an increase in the PNC of the Seine is observed, suggesting a significant contribution of the different tributaries. Mass balance of particles flows and elemental ratios of Ce/La showed that in the Marne and the Oise River, a contribution of natural CeO2 NPs exists. The anthropogenic contribution in TiO2 ENPs for the Marne River was further assessed with Ti/Al, Ti/V, and Ti/Y elemental ratios. Near constant element ratios in the Seine below the Orge River and Paris city suggest neither contribute significantly to Ce or Ti NP concentrations. The study provides further investigation of the strengths and limitations of the application of spICPMS to natural samples and contributes data to the currently highly-limited dataset on natural NP backgrounds in rivers, information that is key to assessing the potential for quantifying the input of ENPs to surface waters. Of the total mass of Ce and Ti, 83 and 90%, respectively, could be detected as particles by spICPMS.

Physical and bacterial processes affecting suspended particulate matter in a tidal river

1998 ◽  
Vol 38 (6) ◽  
pp. 327-335
Author(s):  
Yasunori Kozuki ◽  
Yoshihiko Hosoi ◽  
Hitoshi Murakami ◽  
Katuhiro Kawamoto
Keyword(s):  
Particle Size ◽  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
River Mouth ◽  
Tidal River ◽  
Natural Soil ◽  
Size Change ◽  
Run Off ◽  
Suspended Particulate ◽  
And Behavior

In order to clarify the origin and behavior of suspended particulate matter (SPM) in a tidal river, variation of SPM in a tidal river was investigated with regard to its size and constituents. SPM was separated into three groups according to size. Change of contents of titanium and organic substances of each group of SPM was examined. SPM which was discharged by run-off was transported with decomposition and sedimentation in a tidal river. Concentration of SPM with a particle size greater than 0.45 μm increased due to resuspension in a tidal river. Origin of SPM with a size of less than 0.45 μm at upstream areas was from natural soil and most of such SPM which had been transported settled near a river mouth. It was determined from examination of the CN ratio and the ratio of the number of attached bacteria to free bacteria that SPM with a size greater than 1.0 μm at upstream areas was decomposing intensively. At the downstream areas, SPM with a size of less than 0.45 μm came from the sea. SPM with particle size greater than 1.0 μm consisted of plankton and substances which were decomposed sufficiently while flowing.

Tidally Driven Dispersion of a Deep-Sea Sediment Plume Originating from Seafloor Disturbance in the DISCOL Area (SE-Pacific Ocean)

Geosciences ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 8
Author(s):  
Matthias Baeye ◽  
Kaveh Purkiani ◽  
Henko de de Stigter ◽  
Benjamin Gillard ◽  
Michael Fettweis ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Fine Particles ◽  
Transport Model ◽  
Manganese Nodule ◽  
Background Concentration ◽  
Plume Dispersion ◽  
Suspended Particulate Matter Concentration ◽  
Deep Sea Sediment ◽  
Suspended Particulate ◽  
Tidally Driven

The purpose of the study was to measure in situ the background suspended particulate matter concentration (SPMC) in the DISCOL area (SE Pacific) and its increase due to mechanical mobilization of the seabed. The disturbance experiment imitated future manganese nodule exploitations and was designed to measure the sediment plume generated by such activities. In the direct vicinity of the disturbance, landers equipped with acoustic and optical sensors measured the current velocities and the SPMC. The SPMC at the disturbance was easily up to 10 mg/L and thus about 200 times higher than the background concentration. The downstream sediment plume, measured by the lander, had a SPMC of about 1 mg/L. After tide reversal, the sediment plume was recorded a second time. A sediment transport model reproduced the plume dispersion. After rapid settling of the coarser fraction, a plume of hardly settling fine particles remained in suspension (and no deposition–resuspension cycles). The transport was controlled by the tides and by the vertical velocity component that resulted from bathymetrical differences. The plume may continue to disperse up to 100+ days (up to hundreds of km) depending on the particle size and until background concentration is reached.

scholarly journals Human Induced Pluripotent Stem Cell-Derived Microvesicles Transmit RNAs and Proteins to Recipient Mature Heart Cells Modulating Cell Fate and Behavior

Stem Cells ◽  
2015 ◽  
Vol 33 (9) ◽  
pp. 2748-2761 ◽  
Author(s):  
Sylwia Bobis-Wozowicz ◽  
Katarzyna Kmiotek ◽  
Malgorzata Sekula ◽  
Sylwia Kedracka-Krok ◽  
Elzbieta Kamycka ◽  
...  
Keyword(s):  
Stem Cell ◽  
Cell Fate ◽  
Pluripotent Stem Cell ◽  
Induced Pluripotent Stem Cell ◽  
Heart Cells ◽  
Induced Pluripotent ◽  
And Behavior ◽  
Fate And Behavior

scholarly journals Mutagenicity and genotoxicity of suspended particulate matter in the Seine river estuary

2012 ◽  
Vol 741 (1-2) ◽  
pp. 7-12 ◽  
Author(s):  
Françoise Vincent-Hubert ◽  
Karine Heas-Moisan ◽  
Catherine Munschy ◽  
Jacek Tronczynski
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
River Estuary ◽  
Seine River ◽  
Suspended Particulate

Environmental fate and behavior of silver nanoparticles in natural estuarine systems

2020 ◽  
Vol 88 ◽  
pp. 248-259
Author(s):  
Penghui Li ◽  
Min Su ◽  
Xiaodan Wang ◽  
Xiaoyan Zou ◽  
Xia Sun ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Environmental Fate ◽  
Estuarine Systems ◽  
And Behavior ◽  
Fate And Behavior
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