Does natural organic matter increase the bioavailability of cerium dioxide nanoparticles to fish?

2015 ◽  
Vol 12 (6) ◽  
pp. 673 ◽  
Author(s):  
Rhys M. Goodhead ◽  
Blair D. Johnston ◽  
Paula A. Cole ◽  
Mohammed Baalousha ◽  
David Hodgson ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Cerium Dioxide ◽  
Natural Waters ◽  
Biological Effects ◽  
Fulvic Acids ◽  
Consumer Products ◽  
Ceo2 Nanoparticles ◽  
Aggregation Behaviour ◽  
Analytical Approaches

Environmental context Nanoparticles are present in growing volumes of consumer products and are suspected to be released into the environment at detectable levels. We focus on cerium dioxide nanoparticles and investigate their availability to fish from the water column, where we found increasing concentrations of natural organic material increased the ceria measured in the fish gills. This complex interaction between nanoparticle behaviour and uptake from environmentally relevant test systems is significantly understudied. Abstract Natural organic colloids affect the fate and behaviour of nanoparticles in the aquatic environment but how these interactions affect the bioavailability of nanoparticles to organisms is a major knowledge gap in risk-assessment analysis. Here, we investigated interactions of citrate-coated cerium dioxide (CeO2) nanoparticles with fulvic acids, representing natural organic matter, and assessed their bioavailability to fish (common carp, Cyprinus carpio) exposed chronically (32days) via the water. We show a fulvic acid concentration-related enhancement in the uptake of cerium (Ce) into gill tissues, with some evidence for an enhanced Ce uptake also into kidney and brain tissues in the presence of fulvic acids, but with more variable responses. We present evidence for differences in the aggregation behaviour for CeO2 nanoparticles in the different exposure scenarios, with reduced CeO2 particle aggregate size with citrate coating and fulvic acids, as determined from dynamic light scattering. We highlight that multiple analytical approaches are essential for understanding the dynamic nature of the particles and also that interpretations on measured particle sizes and characteristics may differ depending on the technique(s) employed. We conclude that conditions in natural waters are likely to play a fundamental role in affecting bioavailability and thus potential biological effects of CeO2 particles.

Silver nanoparticle removal from drinking water: flocculation/sedimentation or filtration?

2013 ◽  
Vol 13 (5) ◽  
pp. 1181-1187 ◽  
Author(s):  
Desmond F. Lawler ◽  
Anne M. Mikelonis ◽  
Ijung Kim ◽  
Boris L. T. Lau ◽  
Sungmin Youn
Keyword(s):  
Silver Nanoparticles ◽  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Conventional Treatment ◽  
Granular Media ◽  
Natural Waters ◽  
Consumer Products ◽  
Treatment Processes ◽  
Water Treatment Plants

Silver nanoparticles are used in a wide variety of consumer products and are therefore rapidly becoming ubiquitous in the natural environment; they can be expected to be found in the natural waters used as drinking water supplies. This research investigated whether such particles could be expected to be removed in conventional water treatment plants such as flocculation and filtration. Both flocculation and granular media filtration experiments with citrate-capped silver nanoparticles were performed at different ionic strengths and in the presence and absence of natural organic matter. The results were generally consistent with theories of particle destabilization that have been developed for larger particles (greater than 1 μm), suggesting that silver nanoparticles are likely to be removed in conventional treatment processes.

scholarly journals Stability of Fe-oxide nanoparticles coated with natural organic matter under relevant environmental conditions

2014 ◽  
Vol 70 (12) ◽  
pp. 2040-2046 ◽  
Author(s):  
L. Chekli ◽  
S. Phuntsho ◽  
L. D. Tijing ◽  
J. L. Zhou ◽  
J.-H. Kim ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Environmental Conditions ◽  
Divalent Cations ◽  
Oxide Nanoparticles ◽  
Fe Oxide ◽  
Coated Nanoparticles ◽  
Aggregation Behaviour ◽  
Physico Chemical ◽  
The Stability

Manufactured nanoparticles (MNPs) are increasingly released into the environment and thus research on their fate and behaviour in complex environmental samples is urgently needed. The fate of MNPs in the aquatic environment will mainly depend on the physico-chemical characteristics of the medium. The presence and concentration of natural organic matter (NOM) will play a significant role on the stability of MNPs by either decreasing or exacerbating the aggregation phenomenon. In this study, we firstly investigated the effect of NOM concentration on the aggregation behaviour of manufactured Fe-oxide nanoparticles. Then, the stability of the coated nanoparticles was assessed under relevant environmental conditions. Flow field-flow fractionation, an emerging method which is gaining popularity in the field of nanotechnology, has been employed and results have been compared to another size-measurement technique to provide increased confidence in the outcomes. Results showed enhanced stability when the nanoparticles are coated with NOM, which was due to electrosteric stabilisation. However, the presence of divalent cations, even at low concentration (i.e. less than 1 mM) was found to induce aggregation of NOM-coated nanoparticles via bridging mechanisms between NOM and Ca2+.

Tailoring activated carbons for enhanced removal of natural organic matter from natural waters

Carbon ◽  
2004 ◽  
Vol 42 (3) ◽  
pp. 547-557 ◽  
Author(s):  
Seyed A Dastgheib ◽  
Tanju Karanfil ◽  
Wei Cheng
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Natural Waters ◽  
Activated Carbons

Influence of natural organic matter on the morphology of corroding copper surface

1994 ◽  
Vol 52 ◽  
pp. 678-679
Author(s):  
G. V. Korshin ◽  
J. F. Ferguson ◽  
M. E. Rock
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Natural Waters ◽  
Copper Surface ◽  
Metal Corrosion ◽  
Localized Corrosion ◽  
Corrosion Attack ◽  
Copper Surfaces ◽  
Mineralized Water ◽  
Polymeric Species

Natural organic matter (NOM) is a ubiquitous and important component of natural waters. Polymeric species related to humus found in soils constitute the major part of NOM. NOM is of major importance for the speciation of metals in waters but its effects on metal corrosion are little known. The influence of NOM on the morphology of corroding copper surfaces is discussed in this communication. The studies were performed for copper coupons exposed for 7 weeks to waters supporting an intense localized corrosion attack called pitting. Two types of waters were used: highly mineralized water at pH close to 7.3 (water A) and soft water at pH close to 9.3 (water B). The morphology of the surface was examined using conventional photography and SEM (JEOL 5200). The range of accelerating voltages was from 10 to 25 kV.Profound effects of NOM on the state of the corroding copper surface were found.

Adsorptive fouling of a polypropylene microfiltration membrane with dissolved natural organic matter: do membranes possess an adsorption capacity?

2006 ◽  
Vol 6 (2) ◽  
pp. 25-30 ◽  
Author(s):  
M. Koh ◽  
M.M. Clark ◽  
K.P. Ishida
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Natural Waters ◽  
Uv Light ◽  
Attenuated Total Reflectance ◽  
Infrared Spectrometry ◽  
Flux Decline ◽  
Aromatic Ether

Rejection by membrane adsorption has been observed and widely reported. However, little is known about whether membranes possess an adsorption capacity. Experimental data showed that when a hydrophobic polypropylene (PP) microfilter was used to filter a large volume of particle-free surface water containing dissolved natural organic matter (NOM), later batches of microfiltration (MF) permeate caused more flux decline to a fresh 20K-Dalton polyethersulfone (PES) ultrafilter. This suggests that membranes can have an adsorption capacity for foulants. In this research, the gradual increase in absorbance of ultraviolet (UV) light by subsequent batches of MF permeate was observed, and supports the findings from previous studies, that only a small fraction of NOM causes membrane fouling. Attenuated total reflectance Fourier transform infrared spectrometry and energy dispersive spectroscopy of fouled PP and PES membranes suggests foulants containing amide, aromatic, ether, hydroxyl and silicate functional groups. Silicates appear to participate in membrane fouling, and its removal with the small fraction of fouling NOM can reduce the fouling potential of water. These data improve our understanding of membrane fouling by natural waters, and have implications for the design of membrane plants that filter natural waters.

Effect of natural organic matter on cerium dioxide nanoparticles settling in model fresh water

Chemosphere ◽  
2010 ◽  
Vol 81 (6) ◽  
pp. 711-715 ◽  
Author(s):  
Joris T.K. Quik ◽  
Iseult Lynch ◽  
Karen Van Hoecke ◽  
Cornelis J.H. Miermans ◽  
Karel A.C. De Schamphelaere ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fresh Water ◽  
Natural Organic Matter ◽  
Cerium Dioxide

Biofilm control in water by advanced oxidation process (AOP) pre-treatment: effect of natural organic matter (NOM)

2011 ◽  
Vol 64 (9) ◽  
pp. 1876-1884 ◽  
Author(s):  
Anat Lakretz ◽  
Eliora Z. Ron ◽  
Tali Harif ◽  
Hadas Mamane
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Biofilm Formation ◽  
Natural Waters ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Post Treatment ◽  
Control Effect ◽  
Biofilm Control

The main goal of this study was to examine the influence of natural organic matter (NOM) on the efficiency of H2O2/UV advanced oxidation process (AOP) as a preventive treatment for biofilm control. Pseudomonas aeruginosa PAO1 biofilm-forming bacteria were suspended in water and exposed to various AOP conditions with different NOM concentrations, and compared to natural waters. H2O2/UV prevented biofilm formation: (a) up to 24 h post treatment – when residual H2O2 was neutralized; (b) completely (days) – when residual H2O2 was maintained. At high NOM concentrations (i.e. 25 mg/L NOM or 12.5 mg/L DOC) an additive biofilm control effect was observed for the combined H2O2/UV system compared to UV irradiation alone, after short biofilm incubation times (<24 h). This effect was H2O2 concentration dependent and can be explained by the high organic content of these water samples, whereby an increase in NOM could enhance •OH production and promote the formation of additional reactive oxygen species. In addition, maintaining an appropriate ratio of bacterial surviving conc.: residual H2O2conc. post-treatment could prevent bacterial regrowth and biofilm formation.

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