Colloidal Properties of Submicron Particles in Natural Waters

Filella, Montserrat

doi:10.1002/9780470024539.ch2

Cited by 57 publications

(50 citation statements)

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“…The intrinsic hydrophobicity of SWNTs has been reported as a major obstacle for biological and other aqueous applications. Difficulty obtaining a stable suspension is also a major problem for aquatic toxicity studies because the exposure to the nanoparticle suspension is constantly changing due to aggregation, agglomeration, and sedimentation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Acute toxicity of a mixture of copper and single‐walled carbon nanotubes to Daphnia magna

Kim

Klaine

Lin

et al. 2009

Enviro Toxic and Chemistry

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Nanomaterials released into the environment will interact with many materials including other contaminants. This may influence bioavailability and fate of both the nanoparticles and the other contaminants. The present study examined the effect of a combination of soluble copper and surface-modified single-walled carbon nanotubes (SWNTs) on Daphnia magna. Lysophosphatidylcholine (LPC) was used to modify the surface of SWNTs, reducing the surface hydrophobicity of the tubes and thereby producing a stable aqueous nanoparticle suspension. The toxicity of the nanoparticle-copper (Cu) mixture was determined to be additive. The addition of nontoxic concentration of LPC-SWNTs enhanced the uptake and toxicity of copper. Greater amounts of Cu were shown to accumulate in D. magna upon addition of 0.5 and 1.0 mg/L LPC-SWNTs.

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Section: Introductionmentioning

confidence: 99%

Acute toxicity of a mixture of copper and single‐walled carbon nanotubes to Daphnia magna

Kim

Klaine

Lin

et al. 2009

Enviro Toxic and Chemistry

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“…This approach is conceptually appealing but faces some fundamental problems: (i) it is not possible to know "all" the components of any natural water; (ii) the approach is based on the idea that complexing agents such as natural organic matter and mineral particles do not interact among themselves, which is far from reality [50]; (iii) the description of metal complexation by natural organic matter and, to a lesser extent, by mineral particles has proved difficult and controversial [51][52][53][54]; (iv) the control by kinetics is not considered. Thus, this approach, although useful, will never produce the "final" answer (like all of the other approaches!).…”

Section: Chemical Speciationmentioning

confidence: 99%

Food for Thought: A Critical Overview of Current Practical and Conceptual Challenges in Trace Element Analysis in Natural Waters

Filella

2013

Water

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Abstract:The practical and conceptual challenges faced by the analysis of trace elements present in natural waters are not merely, as is often thought, an endless race towards lower detection limits or to the development of techniques allowing the determination of any possible chemical species formed by all chemical elements. Rather, as discussed in this paper, they include the development of (i) robust, cheap, and reliable methods that could also be used by laypeople (the experience gained in the development of field kits for As is discussed as an example from which similar developments for other elements may be drawn); (ii) more environmentally-friendly methods (the current guiding criteria probably being too simplistic); and (iii) methods making it possible to follow diel concentration changes and sharp concentration variations caused by the probable increase of heavy rainfall events. This paper also claims that neither the measurement of total concentrations (reliable methods are lacking for many elements of the periodic table of trace elements, as illustrated through the cases of Bi, Te, and Sb), nor chemical speciation analysis, are as mature as often thought. In particular, chemical speciation studies demand the development of a better, comprehensive conceptual framework. A trial is carried out to lay the basis of such a framework.

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“…[1][2][3] DOM is a complex mixture of ill-defined components exhibiting high heterogeneity in size and chemical composition. [2,4,5] This complexity makes the quantitative understanding and prediction of DOM reactivity with respect to metal uptake, as well as the environment in general, a challenging task. Studying the role of DOM in the environment is approached by three different methods: direct measurement of the parameters of interest without separation, measurement after fractionation, or through the isolation and investigation of the properties of a homologous groups of compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Studying the role of DOM in the environment is approached by three different methods: direct measurement of the parameters of interest without separation, measurement after fractionation, or through the isolation and investigation of the properties of a homologous groups of compounds. [2,5] Up to now, most of the mechanistic knowledge concerning the role of DOM in metal speciation and uptake has been obtained from laboratory experiments with isolated fractions of homologous groups of compounds, such as humic substances.…”

Section: Introductionmentioning

confidence: 99%

Pb uptake by the freshwater alga Chlorella kesslerii in the presence of dissolved organic matter of variable composition

Lamelas¹

2008

Environ. Chem.

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Environmental context. Dissolved organic matter (DOM) is of utmost importance for a toxic metal's fate and ecotoxicity in the aquatic system, but the complex nature and variable composition of DOM makes the quantitative understanding of DOM's role in the environment very difficult. We have demonstrated that the assumption that the properties of a DOM mixture are the sum of the properties of its individual fractions can capture the main trends characterising the role of DOM in lead speciation and adsorption by freshwater microalgae. This was done by mixing the isolated, well-characterised fractions of DOM and measuring levels of free lead ion and Pb adsorbed and internalised by algae.Abstract. Dissolved organic matter (DOM) is a complex mixture of ill-defined components, which makes the quantitative understanding of DOM functions in aquatic systems a challenging task. The traditional approach for studying such complex mixtures involves their separation into groups of different components, while assuming minimal or no alteration of their properties. By mixing the pre-isolated and well-characterised individual fractions of the DOM, including humic, fulvic and alginic acids, we have demonstrated that the free Pb ion concentrations and the adsorbed Pb plus Pb internalised by the alga Chlorella kesslerii in the presence of DOM samples of different compositions can be predicted on the basis of the experiments performed in the presence of the individual DOM fractions. An additivity model assuming that the properties of the mixture can be considered as the sum of the properties of the individual components captured the Pb speciation and adsorption behaviour in the presence of DOM of variable compositions. Similarly to the results with the individual DOM fractions, internalised Pb concentrations in the presence of the reconstituted DOM were greater than that predicted by the corresponding free lead ion concentration. An improved fit between experimental observations and the model predictions of adsorbed plus internalised Pb in the presence of DOM of different compositions was observed by assuming that each individual component adsorbed by the algae gave access to additional binding sites for Pb. Furthermore, the contribution of the Pb-DOM complex to total cellular Pb was dominated by the humic and fulvic acids, whereas the contribution of alginate was minimal.

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Colloidal Properties of Submicron Particles in Natural Waters

Cited by 57 publications

References 0 publications

Acute toxicity of a mixture of copper and single‐walled carbon nanotubes to Daphnia magna

Acute toxicity of a mixture of copper and single‐walled carbon nanotubes to Daphnia magna

Food for Thought: A Critical Overview of Current Practical and Conceptual Challenges in Trace Element Analysis in Natural Waters

Pb uptake by the freshwater alga Chlorella kesslerii in the presence of dissolved organic matter of variable composition

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