The role of charged polymer coatings of nanoparticles on the speciation and fate of metal ions in the environment

Domingos, Rute F.; Franco, Catarina; Pinheiro, José Paulo

doi:10.1007/s11356-014-3546-8

Cited by 16 publications

(11 citation statements)

References 26 publications

(26 reference statements)

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“…There are several examples of SCP and SSCP studies to elucidate the speciation of 173 metal ions in presence of nanoparticles and/or to study the dissolution of the 174 nanoparticles. For instance, SSCP was used to investigate the structural effects on 175 Cd(II) binding to multi-responsive carboxylated PNIPAM particles (temperature, pH, 176 ionic strength) [94], the role of charged polymer coatings of nanoparticles on the trace 177 metal speciation [95], the impact of electrostatics on the binding of Pb(II) and Cd(II) 178 with highly charged nanoparticles [96] and the dissolution of Cd-based quantum dots in 179 seawater [97]. 180…”

Section: Scp/sscp (Scanned Stripping Chronopotentiometry)mentioning

confidence: 99%

A review on electrochemical methods for trace metal speciation in environmental media

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Galceran

Pinheiro

et al. 2017

Current Opinion in Electrochemistry

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11Trace metal speciation is key to understand/predict bioavailability and potential toxicity 12 of metals to biota and will, undoubtedly, be incorporated in future regulations. 13Electroanalytical methods have a role to play in such development: they offer a wide 14 range of advantages such as speed, portability, economy, solid interpretation 15 backgrounds and low limits of quantification. This review focusses on three selected 16 stripping techniques: Competitive-Ligand Exchange -Cathodic Stripping Voltammetry 17 (CLE-CSV), Scanned Stripping Chrono-Potentiometry (SSCP) and AGNES (Absence 18 of Gradients and Nernstian Equilibrium Stripping) reporting their working principles, 19 characteristics (strong and weak points) and recent applications to systems of 20 environmental relevance (such as seawaters, freshwaters or soil extracts). 21 22 23 24 Keywords: speciation, availability, electroanalysis, electrochemistry, heavy metal, 25 CLE-CSV, SSCP, AGNES 26 27 published in Current Opinion 3 (2017) 144-162 33 Speciation (i.e. the distribution of an element among its different chemical forms[1]) 34 has been recognised as a key factor for trace metal (bio)availability to biota, as 35 postulated by hegemonic ecotoxicological paradigms such as the Free Ion Activity 36 Model (FIAM) [2] or the Biotic Ligand Model (BLM)[3], both assuming that the free 37 ion is the only bioavailable species. The limits of these models have recently been 38 reviewed [4], highlighting numerous cases where specific fractions of metal complexes 39 can be internalized, either directly or through the dissociation of labile complexes. Thus, 40there is a need to design, develop, apply and interpret analytical techniques able to 41 provide reliable speciation information [5][6][7] that can be used by regulatory bodies. 42Although there are numerous non-electrochemical techniques [5][6][7][8][9][10][11][12][13], those that are 43 provide attractive possibilities such as speed of analysis, low-cost and miniaturization in 44 view to on-site (and in-situ) measurements [14], and can also provide thermodynamic 45 (i.e. equilibrium) information (such as the amount of the free metal, the amount of 46 complexing sites, the stoichiometry of complexes and their stability constants [15]) as 47 [16;17]. Stripping techniques, due to their low detection limits, are well suited for 50 environmental analysis. They are two-stage techniques, where the first stage is a 51 deposition step that accumulates the analyte (at the electrode surface or in its volume), 52 followed by a second stage that quantifies this analyte. Anodic Stripping Voltammetry 53 (ASV), in its multiple variants, is the most popular and has the advantage to possibly be 54 measuring a potentially bioavailable fraction of the metal, as shown again recently 55 [18;19]. 56 57 published in Current Opinion 3 (2017) 144-162 This critical evaluation focusses on three techniques that are known powerful tools for 58 metal speciation: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) 59 and SSCP...

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Section: Scp/sscp (Scanned Stripping Chronopotentiometry)mentioning

confidence: 99%

A review on electrochemical methods for trace metal speciation in environmental media

Companys

Galceran

Pinheiro

et al. 2017

Current Opinion in Electrochemistry

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“…Em 2015, Domingos et al 100 estudaram a influência das camadas poliméricas de policarboxilatos que recobrem nanopartículas de CdTe/CdS na estabilização da nanopartícula e na interação com outros cátions metálicos presentes no meio ambiente. Os experimentos usando SSCP mostraram que apesar da solubilidade das nanopartículas ser maior a pH 8,5 do que a pH 6,0, a quantidade de Cd(II) livre em solução era muito menor, pois este está complexado na camada polimérica, e que em presença de Pb(II), este podia tanto ser complexado pela camada, como trocar com o Cd(II) e formar PbS na superficie da partícula.…”

Section: Exemplos De Estudos De Especiação Dinâmica Em Sistemas Modelunclassified

Especiação Dinâmica De Metais Traço Em Ambiente Aquático Usando Cronopotenciometria De Redissolução Anódica

Monteiro¹,

Goveia²,

Rotureau³

et al. 2018

Quim. Nova

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Recebido em 26/01/2018; aceito em 12/04/2018; publicado na web em 22/05/2018 DYNAMIC SPECIATION OF TRACE METALS IN AQUATIC ENVIRONMENT USING ANODIC STRIPPING CHRONOPOTENTIOMETRY. The contamination of natural environments by trace metals has several adverse effects on human health, which is mainly due to the high toxicity, persistence and reactivity of these species in the environment. To understand the bioavailability of trace metals, it is necessary to know the speciation in equilibrium and the dynamic behavior of the system. In this context, the present work aims to present a bibliographic review about the potentialities of the Stripping Chronopotentiometry (SCP) and Stripping Chronopotentiometry at Scanned Deposition Potential (SSCP) in the study of dynamic trace metal speciation. These techniques have low detection limits and do not suffer interference due to the adsorption of organic matter on the surface of the working electrode. Coupling these techniques with the Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) enables simultaneous determination of free ions, complexation equilibrium constants and diffusion coefficients of the complexes, thus providing information on the dynamic and heterogeneity of the metal complexes in the presence of macromolecules or particles. In this paper we will present the theory of dynamic speciation of trace metals, a detailed description of how to use the techniques to obtain this information, and examples of application in model systems and natural samples.Keywords: metal complexes; metal ions; lability; redissolution techniques; deposition time. INTRODUÇÃOO interesse no estudo de metais traço em solução provém da elevada toxicidade, persistência e reatividade de muitos destes no ambiente. Em ambientes aquáticos naturais, os íons metálicos podem se distribuir em diferentes espécies como resultado das interações com componentes da matriz (matéria orgânica, partículas inorgâni-cas) e das características físico-químicas (temperatura, força iônica, pH, potencial redox, presença de outros íons) do meio. A maioria das espécies formadas tem caráter polifuncional e polieletrolítico, apresentando ampla faixa de constantes de velocidade de formação/ dissociação e de tamanhos, que controlam a biodisponibilidade, toxicidade e mobilidade dos íons metálicos. 1O estudo da distribuição dessas espécies é denominado de especiação de metais. O termo especiação foi definido como a descrição da abundância de um elemento numa amostra (distribuição da espé-cie), enquanto a análise de especiação se refere aos procedimentos analíticos de identificação e/ou medida quantitativa de uma ou mais espécies químicas numa amostra. Cada uma destas espécies pode se comportar de forma diferente em termos de mobilidade e biodisponibilidade em sistemas aquáticos naturais, portanto, estão sujeitas à mudança de condições e praticamente nunca atingem o equilíbrio químico. Isto torna o estudo da especiação muito mais complicado, uma vez que se faz necessária uma compreensão da cinética das reações do ...

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“…via dynamic speciation) 162,163 or morphology. 37 Some of these changes may be reversible, 159,164 whilst other processes may give rise to irreversible transformations or “aging” 165 (“ageing”).…”

Section: Key Challengesmentioning

confidence: 99%

How should the completeness and quality of curated nanomaterial data be evaluated?

et al. 2016

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Nanotechnology is of increasing significance. Curation of nanomaterial data into electronic databases offers opportunities to better understand and predict nanomaterials’ behaviour. This supports innovation in, and regulation of, nanotechnology. It is commonly understood that curated data need to be sufficiently complete and of sufficient quality to serve their intended purpose. However, assessing data completeness and quality is non-trivial in general and is arguably especially difficult in the nanoscience area, given its highly multidisciplinary nature. The current article, part of the Nanomaterial Data Curation Initiative series, addresses how to assess the completeness and quality of (curated) nanomaterial data. In order to address this key challenge, a variety of related issues are discussed: the meaning and importance of data completeness and quality, existing approaches to their assessment and the key challenges associated with evaluating the completeness and quality of curated nanomaterial data. Considerations which are specific to the nanoscience area and lessons which can be learned from other relevant scientific disciplines are considered. Hence, the scope of this discussion ranges from physicochemical characterisation requirements for nanomaterials and interference of nanomaterials with nanotoxicology assays to broader issues such as minimum information checklists, toxicology data quality schemes and computational approaches that facilitate evaluation of the completeness and quality of (curated) data. This discussion is informed by a literature review and a survey of key nanomaterial data curation stakeholders. Finally, drawing upon this discussion, recommendations are presented concerning the central question: how should the completeness and quality of curated nanomaterial data be evaluated?

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The role of charged polymer coatings of nanoparticles on the speciation and fate of metal ions in the environment

Cited by 16 publications

References 26 publications

A review on electrochemical methods for trace metal speciation in environmental media

A review on electrochemical methods for trace metal speciation in environmental media

Especiação Dinâmica De Metais Traço Em Ambiente Aquático Usando Cronopotenciometria De Redissolução Anódica

How should the completeness and quality of curated nanomaterial data be evaluated?

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