In situ ATR–FTIR and surface complexation modeling studies on the adsorption of dimethylarsinic acid and p-arsanilic acid on iron-(oxyhydr)oxides

Mitchell, William; Goldberg, Sabine; Al‐Abadleh, Hind A.

doi:10.1016/j.jcis.2011.02.040

Cited by 53 publications

(41 citation statements)

References 48 publications

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“…Mitchel et al studied the adsorption of dimethylarsinic acid and p-arsanilic acid on hematite and goethite. 74 The IR band at 840 cm À1 was used in a triple layer model calculation to construct the adsorption isotherms which was subsequently used to obtain thermodynamic binding constant. Inductively coupled-plasma atomic absorption spectroscopy was used for validation of the ATR-FTIR method.…”

Section: Quantitative Analysisthermodynamics Kinetics and Surface Cov...mentioning

confidence: 99%

ATR-FTIR spectroscopy as a tool to probe surface adsorption on nanoparticles at the liquid–solid interface in environmentally and biologically relevant media

Mudunkotuwa

Minshid

Grassian

2014

Analyst

229

192

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Given the importance of nanoparticle surface composition in nanotoxicology, analytical tools that can probe nanoparticle surfaces in aqueous media are crucial but remain limited. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy is a technique capable of in situ characterization of the liquid-solid interface to probe surface adsorption on nanoparticle surfaces in environmentally and biologically relevant media. Furthermore, given that the interfacial region in these media is dynamic, ATR-FTIR spectroscopy facilitates monitoring these dynamics by interrogating a layer of immobilized nanoparticles coated on the ATR element while changing the overlying aqueous phase. The molecular information acquired from this technique allows for the determination of the adsorption mode, including conformational and structural changes of the coordinating ligand, and can directly measure ligand displacement reactions. Furthermore, in some cases, ATR-FTIR spectroscopy can be used as a quantitative surface analytical tool. In this article, we briefly review the fundamentals of the technique and then provide several examples of using ATR-FTIR spectroscopy to probe nanoparticle surfaces in general with respect to: (i) the adsorption of different environmentally and biologically relevant coordinating ligands; (ii) competitive ligand adsorption and; (iii) the determination of kinetic and thermodynamic parameters. We have also investigated surface adsorption of TiO2 nanoparticles in different biological media typically used for toxicity studies and show that the surface composition of TiO2 nanoparticles depends to a large extent on the composition of the medium due to surface adsorption. This result has important implications for the interpretation of toxicity data as well as inter-comparisons between toxicity studies.

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Section: Quantitative Analysisthermodynamics Kinetics and Surface Cov...mentioning

confidence: 99%

ATR-FTIR spectroscopy as a tool to probe surface adsorption on nanoparticles at the liquid–solid interface in environmentally and biologically relevant media

Mudunkotuwa

Minshid

Grassian

2014

Analyst

229

192

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“…The monodentate complex (As OFe) formation is suggested to be stabilized by resonance between uncomplexed (As O) and (As O − ) moieties in the molecule. Mitchell et al well described ASA adsorption envelope on hematite and goethite using two monodentate inner-sphere surface complexes triple-layer surface complexation model [23]. In addition, Dixit and Hering successfully applied a diffuse double layer surface complexation model using three monodentate complexation reactions to describe arsenate 50 50 sorption onto iron oxide minerals [38].…”

Section: Modeling the Surface Complexation Of Aromatic Arsenicals On mentioning

confidence: 99%

“…Due to their arsenate acid moiety, aromatic arsenicals may also adsorb onto iron and aluminum oxides strongly. Previous studies have reported that ASA strongly bonds to iron (oxyhydr)oxide nanoparticles and investigated this adsorption by in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy [21][22][23]. However, few studies thus far have investigated the adsorption of ROX with pure metal oxides to probe the adsorption mechanism.…”

Section: Introductionmentioning

confidence: 99%

Surface adsorption of organoarsenic roxarsone and arsanilic acid on iron and aluminum oxides

Chen

Huang

2012

Journal of Hazardous Materials

135

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“…Analysis of geothermal waters in pristine wilderness areas of the United States suggest that arsenic remains a concern in many localities, and that discharge of these compounds may be a significant health hazard to downstream communities or geothermal energy personnel (Planer-Friedrich et al, 2007). Arsenic contamination clearly remains an important issue even in developed nations and, ironically, the projected expansion of oil shale extraction and energy alternatives such as geothermal power may increase the risk of exposure (Mitchell et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

DUOX expression in human keratinocytes and bronchial epithelial cells: Influence of vanadate

Hill

Rice

2018

Toxicology in Vitro

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Dual oxygenases (DUOX) 1 and 2, expressed in many animal tissues, participate in host defense at mucosal surfaces and may have important signaling roles through generation of reactive oxygen. Present work addresses their expression in cultured human epidermal keratinocytes and effects of cytokines and metal/metalloid compounds. Both DUOX1 and 2 were expressed at much higher levels after confluence than in the preconfluent state. Maximal DUOX1 mRNA levels were 50 fold those of DUOX2. DUOX1 and 2 were induced ≈3 fold by interleukin 4, but only DUOX1 was induced by interferon gamma (IFNγ). In human bronchial HBE1 cells, by contrast, interleukin 4 induced only DUOX 1, and IFNγ induced only DUOX2. A survey in the keratinocytes of metal/metalloid compounds showed that arsenite, antimonite, chromate, cadmium, copper, lead and vanadate suppressed DUOX1 levels but did not prevent interleukin 4 stimulation. Effects on DUOX2 were less dramatic, except that vanadate potentiated the stimulation by IFNγ up to 7 fold. The results indicate that epithelial cell types of different tissue origins can differ in their cytokine regulation and that epidermal cells can exhibit striking alterations in response due to certain metal/metalloid exposures.

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In situ ATR–FTIR and surface complexation modeling studies on the adsorption of dimethylarsinic acid and p-arsanilic acid on iron-(oxyhydr)oxides

Cited by 53 publications

References 48 publications

ATR-FTIR spectroscopy as a tool to probe surface adsorption on nanoparticles at the liquid–solid interface in environmentally and biologically relevant media

ATR-FTIR spectroscopy as a tool to probe surface adsorption on nanoparticles at the liquid–solid interface in environmentally and biologically relevant media

Surface adsorption of organoarsenic roxarsone and arsanilic acid on iron and aluminum oxides

DUOX expression in human keratinocytes and bronchial epithelial cells: Influence of vanadate

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