Aquatic surface chemistry. Chemical processes at the particle-water interface

Stumm, Werner

doi:10.1016/s0003-2670(00)80325-6

Cited by 73 publications

(66 citation statements)

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“…29 Above pH 8, only CrO 4 2-is stable, and as the pH decreases into the pH region 2-6, the equilibria shifts to dichromate according to the overall equilibrium:…”

Section: A Molecular Structure Of Cr In Aqueous Mediamentioning

confidence: 99%

“…Under hydrated conditions, the surface of an amorphous oxide is covered by a thin water film and its hydroxyl population is subject to pH-dependent equilibria reactions: 3,4,92 with X ) Si, Al, Ti, Mg, Nb, Sn or Zr; H s + and H + represent the surface and solution proton, respectively;…”

Section: Hydrated Crmentioning

confidence: 99%

“…[3][4][5][6] The environmental behavior of Cr is illustrated in Figure 1. Chromium is frequently encountered in minerals and in geochemical deposits, 7 and due to erosion and weathering, chromium becomes a surface species or can be released into the environment.…”

Section: A General Introductionmentioning

confidence: 99%

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Surface Chemistry and Spectroscopy of Chromium in Inorganic Oxides

1996

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“…29 Above pH 8, only CrO 4 2-is stable, and as the pH decreases into the pH region 2-6, the equilibria shifts to dichromate according to the overall equilibrium:…”

Section: A Molecular Structure Of Cr In Aqueous Mediamentioning

confidence: 99%

Section: Hydrated Crmentioning

confidence: 99%

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Surface Chemistry and Spectroscopy of Chromium in Inorganic Oxides

1996

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“…The understanding of the occurrence way of elements in soils is therefore essential for the assessment of soil contamination and to elucidate the role that each fraction plays in controlling the adsorptionyrelease processes and the metal bioavailability in the environment. In general, the mobility of heavy metals in soils is severely limited by strong sorption reactions between metal ions and negatively charged surfaces particles of soils (Stumm, 1987). However, several long-term experiments have evidenced an enhanced mobility of metal ions in organic matter rich soils (Berggren et al, 1990;Li and Shuman, 1996;Streck and Richter, 1997;Kalbitz and Wennrich, 1998).…”

Section: Introductionmentioning

confidence: 99%

Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily

Giacalone

Gianguzza

Orecchio

et al. 2005

Chemical Speciation & Bioavailability

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The content of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, has been determined in the organic and inorganic fraction of eight soil samples from Sicily. A modified type-Tessier sequential extraction procedure has been used to recognize metals in five different fractions categorised as follows: (a) exchangeable metals, (b) metals bound to carbonates, (c) metals bound to iron and manganese oxides, (d) metals bound to organic matter, and (e) metals in residual fraction. The mineralogical composition of soils samples was characterized by X-ray diffraction. Humic substances were extracted by means of an alkaline extraction procedure. It has been found that both the mineralogical composition and the different content of humic fraction of organic matter in the soils investigated are responsible for the observed trace metal distribution. The obtained data show that a significant amount of trace metals is bound to the organic fraction where different binding sites are present simultaneously. In particular, Pb and Cu seem to be the elements more tightly linked to the organic fraction of soils, whilst cadmium is mostly concentrated into the iron and manganese oxides fraction. The presence of clay minerals in soil is significant for metal distribution, playing a fundamental role in binding metal ions. Besides, it has been observed that the calcophile metal mobility is strongly dependent on the presence of sulfide phases. Applying the Risk Assessment Code to the analyzed soils, it appears that they contain, generally, less than 30% of metals in the exchangeable and carbonate fractions. Calcic brown soil from Piano Zucchi exhibits a medium up to very high risk for Pb, Cd, Co, Zn and Mn. It also been recognized the elevated presence of Cd in the exchangeable and carbonate fractions of andic brown soil on volcanites from Pachino.

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“…On the other hand, metal oxides are naturally present as colloidal nanoparticles in aquatic systems and play an important role in the distribution and diffusion of trace metals in the environment (Brown & Parks, 2001). The mechanism of the adsorption of metal ions on metal oxides is generally explained by complex formation between the surface hydroxyl groups of the oxides and the metal ions in water (Balistrieri, Brewer, & Murray, 1981;Stumm et al, 1987;Rahnemaie, Hiemstra, & Van Riemsdijk, 2006;Sverjensky, 2006).…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

Katsuta¹,

Kanaya²,

Bessho³

et al. 2017

IJC

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Radioactive trace 7 Be produced in cooling water systems for high-energy accelerators is known to be captured by metal-oxide colloidal nanoparticles generated through corrosion of metal components in water. This study is aimed at investigating the adsorption behavior of trace Be 2+ onto various oxide nanoparticles (Al 2 O 3 , SiO 2 , TiO 2 , Fe 2 O 3 , CoO, and CuO) dispersed in water at 25 °C in order to clarify the tendency and features of the interaction of Be 2+ with metal oxides. From pH dependence of the distribution ratio of Be 2+ between the nanoparticle phase and the aqueous solution phase, the surface complexation constants (β s,n ) have been determined for the reaction of Be 2+ with the hydroxyl groups on the oxide surface (>S−OH), i.e., Be

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Aquatic surface chemistry. Chemical processes at the particle-water interface

Cited by 73 publications

References 0 publications

Surface Chemistry and Spectroscopy of Chromium in Inorganic Oxides

Surface Chemistry and Spectroscopy of Chromium in Inorganic Oxides

Metals distribution in the organic and inorganic fractions of soil: a case study on soils from Sicily

Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

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