Aqueous S(IV) oxidation—I. Catalytic effects of some metal ions

Grgić, Irena; Hudnik, V.; Bizjak, M.; Levec, Janez

doi:10.1016/0960-1686(91)90017-2

Cited by 53 publications

(33 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Catalysis of S(IV) autoxidation by iron and manganese has been investigated in many laboratory studies (Conklin and Hoffmann (1988), Kraft and van Eldik (1989), Martin et al (1991), Grgić et al (1991), Berglund et al (1993), Kotronarou and Sigg (1993), Brandt et al (1994), Berglund and Elding (1995), Warneck and Ziajka (1995)). In Grgić et al (1998;, laboratory investigations showed that oxalate has a strong inhibiting effect on the conversion of S(IV) to S(VI) in the presence of Fe(II) or Fe(III) due to the formation of Fe(III)-oxalato-complexes.…”

Section: Introductionmentioning

confidence: 99%

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

et al. 2004

View full text Add to dashboard Cite

Abstract.A new modelling study of the role of transition metal ions on cloud chemistry has been performed. Developments of the Model of Multiphase Cloud Chemistry (M2C2; Leriche et al., 2001) are described, including the transition metal ions reactivity emission/deposition processes and variable photolysis in the aqueous phase. The model is then applied to three summertime scenarios under urban, remote and marine conditions, described by Ervens et al. (2003).Chemical regimes in clouds are analyzed to understand the role of transition metal ions on cloud chemistry and especially, on H x O y chemistry, which consequently influences the sulphur and the VOCs chemistry in droplets. The ratio of Fe(II)/Fe(III) exhibits a diurnal variation with values in agreement with the available measurements of Fe speciation. In the urban case, sensitivity tests with and without TMI chemistry, show an enhancement of OH concentration in the aqueous phase when TMI chemistry is considered.

show abstract

Section: Introductionmentioning

confidence: 99%

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Tabela 5. Concentração de metais em fase aquosa atmosférica 12,14 Fe (mg L (10) A forma I está presente em solução aquosa, somente em concentrações muito baixas, quando comparada à forma II 62,63 . A ligação H-S parece ser energeticamente mais favorável 64 .…”

Section: Dióxido De Enxofreunclassified

“…A oxidação do S(IV) em fase aquosa, por O 2 , tem sido estudada por vários pesquisadores [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] , sendo que os resultados têm sido objeto de considerável controvérsia, em diversos aspectos. Para reações não catalisadas, a dependência com a concentração do oxigênio é discutida na literatura (Tabela 11).…”

Section: Reação De Oxidação Do S(iv) Em Presença De Oxigêniounclassified

“…As várias reações que podem contribuir para a oxidação do SO 2 a sulfato em fase aquosa têm sido estudadas por muitos investigadores [9][10][11][12][13][14][15] . A oxidação por H 2 O 2 parece ser a mais favorável devido à alta velocidade de reação, porém na ausência de concentrações significativas de H 2 O 2 na atmosfera, a oxidação por ozônio ou por oxigênio catalisada por metais de transição pode se tornar significante 1,14 .…”

Section: Introductionunclassified

“…A maioria dos estudos realizados em laboratório, sobre a oxidação de S(IV) catalisada por metais, tem focalizado as reações em solução aquosa em presença de O 2 e dos íons metálicos Mn(II), Fe(III), Cu(II) e Co(II) ou na interação entre oxigênio e sulfitos 9,16 . Apesar do grande número de estudos sobre a oxidação de espécies de S(IV) catalisada por metais, existe discussão na literatura com relação a quais íons metálicos são os catalisadores mais importantes na atmosfera 12,[17][18][19][20][21][22][23][24][25][26] . As discordâncias podem ser observadas nos diferentes valores de constantes de velocidade, de energias de ativação e na dependência com o pH, para as reações estudadas 9,26 .…”

Section: Introductionunclassified

See 2 more Smart Citations

Química atmosférica do enxofre (IV): emissões, reações em fase aquosa e impacto ambiental

Martins¹,

Andrade²

2002

Quím. Nova

View full text Add to dashboard Cite

Metals in Aerosols

Grgić

2008

Environmental Chemistry of Aerosols

View full text Add to dashboard Cite

Atmospheric aerosols have important role in the biogeochemistry and transportation of metals in the atmosphere. On a mass basis, so-called trace metals represent a relatively small proportion of the atmospheric aerosol (generally less than 1%). Among them are transition metals (TM) (e.g. vanadium, chromium, manganese, iron, cobalt, nickel, copper, etc.), which have several oxidation states, and thus can participate in many important atmospheric redox reactions. Field measurements provide strong evidence that TM are common components in aerosol particles as well as in atmospheric liquid water [1][2][3][4][5].The concentrations of trace metals in atmospheric aerosols are a function of their sources. Natural emissions of trace metals result from different processes acting on crustal minerals (e.g. erosion, surface winds and volcanic eruptions), as well as from natural burning and from the oceans. On a global scale, resuspended surface dusts make a large contribution to the total natural emission of trace metals to the atmosphere (e.g. more than 50% of Cr, Mn and V, and more than 20% of Cu, Mo, Ni, Pb, Sb and Zn), whereas volcanism presumably generates about 20% of Cd, Hg, As, Cr, Cu, Ni, Pb and Sb [6]. Sea-salt aerosols generated by spray and wave action may contribute to about 10% of total trace metals emissions. Biomass combustion can contribute to emissions of Cu, Pb and Zn [7]. The predominant anthropogenic sources are due to high-temperature processes, biomass burning, fossil-fuel combustion, industrial activity, incineration, etc. Anthropogenic high-temperature processes result in the release of volatile metals as vapours forming particles by condensation or gas-to-particle reactions. Combustion of fossil fuels is the most important anthropogenic source of atmospheric Be, Co, Hg, Mo, Ni, Sb, Se, Sn and V; it also contributes to emissions of As, Cr, Cu, Mn and Zn [6]. Industrial metallurgical processes produce the largest emissions of As, Cd, Cu, Ni and Zn. Exhaust emissions from gasoline-and diesel-fuelled vehicles contribute to atmospheric Pb, Fe, Cu, Zn, Ni and Cd, while tyre-rubber abrasion to Zn [8]. In the last decade, the use of new automobile catalytic converters also contributes to the emissions of Pt, Pd and Rh [9, 10]. The composition of aerosols depends on the occurrence of metals in combustion processes and their volatility as well as on their amount produced by decomposition of continental and oceanic surfaces. Thus, the size distributions of different metals depend on the balance of different sources.Environmental Chemistry of Aerosols Edited by Ian Colbeck

show abstract

Aqueous S(IV) oxidation—I. Catalytic effects of some metal ions

Cited by 53 publications

References 18 publications

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

Química atmosférica do enxofre (IV): emissões, reações em fase aquosa e impacto ambiental

Metals in Aerosols

Contact Info

Product

Resources

About

Aqueous S(IV) oxidation—I. Catalytic effects of some metal ions

Cited by 53 publications

References 18 publications

The role of transition metal ions on HO&lt;sub&gt;x&lt;/sub&gt; radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

The role of transition metal ions on HO&lt;sub&gt;x&lt;/sub&gt; radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

Química atmosférica do enxofre (IV): emissões, reações em fase aquosa e impacto ambiental

Metals in Aerosols

Contact Info

Product

Resources

About

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry