title: The redox processes in Hg-contaminated soils from Descoberto (Minas Gerais, Brazil): implications for the mercury cycle.
abstract: Investigations of the redox process and chemical speciation of Hg(II) lead to a better understanding of biogeochemical processes controlling the transformation of Hg(II) into toxic and bioaccumulative monomethyl mercury, mainly in areas contaminated with Hg(0). This study investigates the speciation and redox processes of Hg in soil samples from a small area contaminated with Hg(0) as a result of gold mining activities in the rural municipality of Descoberto (Minas Gerais, Brazil). Soil samples were prepared by adding Hg(0) and HgCl2 separately to dry soil, and the Hg redox process was monitored using thermodesorption coupled to atomic absorption spectrometry. A portion of the Hg(0) added was volatilized (up to 37.4±2.0%) or oxidized (from 36±7% to 88±16%). A correlation with Mn suggests that this oxidation is favored, but many other factors must be evaluated, such as the presence of microorganisms and the types of organic matter present. The interaction of Hg with the matrix is suggested to involve Hg(II)-complexes formed with inorganic and organic sulfur ligands and/or nonspecific adsorption onto oxides of Fe, Al and/or Mn. The kinetics of the oxidation reaction was approximated for two first-order reactions; the faster reaction was attributed to the oxidation of Hg(0)/Hg(I), and the slower reaction corresponded to Hg(I)/Hg(II). The second stage was 43-139 times slower than the first. The samples spiked with Hg(II) showed low volatilization and a shifting of the signal of Hg(II) to lower temperatures. These results show that the extent, rate and type of redox process can be adverse in soils. Descoberto can serve as an example for areas contaminated with Hg(0).
authors.affiliation: Departamento de Química, ICEX, UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil. Electronic address: claucw@netuno.lcc.ufmg.br.
authors.forename: Cláudia C
authors.initials: CC
authors.lastname: Windmöller
authors.affiliation: IFMG-Campus Formiga, Rua Padre Alberico, 44, São Luiz, Formiga, MG, Brazil.
authors.forename: Walter A
authors.initials: WA
authors.lastname: Durão Júnior
authors.affiliation: Departamento de Química, ICEX, UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Aline
authors.initials: A
authors.lastname: de Oliveira
authors.affiliation: IFAM-Campus Manaus Centro, Av. Sete de setembro, 1975, 69020-120 Manaus, AM, Brazil.
authors.forename: Cláudia M
authors.initials: CM
authors.lastname: do Valle
mesh_terms: D000327:Adsorption; D001938:Brazil; D004784:Environmental Monitoring; D008628:Mercury / Q000378:metabolism*; D017669:Mercury Compounds / Q000378:metabolism*; D008906:Mining; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000378:metabolism*; D013054:Spectrophotometry, Atomic; D014835:Volatilization
chemical_list: D017669:Mercury Compounds; D012989:Soil Pollutants; D008628:Mercury
keywords: Contaminated soils; Mercury cycle; Redox process; Speciation