Reduction and Oxidation Processes of Chromium in Soils

Kozuh, N.; Štupar, Janez; Gorenc, B.

doi:10.1021/es981162m

Cited by 191 publications

(93 citation statements)

References 31 publications

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“…Esse processo de redução é ainda mais acentuado quando se tem solos com pH ácido. [21][22][23] Para elucidar os resultados obtidos e considerando-se um possível processo redox entre Cr(VI) e matéria orgânica, determinaram-se os teores de matéria orgânica nas amostras de solo contaminadas (Tabela 3).…”

Section: Resultados E Discussão Estabilidade Do íOn Cr(vi)unclassified

Especiação redox de cromo em solo acidentalmente contaminado com solução sulfocrômica

Matos¹,

Nóbrega²,

Souza³

et al. 2008

Quím. Nova

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Recebido em 3/10/07; aceito em 15/2/08; publicado na web em 13/8/08 CHROMIUM REDOX SPECIATION IN SOIL ACCIDENTALLY CONTAMINATED WITH SULPHOCHROMIC SOLUTION. Determination of Cr(VI) and Cr(III) was studied in soil samples accidentally contaminated with sulphochromic solution. Molecular absorption spectrophotometry based on the diphenylcarbazide method was used for the determination of Cr(VI) after its alkaline extraction. The total chromium concentration was determined using ICP OES. The quantification of Cr(III) was accomplished by subtracting the Cr(VI) concentration from the total chromium concentration. Regardless of the known contamination of the soil samples by sulphochromic solution, concentrations of Cr(VI) were below the detection limit. Addition and recovery experiments for Cr(VI) in soil samples with and without organic matter indicated its influence on the reduction of Cr(VI) to Cr(III).

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Section: Resultados E Discussão Estabilidade Do íOn Cr(vi)unclassified

Especiação redox de cromo em solo acidentalmente contaminado com solução sulfocrômica

Matos¹,

Nóbrega²,

Souza³

et al. 2008

Quím. Nova

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“…(Rauret et al, 1999;Bacon and Davidson, 2008) Step Fraction Extraction solution Table 2). 그러나, Fe(II)로 환원이 완료되어 (Kozuh et al, 2000;Kumpiene et al, 2008;Landrot et al, 2010). 토양시 료를 대상으로 XANES의 분석을 실시하여 토양 중 Mn(IV)이 존재함을 확인하였다 (Fig.…”

Section: 따라서 중금속으로 오염된 토양을 효과적으로 정화하기unclassified

Feasibility Study on Stabilization Technique of Cr(VI)-contaminated Site

Yoon¹,

Yoo²,

Ko³

et al. 2017

Journal of Soil and Groundwater Environment

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In this study, a remedial investigation using reductive stabilization was conducted to treat Cr(VI)-contaminated soil. The influences of various operational parameters, including reaction time and the mass of ferrous iron, were also evaluated. The study site was contaminated with a large amount of Cr(III) and Cr(VI), and the selected treatment method was to stabilize Cr(VI) with ferrous iron, which reduced Cr(VI) to Cr(III) and stabilized the chromium, although a greater mass of ferrous iron than the stoichiometric amount was required to stabilize the Cr(VI). However, some Cr(III) re-oxidized to Cr(VI) during the drying process, and addition of a strong reducing agent was required to maintain reducing conditions. With this reducing agent, the treated soil met the required regulatory standard, and the mass of Cr(III) re-oxidized to Cr(VI) was significantly reduced, compared to the use of only Fe(II) as a reducing agent.

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“…Compared with 16% for the control, bioaccessible Cr decreased to 13% for 1:0.5 Mn and P; 12% for 1:2 Mn and P; and 13% for 1:5 Mn and P. After 30 days, the bioaccessible fraction increased slightly and was no longer significantly different than the control at p<5%, but was different at p<10%. Manganese can rapidly oxidize Cr(III) to Cr(VI) (Kozuh et al, 2000). This was a concern in this project, since there was a slight increase in the bioaccessible fraction of Cr with the addition of Mn.…”

Section: Smelter Soilmentioning

confidence: 99%