Solubility of amorphous chromium(III)-iron(III) hydroxide solid solutions

Sass, Bruce; Rai, Dhanpat

doi:10.1021/ic00261a013

Cited by 342 publications

(231 citation statements)

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“…On the other hand, in the soil environments, Cr occurs in oxidation states Cr(III) and Cr(VI), which govern its mobility and toxicity (Bartlett and James, 1979). In Cr(III)-dominated systems, the prevalent species is CrOH at pH 2q 2-6, Cr(OH) at pH 6.5-11.5 and Cr(OH) at 0 y 3 4 pH)11.5 (Sass and Rai, 1987). In the presence of Fe(III) in geological environments, the solubility of Cr(III) is ubiquitously controlled by the solid solution (Cr,Fe)(OH) (Sass and Rai, 1987).…”

Section: Chemistry Of Cca Metals In Soilsmentioning

confidence: 99%

“…In Cr(III)-dominated systems, the prevalent species is CrOH at pH 2q 2-6, Cr(OH) at pH 6.5-11.5 and Cr(OH) at 0 y 3 4 pH)11.5 (Sass and Rai, 1987). In the presence of Fe(III) in geological environments, the solubility of Cr(III) is ubiquitously controlled by the solid solution (Cr,Fe)(OH) (Sass and Rai, 1987).…”

Section: Chemistry Of Cca Metals In Soilsmentioning

confidence: 99%

“…7b). Trivalent Cr coexisting with the Fe-oxyhydroxides in these soils may also be released due to reductive dissolution at low pH (Sass and Rai, 1987;see Fig. 3).…”

Section: Mechanisms Of Metal Removalmentioning

confidence: 99%

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Metal contamination at a wood preservation site: characterisation and experimental studies on remediation

Bhattacharya

Mukherjee

Jacks

et al. 2002

The Science of The Total Environment

108

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The aim of this investigation was to determine the occurrence of As, Cu, Cr and Zn in the soil at an abandoned wood preservation unit and to examine some possible extractants for the contaminants in the soil. The mean As content of the contaminated surface soils (0-10 cm) was 186 mg kg , where as the mean concentrations of Cu, Cr y1 and Zn in soils from the contaminated area were 26, 29 and 91 mg kg , respectively. The elevated As content in y1 the mineral soils is related to adsorption of inorganic As phases in the fine grained fractions, which are characterised by large surface area and high positive surface charge under the current acidic conditions. Cu and Cr were found to be rather mobile, which is reflected in their lower abundance in soils and significant accumulation in sediments in the drainage leaving the area. The fine fraction of the soil (-0.125 mm) has an average metal content increased by nearly 34% as compared to the -2-mm fraction conventionally used for the analysis and assessment of soil contamination. The -2-mm fraction constitutes approximately 65% of the total weight while the fine fraction (-0.125 mm) constitutes approximately 10%. These facts, taken together, are essential for the choice of remediation measures. Oxalate solutions have been tested as extractants for soil remediation. Dark acid oxalate extraction dissolves the amorphous Al-and Fe-oxides and hydroxides and mobilises the adsorbed inorganic As species. Oxalate also acts as a ligand for the cationic heavy metals, releasing them from exchangeable sites. With a three-step sequential leaching, up to 98-99% of the metals could be removed. At lower concentrations and higher pH, the leaching decreased to approximately 70%. ᮊ

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Section: Chemistry Of Cca Metals In Soilsmentioning

confidence: 99%

Section: Chemistry Of Cca Metals In Soilsmentioning

confidence: 99%

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Metal contamination at a wood preservation site: characterisation and experimental studies on remediation

Bhattacharya

Mukherjee

Jacks

et al. 2002

The Science of The Total Environment

108

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“…Higher dissolution of electrode material (Faraday's law) with high rate of formation of monomeric and/or polymeric iron hydroxides result in significant improvement in Cr 3+ removal mainly due to co-precipitation forming solid solution like species. This effect is solely dominant at the beginning of the experiments as Cr(OH) is significantly soluble at this pH (at the initial stage) and [Cr, Fe](OH) has lower solubility than Cr(OH) (s) [12]. Due to elevated dissolution rate of anode, more sludge from the metal electrodes is generated.…”

Section: Results and Discussion Effect Of Current Density And Operatmentioning

confidence: 99%

Removal of Cr 3+ by electrocoagulation from simulated wastewater

et al. 2014

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Trivalent chromium (Cr 3+) removal from aqueous solution by electrocoagulation using iron electrodes material was investigated in this paper. Effects of current density, initial concentration of Cr 3+ , operating time, pH, electrode distance, and operating cost have been investigated. At higher current density and solution pH, remarkable removal of Cr 3+ was observed. Experiments have been show that the maximum removal percentage of the Cr 3+ 99.89% was at initial concentration 1000 mg/L, current density 9.34 mA/cm 2 and reaction time 1 hours. Energy consumption was calculated for Cr 3+ removal at different time. The method is observed to be very effective in the removal Cr 3+ ion from aqueous solution. Electrocoagulation process need simple equipment, designable any size, use any chemical substances and low operating cost.

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“…6 Por outro lado, Cr(III) precipita como Cr(OH) 3 ou Fe x Cr 1-x (OH) 3 ou ainda forma quelatos com moléculas orgânicas, tendo portanto menor mobilidade no solo. 7,8 Pela toxicidade do Cr(VI) comparativamente ao Cr(III), a especiação redox de cromo se tornou importante, possibilitando um monitoramento ambiental bem mais adequado que apenas a quantificação do teor total do elemento. Devido à legislação estar se tornando cada vez mais restritiva, concentrações limites de Cr(VI) em diferentes matrizes sólidas estão sendo estabelecidas.…”

Section: Introductionunclassified

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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Solubility of amorphous chromium(III)-iron(III) hydroxide solid solutions

Cited by 342 publications

References 0 publications

Metal contamination at a wood preservation site: characterisation and experimental studies on remediation

Metal contamination at a wood preservation site: characterisation and experimental studies on remediation

Removal of Cr 3+ by electrocoagulation from simulated wastewater

Especiação redox de cromo em solo acidentalmente contaminado com solução sulfocrômica

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