A screening method for detection of hexavalent chromium levels in soils

Franco, Débora V.; Rodrigues, Maria Lucia Kolowski; Bavaresco, Jovana; Jardim, Wilson F.

doi:10.1590/s0100-40422011000700025

Cited by 6 publications

(3 citation statements)

References 12 publications

(18 reference statements)

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“…Many reliable methods about Cr speciation that propose alternatives offering low-cost, high sensitivity and waste reduction are observed in the literature [12][13][14][15][16]. Digital image analyses are found for analytical methods in different matrices [17][18][19][20][21][22][23][24][25][26][27][28][29][30] and also for environmental monitoring and remote sensing [31,32].…”

Section: Introductionmentioning

confidence: 99%

Proposition of a simple method for chromium (VI) determination in soils from remote places applying digital images: A case study from Brazilian Antarctic Station

Oliveira

Canevari

Guerra

et al. 2013

Microchemical Journal

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In this study, we proposed a straightforward approach that could be used for Cr redox speciation in soil samples from remote places. For this aim, soil samples under strong anthropogenic impact, from the vicinity of the Brazilian Antarctic Station were studied. Control samples with no direct impact, were also collected further (4 km) from the station. A preliminary laboratory evaluation for Cr (VI) presence was performed using X-ray absorption spectroscopy. The proposed method was based on a hot alkaline extraction to promote the quantitative extraction of Cr (VI) from soil samples. The colorimetric reagent 1,5-diphenylcarbazide (DPC) was added to the extracts to form a violet complex with Cr (VI). A simple and inexpensive commercial scanner was used to acquire the digital images of the formed complex. Partial Least Squares models were constructed with the following average color descriptors: red (R), green (G), blue (B), hue (H), saturation (S), value (V), relative color descriptors (r, g and b) and luminosity (L). The results obtained with this scanner approach were consistent with the official method that uses a spectrophotometer at 540 nm. Besides that, this is the first study that reports Cr redox speciation in soils from Antarctica, which is regarded as the less polluted place on the Earth.

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Section: Introductionmentioning

confidence: 99%

Proposition of a simple method for chromium (VI) determination in soils from remote places applying digital images: A case study from Brazilian Antarctic Station

Oliveira

Canevari

Guerra

et al. 2013

Microchemical Journal

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“…Chromium-contaminated media such as acid mine drainage, , contaminated soils, − aerosols in industrial area, − and industrial wastes are found in acidic conditions. Furthermore, most of the natural samples contain significantly high percentage of the trivalent form (Cr(III)) (75–100%) than the hexavalent form (Cr(VI)) because of thermodynamic stability of Cr(III) in acidic conditions .…”

Section: Resultsmentioning

confidence: 99%

Cr(VI) Formation via Oxyhalide-Induced Oxidative Dissolution of Chromium Oxide/Hydroxide in Aqueous and Frozen Solution

Min

Kim

et al. 2020

Environ. Sci. Technol.

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The oxidative dissolution of Cr(III) species (Cr2O3 and Cr(OH)3) by oxyhalide species, which produces hexavalent chromium (Cr(VI)), was studied in aqueous and frozen solution. The oxyhalide-induced oxidation of Cr(III) in frozen solution showed a different trend from that in aqueous solution. Cr(VI) production was higher in frozen than aqueous solution with hypochlorous acid (HOCl) and bromate (BrO3 –) but suppressed in frozen solution with hypobromous acid (HOBr) and periodate (IO4 –). In particular, bromate markedly enhanced Cr(VI) production in frozen solution, whereas it had a negligible activity in aqueous solution. On the contrary, periodate produced Cr(VI) significantly in aqueous solution but greatly suppressed it in frozen solution. Bromate was found to be much more concentrated in the ice grain boundary than periodate according to both chemical and Raman spectral analyses. The oxidative transformation of Cr(III) to Cr(VI) was accompanied by the concurrent and stoichiometric reduction of oxyhalide species. Dissolved O2 had little effect on the oxidative dissolution, but dissolved organic matter retarded the oxidation of Cr2O3 in both aqueous and frozen conditions. This study proposes that the oxyhalide-induced oxidation of Cr(III) (particularly by bromate) in frozen conditions might have a significant effect on the generation of Cr(VI) in the frozen environment.

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“…16 Por fim, cabe ressaltar que o teor de cromo total do estéril é menor ou próximo ao teor de cromo de vários solos utilizados para agricultura no Brasil, o que indica que, em princípio, o estéril poderia ser aplicado como corretivo de acidez, entretanto, não seria recomendado seu uso em solos com baixo teor de cromo e/ou com ambientes químicos que possam promover a oxidação do Cr(III) a Cr(VI). 10,17 A análise do difratograma de raios X do estéril, 4 A identificação dos picos relacionados à antigorita sugere que a rocha em estudo pertence ao grupo dos serpentinitos. Ademais, a análise dos resultados de DRX sugere que a rocha tenha sofrido alterações na sua composição mineralógica original, uma vez que os picos mais intensos no difratograma de raios X do estéril são referentes à dolomita e a calcita.…”

Section: Resultsunclassified

Caracterização e classificação quanto ao risco ambiental do estéril da mina de cromita do município de Andorinha, Bahia

et al. 2012

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Recebido em 10/2/12; aceito em 11/6/12; publicado na web em 14/8/12 CHARACTERIZATION AND CLASSIFICATION OF THE ENVIRONMENTAL RISK OF HOST ROCK FROM A CHROMITE MINE IN ANDORINHA / BAHIA / BRAZIL. The mineral waste studied was host rock from a chromite mine located in Andorinha/Bahia, extracted and stockpiled in yards without specific application. Host rock was submitted to chemical analysis, XRD, SEM-EDS, IR and TGA and classified according to ABNT standards for solid waste classification. Analyses confirmed that this host rock, classified as ultrabasic, consists mainly of dolomite, calcite and diopside. Hazard assessment results showed this host rock should be classified as class II B-inert waste, important for its potential application in agriculture as a soil acidity correction agent.

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A screening method for detection of hexavalent chromium levels in soils

Cited by 6 publications

References 12 publications

Proposition of a simple method for chromium (VI) determination in soils from remote places applying digital images: A case study from Brazilian Antarctic Station

Proposition of a simple method for chromium (VI) determination in soils from remote places applying digital images: A case study from Brazilian Antarctic Station

Cr(VI) Formation via Oxyhalide-Induced Oxidative Dissolution of Chromium Oxide/Hydroxide in Aqueous and Frozen Solution

Caracterização e classificação quanto ao risco ambiental do estéril da mina de cromita do município de Andorinha, Bahia

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