Environmental Exposure to Chromium Compounds in the Valley of Leon, Mexico

Armienta-Hernandez, Maria Aurora; Rodríguez-Castillo, Ramiro

doi:10.2307/3432012

Cited by 15 publications

(10 citation statements)

References 1 publication

(1 reference statement)

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“…Debido a las actividades industriales, como la producción de acero, minería, cemento y curtido de pieles, ciertas zonas de México, tienen altos niveles de cromo en suelo y agua (Armienta-Hernández y Rodríguez, 1995). El uso de lodos de aguas negras o de fertilizantes con diferentes concentraciones del catión, en algunas prácticas agronómicas, son otros de los factores contribuyentes a la contaminación ambiental por el metal (Acevedo-Aguilar et al, 2006).…”

Section: Introductionunclassified

Remoción de Cromo (VI) en Solución Acuosa por la Biomasa Celular de Paecilomyces sp.

Acosta¹,

Cardenas²,

Alvarado-Hernández³

et al. 2008

Inf. tecnol.

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ResumenEl objetivo de este trabajo fue determinar la remoción de Cromo (VI) en solución por la biomasa celular del hongo contaminante ambiental Paecilomyces sp. por el método colorimétrico de la difenilcarbazida. La mayor bioadsorción fue a pH= 1.0±0.2, a 50 o C durante 16 horas con 7.2 mg/200 mL de concentración inicial de Cromo (VI) y 80 mg/200 mL de biomasa celular. Se concluye que la biomasa fúngica remueve adecuadamente Cromo (VI) en solución y puede utilizarse para descontaminar nichos acuáticos contaminados, ya que 1 g de biomasa fúngica remueve 100 mg/200 mL del metal a las tres horas de incubación. Palabras clave: bioadsorción de cromo, biomasa fúngica, descontaminación de aguas, colorimetría Removal of Chromium (VI) from Aqueous Solutions by Fungal Biomass of Paecilomyces sp. AbstractThe objective of this work was to determine the removal of Chromium (VI) on the Paecilomyces sp.; fungal biomass, spectrophotometrically using diphenylcarbazide as the complexing agent. The highest adsorption was obtained at pH= 1.0±0.2, at 50 o C after 16 hours of incubation, with 7.2 mg/200 mL of initial concentration of Chromium (VI) and 80 mg/200 mL of cellular biomass. It was concluded that application of this biomass on the removal of Cr (VI) in aqueous solutions can be used since 1 g of fungal biomass remove 100 mg/200 mL of this metal after three hours of incubation.

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Section: Introductionunclassified

Remoción de Cromo (VI) en Solución Acuosa por la Biomasa Celular de Paecilomyces sp.

Acosta¹,

Cardenas²,

Alvarado-Hernández³

et al. 2008

Inf. tecnol.

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“…The world production of Cr is in the order of 10 7 tons per year; 60^70% is used in alloys, including stainless steel, and 15% is used in chemical industrial processes, mainly leather tanning, pigments and electroplating [1,4,5]. Its widespread use has converted Cr in a serious pollutant of air, soil and water [6,7]. Cr concentrations in non-polluted waters vary from 0.1 to 0.5 ppm in fresh waters and from 0.0016 to 0.05 ppm in oceanic waters [8], but levels as high as 80 ppm have been observed in paper mill e¥uents [9].…”

Section: Introductionmentioning

confidence: 99%

Interactions of chromium with microorganisms and plants

Cervantes

2001

FEMS Microbiology Reviews

156

202

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Chromium is a highly toxic non-essential metal for microorganisms and plants. Due to its widespread industrial use, chromium (Cr) has become a serious pollutant in diverse environmental settings. The hexavalent form of the metal, Cr(VI), is considered a more toxic species than the relatively innocuous and less mobile Cr(III) form. The presence of Cr in the environment has selected microbial and plant variants able to tolerate high levels of Cr compounds. The diverse Cr-resistance mechanisms displayed by microorganisms, and probably by plants, include biosorption, diminished accumulation, precipitation, reduction of Cr(VI) to Cr(III), and chromate efflux. Some of these systems have been proposed as potential biotechnological tools for the bioremediation of Cr pollution. In this review we summarize the interactions of bacteria, algae, fungi and plants with Cr and its compounds.

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“…The chromium content exposure in polluted water and atmosphere is about several ppb to ppm [18][19][20]. The concentration of chromium applied in this work was 70 mM and 0.35-3500 mM in the in vitro and in vivo experiment, respectively.…”

Section: Discussionmentioning

confidence: 89%

Elucidation of the percutaneous absorption of chromium compounds by functional proteomics

et al. 2009

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Chromium compounds are known to be associated with cytotoxicity and carcinogenicity when applied via a skin route. The aim of this study was to evaluate the skin permeability and toxicological profiles of four chromium species. Chromium permeation across the skin, as determined by an in vitro Franz cell, decreased in the order of sodium chromate>potassium chromate>potassium dichromate>chromium nitrate. The uptake of chromium species within the skin generally showed a contrary trend to the results of permeation, although differences among the various compounds were not large. Levels of in vivo skin deposition of the four compounds showed no statistically significant differences. Potassium chromate produced the greatest disruption of the skin structure as determined by HE staining, followed in order by sodium chromate, potassium dichromate, and chromium nitrate. This indicates that hexavalent chromium elicited greater toxicity to the skin compared to trivalent chromium. A similar result was observed for the viability of skin fibroblasts. To improve our understanding of the molecular mechanisms leading to functional changes in proteins, proteomic tools, including 2-DE and MS techniques combined with sequence database correlations, were applied to identify target proteins altered by pathologic states. Eight protein spots, corresponding to cutaneous enzymes involved in energy metabolism and chaperon proteins, which were identified and discussed in this study, were associated with skin cytotoxicity, immunity, and carcinogenesis. In addition, functional proteomics of skin tissues may provide a promising tool for developing therapeutic strategies and can serve as the basis for further research.

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Environmental Exposure to Chromium Compounds in the Valley of Leon, Mexico

Cited by 15 publications

References 1 publication

Remoción de Cromo (VI) en Solución Acuosa por la Biomasa Celular de Paecilomyces sp.

Remoción de Cromo (VI) en Solución Acuosa por la Biomasa Celular de Paecilomyces sp.

Interactions of chromium with microorganisms and plants

Elucidation of the percutaneous absorption of chromium compounds by functional proteomics

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