Determination of chromium(VI) in industrial atmospheres by a catalytic method

Bm, Kneebone; Frieser, H.

doi:10.1021/ac60353a006

Cited by 18 publications

(3 citation statements)

References 2 publications

(4 reference statements)

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“…To obtain fresh cultures, the colonies were first cultivated in LB liquid media, and, once in the exponential phase, a little drop was spread over the last 1 /4 of the agar plate surface and incubated at 35 • C. The same procedure was performed for the control strains. When the colonies were visible (after 2 or 3 days), an agar ortho-dianisidine solution was prepared and immediately poured over the colonies [7,17]; briefly: 0.035 g of ortho-dianisidine (Sigma Aldrich, Toluca, Mexico) was dissolved in 5 mL ethanol (25%), after which 4.23 mL of distilled sterile H 2 O, 194 µL HCl 0.124 M and 580 µL H 2 O 2 0.89 M were added. Then, 10 mL of a sterile agar solution was poured over this solution (0.6%, liquid but not hot) and immediately poured over the bacterial colonies grown on the LB agar plates.…”

Section: Screening By Formation Of Chromium Reduction Halosmentioning

confidence: 99%

Bioprospection of Bacterial Strains from Chromite Process Industry Residues from Mexico for Potential Remediation

Martínez-Aldape,

Sandoval-Vergara,

Padilla-Hernández

et al. 2024

Applied Microbiology

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Industrial residues with high concentrations of hexavalent chromium [Cr(VI)], characterized by an alkaline pH (between 9 and 13) and high salinity (around 100 psu), were used as a source for extremophilic chromium-resistant and -reducing microorganisms. An investigation of biodiversity through MiSeq showed the presence of 20 bacterial classes, with Bacilli (47%), Negativicutes (15%), Bacteriodia (8%), Gammaproteobacteria (7%) and Clostridia (5%) being the most abundant. The bioprospection allowed the cultivation of 87 heterotrophic bacterial colonies and 17 bacterial isolates at the end of the isolation, and screening procedures were obtained. The isolates were related to Cellulosimicrobium aquatile, C. funkei, Acinetobacter radioresistens, Staphylococcus equorum, S. epidermis, Brachybacterium paraconglometratum, Glutamicibacter creatinolyticus, Pseudomonas songnenensis, Microbacterium algeriense and Pantoea eucalypti, most of them being resistant to Cr(VI). Resistances of up to 400 mg.L−1 of chromate were obtained for four related strains (QReMLB55A, QRePRA55, QReMLB33A and QReMLB44C). The C. aquatile strain QReMLB55A and the P. songnenensis strain QReMLB33A were exposed to K2Cr2O7 (200 mg.L−1) under optimal conditions, diminishing 94% and 24% of the Cr(VI) in 6 days, respectively. These strains exhibited a high potential for chromium remediation biotechnologies.

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Section: Screening By Formation Of Chromium Reduction Halosmentioning

confidence: 99%

Bioprospection of Bacterial Strains from Chromite Process Industry Residues from Mexico for Potential Remediation

Martínez-Aldape,

Sandoval-Vergara,

Padilla-Hernández

et al. 2024

Applied Microbiology

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“…However, when it is oxidized to Cr(VI), it becomes highly toxic and more mobile in both groundwater and surface water. The dominant Cr(VI)-species in aqueous solutions are dichromate (Cr 2 O 7 2-) and hydrogen dichromate (HCr 2 O 7 -) [3], [4]. The presence of these compounds is mainly pH-dependent, where Cr 2 O 7 2-dominates in the alkaline conditions unlike HCr 2 O 7 which prefers the acidic medium.…”

Section: Introductionmentioning

confidence: 99%

Optimization Modeling of nFe0/Cu-PRB Design for Cr(VI) Removal from Groundwater

Maamoun

Falyouna

Eljamal

et al. 2021

IJESD

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Hexavalent chromium is one of the highly toxic heavy metals which could lead to severe health issues when it is discharged into aquifers as industrial wastewater. In the current study nFe0/Cu was successfully employed in PRB technology for Cr(VI) removal from groundwater. Batch and column experiments confirmed the high reactive performance of nFe0/Cu towards Cr(VI) removal by around 85% removal efficiency. The main pathways for Cr-species removal by nFe0/Cu were determined as the reduction of Cr(VI) to Cr(III) by both nFe0 and Cu0 and the precipitation/co-precipitation of Cr(III) with the released iron oxides on the nFe0/Cu surface. The developed 3D-surface response optimization model confirmed the reciprocal relation between the residence time, barrier thickness and hydraulic conductivity. The interaction and sensitivity analysis between the model’s parameters were significantly crucial for defining the optimal design conditions of the nFe0/Cu-PRB. Generally, the current study could represent a great contribution in scaling-up the PRB technology towards the real field applications.

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“…The oxidation reaction of o-dianisidine with H 2 O 2 has been widely used in catalytic methods. Chromium, 7,8 phosphorus-containing pesticides 9 and phenols using various peroxidases 10 have been determined on the basis of their catalytic or inhibitory effects on the kinetics of this reaction. Dianisidine has also been employed as a mediator in electrochemical studies and procedures.…”

Section: Introductionmentioning

confidence: 99%

o-Dianisidine: a new reagent for selective spectrophotometric, flow injection determination of chlorine

Icardo

Mateo²,

Calatayud

2001

Analyst

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A flow injection analysis (FIA) procedure for the determination of free chlorine in industrial formulations and water samples is proposed. The manifold is provided with a gas-diffusion unit which permits the removal of interfering species and also the preconcentration of chlorine. The determination of chlorine is performed on the basis of the oxidation by o-dianisidine as a chromogenic reagent to a coloured product which can be monitored at 445 nm. The method (for a preconcentration step of 60 s) is linear over the range 0.04-1.00 mg l(-1) of chlorine, the limit of detection is 0.04 mg l(-1), the reproducibility of the procedure (as RSD of the slope) is 3.7% for a series of four independent calibrations, the precision (as RSD of a series of 30 continuous FIA peaks of 0.56 mg l(-1) of chlorine) is 1.4% and the sample throughput is 40 h(-1). A detailed comparative study of the analytical characteristics of a single mono-channel reverse FIA assembly and the same system but provided with a Fluoropore membrane filter of 0.5 microm pore size was performed to check the advantages of the new approach in terms of sensitivity, selectivity and limit of detection.

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Determination of chromium(VI) in industrial atmospheres by a catalytic method

Cited by 18 publications

References 2 publications

Bioprospection of Bacterial Strains from Chromite Process Industry Residues from Mexico for Potential Remediation

Bioprospection of Bacterial Strains from Chromite Process Industry Residues from Mexico for Potential Remediation

Optimization Modeling of nFe0/Cu-PRB Design for Cr(VI) Removal from Groundwater

o-Dianisidine: a new reagent for selective spectrophotometric, flow injection determination of chlorine

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