Results 251 to 260 of about 1,865,203 (286)
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Environmental Science and Pollution Research, 2021
Microbial fuel cell is an efficient technology to reduce pollutants of the heavy metal ions. Herein, a dual-chamber microbial fuel cell (MFC) coupled with abio-cathode and electrochemically active bacteria is fabricated to treat Cr (VI) containing wastewater and harvest bioelectricity simultaneously.
Xiuling, Zhang +2 more
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Microbial fuel cell is an efficient technology to reduce pollutants of the heavy metal ions. Herein, a dual-chamber microbial fuel cell (MFC) coupled with abio-cathode and electrochemically active bacteria is fabricated to treat Cr (VI) containing wastewater and harvest bioelectricity simultaneously.
Xiuling, Zhang +2 more
openaire +2 more sources
Cr(III) and Cr(VI) in leather and elicitation of eczema
Contact Dermatitis, 2006The aim of the present study was to investigate the relation between the content of Cr(VI) and soluble Cr(III) in leather and the ability of the leather to elicit eczema in chromium allergic patients. An array of chromium‐tanned leather samples was analysed for the content of total Cr(VI) and soluble Cr(III) using the DIN 53314 and the DS/EN 420 ...
Malene Barre, Hansen +2 more
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2011
????????i?????????? ?????????????? ????i????i?? Cr(VI) ?? ????????????i ??i?????????????? ??i?????????????????????? ??i???????????? ????????????i?? ??????????i?????? ????????????????, ?????? ??????????i???????????? ???????????????????????????? ?????????????????? ?????????? i????i????. ???????????????????? ?????????? ???????????????????? ????????????????
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????????i?????????? ?????????????? ????i????i?? Cr(VI) ?? ????????????i ??i?????????????? ??i?????????????????????? ??i???????????? ????????????i?? ??????????i?????? ????????????????, ?????? ??????????i???????????? ???????????????????????????? ?????????????????? ?????????? i????i????. ???????????????????? ?????????? ???????????????????? ????????????????
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Chemistry of Cr(VI) in a constructed wetland
Environmental Science & Technology, 1995The feasibility of the use of constructed wetlands to treat acidic wastes containing hexavalent chromium is successfully demonstrated on a laboratory scale. The chemistry of Cr(VI) in this system has been determined. Cr(VI) removal is highly dependent upon the organic content of the wetland matrix.
J D, Makos, D C, Hrncir
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Reduction of Cr(VI) by caffeic acid
Chemosphere, 2007In the soil-plant system, the Cr(VI) toxicity can be moderated through redox reactions involving phenolic substances. In such a context, we report the reducing activity of caffeic acid (CAF) towards Cr(VI) in aqueous phase. The redox reaction between Cr(VI) and CAF was studied as a function of both time and pH at different initial metal concentrations.
DEIANA, Salvatore Andrea +2 more
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Bioremediation of Cr(VI) in contaminated soils
Journal of Hazardous Materials, 2005Ex situ treatment of hexavalent chromium (Cr(VI)) contaminated soil using a bioreactor-biosorption system was evaluated as a novel remediation alternative. Leaching of Cr(VI) from the contaminated soil using various eluents showed that desorption was strongly affected by the solution pH. The leaching process was accelerated at alkaline conditions (pH 9)
K Rama, Krishna, Ligy, Philip
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Chromium allergy: significance of both Cr(III) and Cr(VI)
Contact Dermatitis, 2003Most studies investigating chromium allergy have been performed with Cr(VI). However, real exposure to chromium from leather products includes both Cr(III) and Cr(VI). We have determined and compared the minimum elicitation threshold (MET) concentration for Cr(III) and Cr(VI) in Cr(VI)‐sensitive patients.
M B, Hansen, J D, Johansen, T, Menné
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Analytica Chimica Acta, 2005
Threshold values for Cr(VI) in various types of solid matrices have been set up to protect human health and biota. To ascertain the compliance of solids with these limits different types of extractants and different conditions of pH and temperature have been proposed in the literature.
PETTINE M, CAPRI S
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Threshold values for Cr(VI) in various types of solid matrices have been set up to protect human health and biota. To ascertain the compliance of solids with these limits different types of extractants and different conditions of pH and temperature have been proposed in the literature.
PETTINE M, CAPRI S
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Electroanalysis, 2008
AbstractA sensitive and selective protocol for the extraction of all forms of Cr(VI) from solid materials followed by determination by catalytic adsorptive stripping voltammetry has been elaborated. Cr(VI) was leached to a solution with 0.2 mol L−1 (NH4)2SO4/NH4OH+0.1 mol L−1 EDDS (pH 9.5) and simultaneously Cr(III) was transferred to a nonactive ...
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AbstractA sensitive and selective protocol for the extraction of all forms of Cr(VI) from solid materials followed by determination by catalytic adsorptive stripping voltammetry has been elaborated. Cr(VI) was leached to a solution with 0.2 mol L−1 (NH4)2SO4/NH4OH+0.1 mol L−1 EDDS (pH 9.5) and simultaneously Cr(III) was transferred to a nonactive ...
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2018
Hydrogel and xerogel of Cr(VI)-containing hydrated zirconium dioxide, which had been obtained from both cation- and anion-substituted forms, were investigated with an impedance spectroscopy method. It was shown that complex composition of the amphoteric inorganic ion-exchanger and also protonization of its functional groups, which influence the ...
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Hydrogel and xerogel of Cr(VI)-containing hydrated zirconium dioxide, which had been obtained from both cation- and anion-substituted forms, were investigated with an impedance spectroscopy method. It was shown that complex composition of the amphoteric inorganic ion-exchanger and also protonization of its functional groups, which influence the ...
+6 more sources