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Showing 1 to 20 of 37 for “"hexavalent chromium"”.
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Bioremediation of hexavalent chromium using gram-negative bacteria.
Hexavalent chromium (Cr (VI)), the most toxic form of chromium, is widely used in industrial processes. As a result substantial amounts of Cr (VI) contaminated wastes are produced. The use of microbial cells as bioremediation of heavy metals is a potential alternative to conventional chemical …
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Removal of hexavalent chromium from a contaminated soil by electroremediation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Isotopic fractionations associated with hexavalent chromium cycling in the natural subsurface
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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In-situ reduction of hexavalent chromium by electroremediation with ferrous iron
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Investigation of Hexavalent Chromium Reduction by Aerobic Bacteria in Water and Soil
<p>Hexavalent chromium (Cr(VI)) has been identified as a high priority pollutant by the U.S. Environmental Protection Agency because of its high toxicity and carcinogenicity. Cr(VI) is commonly used in electroplating, pigment, leather processing and mining resulting in widespread Cr(VI) pollution, …
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Exploring Bioelectrochemical Systems for Removal and Recovery of Hexavalent Chromium or Nutrients
… to explore the potential to remove and recover hexavalent Chromium from synthetic wastewater, and ammonia and phosphate from digested manure. The BES was able to achieve 99.6% removal of Chromium by membrane adsorption in 5 days but failed to recover in the concentration chamber. Nutrients were …
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Effects of hexavalent chromium on the growth and reproduction of Chironomus riparius (Diptera)
Effects of hexavalent chromium on the life cycle of Chironomus riparius were examined in the laboratory, using sublethal (0.5 mg/1) and 40% lethal (2.0 mg/1) concentrations. Chironomus egg masses were introduced into both control and chromium-treated 21 1 aquaria. Larvae were subsampled at 5-day …
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Synthesis of anion exchange/activated carbon fiber hybrid materials for aqueous adsorption of toxic hexavalent chromium
Hexavalent chromium, also known popularly as the “Erin Brockwich chemical”, has recently been identified as a carcinogen by ingestion. Unfortunately, it is present in drinking water supplies in United States. An effective, Point-of-Use (POU) based technology to remove Cr(VI) in tap water is …
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Development of teawaste based bio-sorbent materials for removal of Cr(VI) from wastewater
… and the stability of the ecological environment. Hexavalent chromium in industrial waste water is a common typical heavy metal ion. Therefore, how to effectively treat heavy metal pollution in water has become a hot topic in the field of water pollution control. <br/><br/>In this research …
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Measurement of inorganic arsenic and chromium species in southern Nevada groundwater using ion chromatography-inductively coupled plasma mass spectrometry
… arsenite from arsenate and trivalent from hexavalent chromium in southern Nevada groundwater. Method detection limits were found to be 0.011 ppb and 0.005 ppb for arsenite and arsenate respectively, and 0.015 ppb and 0.02 ppb for trivalent and hexavalent chromium respectively. Following an …
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Metal contamination and methane oxidising bacteria around a formerly industrialised suburban river.
… capsulatus (Bath) was also able to remediate hexavalent chromium contamination. In the current study sediment samples were enriched from an urban river in Sheffield in Northern England that has previously suffered serious heavy metal pollution due to previous activity of the steel industry …
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Metal contamination and methane oxidising bacteria around a formerly industrialised suburban rive
… capsulatus (Bath) was also able to remediate hexavalent chromium contamination. In the current study sediment samples were enriched from an urban river in Sheffield in Northern England that has previously suffered serious heavy metal pollution due to previous activity of the steel industry …
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Environmentally friendly corrosion resistant coatings as alternatives for cadmium and chromium in the aerospace industry
… of the toxic and carcinogenic cadmium and hexavalent chromium coatings currently being employed for corrosion protection of ultra-high strength steel and other aviation components. A powdered aluminium alloy containing 12 mass % manganese, applied with atmospheric plasma spraying, were …
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Analytical methods to investigate occupational exposure to toxic elements and their species
… occupational concern, i.e. inorganic arsenic, hexavalent chromium and respirable crystalline silica (RCS). Current biological monitoring methods are either no longer deemed fit for purpose (arsenic), not ideal (chromium) or are not available (RCS). The limitations of occupational exposure …
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Surface chemistry design and characterization of anion exchange and activated carbon fibers for critical contaminants removal
… functional groups. In the study of adsorption of hexavalent chromium, HACAX shows excellent kinetics, selectivity and regeneration efficiency towards Cr (VI). Combined with rich surface oxygen functional groups, this material provides a pathway to adsorb and convert Cr(VI) into Cr(III) at natural …
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Investigation of electroless nickel undercoat for duplex nickel chromium electrodeposition onto aluminium and its alloys
… then zinc is deposited followed by nickel and chromium electrodeposition. Superior adhesion was associated with uniform, thin and fine grained deposits from Bondal solution which exhibited rapid and complete coverage of both aluminium samples. The metallurgical characteristics of the aluminium …
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