Global ETD Search
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Showing 1 to 7 of 7 for “"Trivalent Chromium"”.
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Corrosion protection mechanisms of trivalent chromium based passivations on γ-ZnNi coated Al6061-T6 alloy
<p>“The role of cobalt in trivalent chromium passivations (TCPs) to improve corrosion resistance of γ-ZnNi coated steel and aluminum is based on its effect on hexavalent chromium content in the passive layer. Investigations of both a cobalt-containing and cobalt-free TCP on SAE 1008 steel indicated …
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Studies on the analytical chemistry of chromium in aqueous solutions
… of the various oxidation states of chromium by coprecipitation and preconcentration of trivalent chromium in aqueous solutions using iron(III) hydroxide as the coprecipitating agent has been studied. Recoveries of trivalent chromium are less than 100% because of formation of …
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Measurement of inorganic arsenic and chromium species in southern Nevada groundwater using ion chromatography-inductively coupled plasma mass spectrometry
… to separate inorganic 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 …
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Speciation and microbial transformation of chromium, arsenic and mercury in municipal landfill leachate
… not regulated by waste disposal guidelines. Chromium, arsenic and mercury speciation were investigated in municipal landfill leachate (MLL) to evaluate microbial transformation of the heavy metals in the landfill system. MLL is a complex matrix that contains multiple inorganic and organic …
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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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Absorption of Chromium Across the Rat Small Intestine
Chromium is an essential element in trace quantities, but toxic at high concentrations, particularly in the hexavalent form. In this study the transport of physiological non-toxic amounts of trivalent chromium across different regions of rat small intestine was investigated using the everted sac …
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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 …