We have studied metallic and oxidized chromium layers on thin ordered alumina films grown on a NiAl~110! substrate using x-ray photoelectron spectroscopy. The interaction between the chromium layers and the substrate has been characterized after deposition at room temperature and after oxidation at 300 and 700 K. Our results indicate partial oxidation of the deposited chromium with the fraction...

Heavy metal, chromium (VI) removal by coagulation using natural coagulant material was investigated in this paper. Chromium occurs naturally in the paint manufacturing industry waste water in many steps of the process. The coagulation and flocculation method is used for chromium removal from waste water using fruits of Opuntia Ficus indica, Fruits of Jatropha gossypifolia and peel of Borassus f...

Chromium has been recognized as an essential nutrient in humans for many years (Mertz, 1992). Though chromium may well be involved in other physiological processes, at present its only known role is as a component of glucose tolerance factor (GTF) which potentiates the action of insulin. Therefore, it is involved in carbohydrate metabolism and other insulin dependent processes such as protein a...

This experiment was conducted to determine the ef®cacy of feeding chromium yeast to growing beef steers. Animal growth, gain ef®ciency, and blood glucose kinetics were determined in 24 beef steers (initial body weightˆ253 4 kg) fed a corn silage-based diet supplemented with 0 (control), 100, 200, or 400 mg chromium from high-chromium yeast/kg of diet dry matter. Intravenous glucose tolerance te...

The determination of chromium(VI) at high concentrations can be performed spectrophotometrically with 1,5-diphenylcarbazite. The standard determination methods for chromium(VI) in leather like DIN53314 or IUC 18 have a detection limit of 3mg/kg leather. However the detection limit is not enough for lower concentrations. There is a need for lower detection limits because public awareness of hexa...

Corrosion is the degradation or deterioration of metal components due to a reaction with the environment. Chromate conversion coating is applied to passivate metallic surface to slow down (and prevent to some extent) corrosion process. Chromate conversion process uses chromium compounds including hexavalent chromium, which is toxic, carcinogenic and hazardous to human health and environment. He...

Purpose: To determine whether chromium, cadmium, and lead levels in human Fingernails reflected the exposure to workplace contamination in tanneries. Approach: 49 exposed tanning workers and 33 controls were monitored for fingernail levels of chromium, cadmium, and lead by graphite furnace and hydride atomic absorption spectroscopy. Results: The mean levels of fingernail chromium, cadmium, and ...

D espite widespread use by patients with diabetes and anecdotal reports in the past regarding its efficacy, until recently, data in humans concerning chromium’s effects on insulin action in vivo or on cellular aspects of insulin action were scarce. Consequently, significant controversy still exists regarding the effect of chromium supplementation on parameters assessing human health. Furthermor...

Volume Seven 1-1 ABSTRACT The removal of chromium, a highly toxic metal causing environmental pollution from dilute aqueous solution, was studied in the present work using growing and washed cells of a mutant strain of Bacillus cereus (M16) isolated from tannery waste. Particularly, the effects of pH, temperature, metal ion concentration and contact time on removal of chromium were studied. Abo...

The surface modification processes such as hard facing, case carburizing, thermal spraying, ion nitriding, tough nitriding, and others, are some of the important techniques being adopted for providing enhanced life for parts and components, in service. Among them, plasma spray and High Velocity Oxy Fuel (HVOF) spray coatings are popular and widely used. In this investigation, plasma & High Velo...