BACKGROUND We report a case of a spray painter who developed malignant fibrous histiocytoma (MFH) of the maxillary sinus following long-term exposure to chromium, nickel, and formaldehyde, implying that these agents are probable causal agents of MFH. CASE REPORT The patient developed right-sided prosopalgia that began twenty months ago. The symptom persisted despite medical treatment. After t...

Hexavalent chromium compounds exhibit higher toxicity than its trivalent compounds since chromium ions in the +6 oxidation state easily cross biological membranes. It has recently been proposed that substances reducing chromium ions from the +6 to the less toxic +3 oxidation state can be beneficial in management of acute chromium poisoning. In vitro studies also demonstrated quercetin-5 '-sulfo...

a chromium electroplating bath with the ability to produce homogenous mist was used to evaluate parameters influencing hexavalent chromium (cr+6) mist sampling methods. the results of 48 cr+6mist samples collected using the u.s. national institute for occupational safety and health method 7600showed that cr+6concentration was higher: (1) for sampling by closed-face filter cassettes than for sam...

(w ww .m ed kn ow .co m) . shoes and to the inner surface of the sandal strap of the third volunteer. The pieces were left in place for one week during which period, the volunteers used the shoes routinely. A small piece of leather 1 x 1 cm in size was removed after one week from each of the six pieces and subjected to spot testing with DPC. Of these six pieces of leather, all the leather piece...

Chromium occurs mostly in tri- and hexavalent states in the environment. Hexavalent chromium [Cr(VI)] compounds are extensively used in diverse industries, and trivalent chromium [Cr(III)] salts are used as micronutrients and dietary supplements. In the present work, we report that they both induce genetic mutations in yeast cells. They both also cause DNA damage in both yeast and Jurkat cells ...

Adsorption of hexavalent chromium [Cr(VI)] onto a loamy sand soil was studied using batch and steady flow tests with contaminant solutions at pH 2, 5 and 7. In all the cases the adsorption of Cr(VI) decreased with increasing pH. The hexavalent chromium speciation and its presence as different oxyanions, according to the solution pH, were the main variables affecting the adsorption process. The ...

101 CHARACTERIZATION OF CHROMIUM(VI) BIOREDUCTION AND CHROMIUM(III) BINDING TO ALFALFA BIOMASS K. Dokken, G. Gamez, I. Herrera, K.J. Tiemann, N.E. Pingitore, R.R. Chianelli, and J.L. Gardea-Torresdey Department of Chemistry and Environmental Science and Engineering,University of Texas at El Paso, El Paso, TX 79968; Phone: (915) 747-5359; Fax: (915) 747-5847. Department of Geological Sciences, U...

The capabilities of a “universal platform” for the deployment of analytical sensors in the field for long-term monitoring of environmental contaminants were expanded in this investigation. The platform was previously used to monitor trichloroethene in monitoring wells and at groundwater treatment systems (1,2). The platform was interfaced with chromium (VI) and conductivity analytical systems t...