The influence of chromium on the microbial community structure was analyzed in a river system subjected to long-term chromium contamination, by plating and by sequencing 16S rRNA genes cloned from DNA extracted from the river sediments. We also analyzed the influence of chromium on the ability of the microbial community to resist and reduce Cr(VI) and on its resistance to antibiotics. Shifts in...

in this study, taguchi experimental design has been used for the optimization of thickness of chromium layers. for this purpose brass materials have been electroplated under various conditions of the process. an orthogonal array (oa) was employed to analyze the effect of plating parameters on the characteristic of the thickness. variables which were considered for working were as following; amo...

Effects of hydrogen on the structure of electrodeposited Cr films have been investigated by combining X-ray diffraction and thermal desorption spectroscopy, systematically varying the plating conditions. A large amount of hydrogen was dissolved at high current densities in a Cr-rich bath at low temperatures, and caused structural changes from bcc to hcp and fcc hydrides with increasing hydrogen...

High levels of potentially leachable toxic metals such as Pb, Cd, and Cr, in the ash residues require consideration of treatment technologies prior to disposal or utilization of the ashes in other applications. Extraction studies revealed information on the leaching characteristics of the ashes and on the ability of the extraction solutions to separate these metals from the ash matrix. The kine...