Determination of cadmium in sewage sludge by differential pulse anodic stripping voltammetry.
A procedure was developed for the determination of cadmium in sewage sludge by differential pulse anodic stripping voltammetry. A sodium peroxide fusion carried out in zirconium crucibles was found to give satisfactory results, based on analysis of standard reference materials. Samples collected from the municipal sludge lagoon in Fort Wayne, Indiana were found to have cadmium abundances ranging from 120 to 250 ppm, with most samples falling in the 120 to 170 ppm range. Interference from zinc is easily eliminated by carrying out the deposition step at -0.95 V vs. Ag/AgCl. Lead-to-cadmium ratios as high as 50:1 (ppm basis) have no effect on the height of the cadmium peak.
Pacer
R A
RA
Department of Chemistry, Indiana University-Purdue University Fort Wayne, Fort Wayne, IN 46805-1499, USA. pacer@ipfw.edu
Scott Ellis
C K
CK
Peng
R
R