Record Display for the EPA National Library Catalog
RECORD NUMBER: 38 OF 46| Main Title | Sorption, Important in Stabilized/Solidified Waste Forms. | |||||||||||
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| Author | Cheng, K. Y. ; Bishop., P. L. ; | |||||||||||
| CORP Author | Dames and Moore, Cincinnati, OH. ;Cincinnati Univ., OH. Dept. of Civil and Environmental Engineering.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. | |||||||||||
| Publisher | c1994 | |||||||||||
| Year Published | 1994 | |||||||||||
| Report Number | EPA/600/J-94/140; | |||||||||||
| Stock Number | PB94-155256 | |||||||||||
| Additional Subjects | Sorption ; Waste treatment ; Solidification ; Stabilization ; Superfund ; Technology utilization ; Best technology ; Hazardous materials ; Portland cement type 1 ; Solid waste disposal ; Leaching ; Heavy metals ; Lead ; Arsenic ; Cadmium ; Reprint ; Remedial action ; Stabilized/solidified waste | |||||||||||
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| Collation | 11p | |||||||||||
| Abstract | Sorption is one of the important fixation mechanisms of metals in stabilized/solidified waste forms. In the present work, the sorption-desorption processes active in cement-based waste forms in acetic acid solutions were investigated. Experimental results indicated that the extent of sorption of a metal ion was strongly pH dependent. Cement-based waste forms had similar sorption characteristics as amphorous silica gel. The pH of the sorption edge is 5 to 6.5 for Pb(2+) and As(3+), 6 to 8.5 for Cd(2+), and 8 to 12 for Ca(2+). In addition, almost 90% of the lead and cadmium were leachable at pH 4.5, while nearly 30% of arsenic remained unleached at the same pH. (Copyright (c) Hazardous Waste and Hazardous Materials 1992.) |