SORPTION, IMPORTANT IN STABILIZED SOLIDIFIED WASTE FORMS

被引：22

作者：

CHENG, KY ^{[1
]}

BISHOP, PL ^{[1
]}

机构：

[1] UNIV CINCINNATI,DEPT CIVIL & ENVIRONM ENGN,CINCINNATI,OH 45221

来源：

HAZARDOUS WASTE & HAZARDOUS MATERIALS | 1992年 / 9卷 / 03期

关键词：

D O I：

10.1089/hwm.1992.9.289

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 Pb2+ and As3+, 6 to 8.5 for Cd2+, and 8 to 12 for Ca2+. 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.

引用

页码：289 / 296

页数：8