NONEQUILIBRIUM SORPTION OF ORGANIC-CHEMICALS - ELUCIDATION OF RATE-LIMITING PROCESSES

被引：423

作者：

BRUSSEAU, ML ^{[1
]}

JESSUP, RE ^{[1
]}

RAO, PSC ^{[1
]}

机构：

[1] UNIV FLORIDA,DEPT SOIL SCI,GAINESVILLE,FL 32611

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1991年 / 25卷 / 01期

关键词：

D O I：

10.1021/es00013a015

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The results of experiments designed to identify the process(es) responsible for nonequilibrium sorption of hydrophobic organic chemicals (HOCs) by natural sorbents are reported. The results of experiments performed with natural sorbents were compared to rate data obtained from systems wherein rate-limited sorption was caused by specific sorbate-sorbent interactions. This comparison showed that chemical nonequilibrium associated with specific sorbate-sorbent interactions does not significantly contribute to the rate-limited sorption of HOCs by natural sorbents. Transport-related nonequilibrium was also shown to not be a factor for the systems investigated. Hence, attempts were made to interpret the data in terms of two, sorption-related, diffusive mass-transfer conceptual models: retarded intraparticle diffusion and intraorganic matter diffusion. The analyses provide strong evidence that intraorganic matter diffusion was responsible for the nonequilibrium sorption exhibited by the systems investigated in this paper.

引用

页码：134 / 142

页数：9

共 68 条

[21] PHYSICAL CONCEPT OF SOIL-WATER EQUILIBRIA FOR NON-IONIC ORGANIC-COMPOUNDS [J].