TRANSPORT OF DISSOLVED ORGANIC CARBON-DERIVED NATURAL COLLOIDS FROM BED SEDIMENTS TO OVERLYING WATER - LABORATORY SIMULATIONS

被引：21

作者：

VALSARAJ, KT

THOMA, GJ

PORTER, CL

REIBLE, DD

THIBODEAUX, LJ

机构：

来源：

WATER SCIENCE AND TECHNOLOGY | 1993年 / 28卷 / 8-9期

关键词：

COLLOID; FACILITATED TRANSPORT; DISSOLVED ORGANIC CARBON; MATHEMATICAL MODEL; CONTAMINATED SEDIMENT; DIFFUSIVE EXCHANGE;

D O I：

10.2166/wst.1993.0612

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Natural colloids are part of the carbon cycle arising from sediment diagenesis. Natural colloids can be quantified as the dissolved organic carbon (DOC) present in the pore-water of sediment beds. In this paper we demonstrate that DOC is mobile in a system in which the dominant transport mechanism is Brownian diffusion. A simple model which assumes constant physico-chemical properties for the DOC adequately predicts the DOC release rate from a sediment bed in a microcosm. A single adjustable parameter, the water diffusivity, is used to fit the model to the experimental data. The experimental diffusivities obtained from the fitted data agree well with previously presented values.

引用

页码：139 / 147

页数：9

共 21 条

[1] INFLUENCE OF COLLOIDS ON SEDIMENT WATER PARTITION-COEFFICIENTS OF POLYCHLOROBIPHENYL CONGENERS IN NATURAL-WATERS [J].