期刊
SOIL SCIENCE
卷 165, 期 2, 页码 99-108出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00010694-200002000-00001
关键词
gas adsorption; surface area; microporosity; soils; soil organic matter; particle size separates; sorption
类别
Microporous properties of son materials are considered important to the physical sequestration processes of contaminants and the influence on risk assessment for chemicals in the environment. We studied the microporous properties of live organic soil materials and two agricultural topsoils and their size separates. The methods used were gas adsorption with N-2, CO2, C2H6, C2H4, and C2H2, as well as retention of the polar Liquid EGME (ethylene-glycol-dimethyl-ether). Measured surface areas and micropore volumes determined with gas adsorption. were strongly dependent on the molecular dimensions of the adsorbent, revealing that dried organic and mineral soil materials behave Like rigid structures in the micropore range. A precipitated humic acid behaved differently, revealing a more open and/or homogeneous micropore structure. The EGME-derived surface areas of organic soil materials had a magnitude similar to the CO2-derived surface areas. The microporous structure of the more rigid soil organic matter (SOM) materials does not seem to be affected strongly by EGME penetration. The SOM rigidity seems to be positively correlated to SOM polarity and negatively correlated to sorption coefficients of naphthalene under wet conditions. The surface areas of mineral soils and size-separates measured with CO, and EGME were of comparable size in the absence of swelling clay minerals.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据