Reinterpreting literature sorption data considering both absorption into organic carbon and adsorption onto black carbon

被引：225

作者：

Accardi-Dey, A ^{[1
]}

Gschwend, PM ^{[1
]}

机构：

[1] MIT, Ralph M Parsons Lab, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2003年 / 37卷 / 01期

关键词：

D O I：

10.1021/es020569v

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We hypothesized that the sorption of polycyclic aromatic hydrocarbons (PAHs) to natural sediments and soils should consider both absorption into a biogenic/diagenetic organic carbon (OC) fraction and adsorption onto a combustion-derived, black carbon (BC) fraction. Here, two sets of literature data were reevaluated to illustrate that an OC absorbent and a BC adsorbent together can (1) account for sediment-pore-water distribution coefficients observed in the field that are greater than predicted by a simple f(oc)K(oc) partitioning model and (2) explain a group of nonlinear phenanthrene isotherms observed in the laboratory with a single value for the BC-normalized distribution coefficient (log K-BC = 6.1 +/- 0.04) and a Freundlich exponent (n approximate to 0.6 if log K-oc = 4.0) that is strongly dependent on the K-oc value selected.

引用

页码：99 / 106

页数：8

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