Soot sorption of non-ortho and ortho substituted PCBs

被引:106
作者
Bucheli, TD [1 ]
Gustafsson, Ö [1 ]
机构
[1] Univ Stockholm, ITM, Inst Appl Environm Res, S-10691 Stockholm, Sweden
关键词
black carbon; organic contaminants; planarity; sediments; soils;
D O I
10.1016/S0045-6535(03)00508-3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Field-observations of distribution coefficients well above expectations from bulk organic-matter partitioning for several chlorinated aromatic compound classes have lead to the hypothesis that enhanced affinity to soot may not be limited to polycyclic aromatic hydrocarbons but may extend as a significant process for a wider range of hydrophobic organic compounds. This suggestion was here tested in soot-column sorption experiments with a series of ortho- and non-ortho substituted polychlorinated biphenyls (PCBs), using diesel particulate matter (NIST standard reference material SRM-1650) as model soot sorbent. For congeners of similar hydrophobicity, considerably higher affinities toward the soot sorbent were observed for the non-ortho substituted PCBs. Mono- to tetra-ortho substituted PCBs exhibited log-based soot-water distribution coefficients (K-sc) from 5.25 to 5.51 l/kg(sc) at solute concentrations corresponding to 1-13 mug/l. In contrast, biphenyl, mono- and dichloro- non-ortho substituted PCBs yielded log K-sc values between 5.09 and 6.35 l/kg(sc). These results are 20-50, and 75-110 times higher, respectively, than the corresponding predicted K-oc numbers. This strong interaction with soot, particularly of non-ortho substituted PCBs, may fundamentally affect their environmental distribution and bioavailable exposure. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:515 / 522
页数:8
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