Field measurements of PCB partitioning between water and planktonic organisms: Influence of growth, particle size, and solute-solvent interactions

被引:65
作者
Axelman, J [1 ]
Broman, D [1 ]
Naf, C [1 ]
机构
[1] UNIV STOCKHOLM,INST APPL ENVIRONM RES,S-10691 STOCKHOLM,SWEDEN
关键词
D O I
10.1021/es960088+
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Due to long equilibration times, growth of planktonic organisms significantly dilutes cell concentrations of adsorbed highly hydrophobic organic compounds(HOCs). Behavior of polychlorinated biphenyls (PCBs) in field samples of 0.2-2, 2-25, and >100 mu m particle size fractions confirmed this. The in-situ log K-oc values showed a near linear relationship with hydrophobicity (log K-ow) with a slope of 1.2 for the 0.2-2 mu m size fraction, whereas the in-situ log K-oc values remained within 1 log unit throughout the entire log K-oc interval for the 2-25 mu m size fraction. In the largest size fraction, there was a weak positive relationship between log K-oc and log K-ow with a linear regression slope of 0.28. The results imply that equilibrium concentrations in planktonic organisms cannot be used in food chain modeling. Observed high equilibrium log K-oc values relative to log K-ow values are discussed in terms of solute-solvent interactions in the octanol-water system as opposed to the organic carbon-water system in the field.
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页码:665 / 669
页数:5
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