CHANGE IN PCB (CLOPHEN-A-50) COMPOSITION WHEN TRANSPORTED FROM SEDIMENT TO AIR IN AQUATIC MODEL SYSTEMS

被引:15
作者
LARSSON, P
机构
[1] Institute of Limnology, University of Lund, Box 3060, S-220 03 Lund, Sweden
来源
ENVIRONMENTAL POLLUTION SERIES B-CHEMICAL AND PHYSICAL | 1985年 / 9卷 / 02期
关键词
AIR POLLUTION - WATER POLLUTION - Sedimentation;
D O I
10.1016/0143-148X(85)90025-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
PCBs (Clophen A 50) were added to the sediment of laboratory model systems composed of sediment, water, benthic macroinvertebrates and fish. Part of the PCBs left the sediment and a concentration of 0. 2-0. 7 mu g litre** minus **1 was obtained in the water. The transport of PCBs from water to air includes at least two processes: volatilization and jet drop transport. Volatilization resulted in a transport of 0. 2-1. 0 mu g PCBs a week to air. Less chlorinated PCBs, i. e. tetrachlorobiphenyls, were transported to the air to a greater extent than more chlorine-substituted PCBs. Transport of PCBs by jet drops from bursting bubbles was of the same magnitude as volatilization, but the proportion of PCB compounds trapped by the impactor plates was identical with that of sediment and water. The results suggest that the contaminated sediment of lakes and watercourses may act as a source of PCBs to the atmosphere. Refs.
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页码:81 / 94
页数:14
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