Change in PCB (Clophen A 50) composition when transported from sediment to air in aquatic model systems

Environmental Pollution Series B, Chemical and Physical Pub Date : 1985-01-01 DOI:10.1016/0143-148X(85)90025-4

Per Larsson

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引用次数: 14

Abstract

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 μg litre⁻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 (as indicated by PCBs trapped on polyurethane foam filters) resulted in a transport of 0·2–1·0 μg 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 (as indicated by the amount of PCBs found on jet drop impactors) 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 process seems mainly to transfer PCBs containing bulk water and particles to the air.

The results suggest that the contaminated sediment of lakes and watercourses may act as a source of PCBs to the atmosphere.

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在水生模型系统中，多氯联苯(氯酚A 50)从沉积物输送到空气时组成的变化

在由沉积物、水、底栖大型无脊椎动物和鱼类组成的实验室模型系统的沉积物中添加多氯联苯(Clophen a50)。部分多氯联苯离开沉积物，水体中多氯联苯浓度为0.2 ~ 0.7 μg l−1。多氯联苯从水中到空气的迁移至少包括两个过程:挥发和喷射滴迁移。挥发(通过捕获在聚氨酯泡沫过滤器上的多氯联苯表示)导致每周向空气中输送0.2 - 1 μg的多氯联苯。较少氯化的多氯联苯，即四氯联苯，比较多氯取代的多氯联苯更大程度地被输送到空气中。从破裂的气泡中喷射出的多氯联苯(由喷射出的撞击器中发现的多氯联苯的数量表明)与挥发量相同，但撞击板捕获的多氯联苯化合物的比例与沉积物和水的比例相同。这个过程似乎主要是将含有大量水和颗粒的多氯联苯转移到空气中。结果表明，湖泊和水道的污染沉积物可能是大气中多氯联苯的来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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