The maximum reservoir capacity of soils for persistent organic pollutants: implications for global cycling

被引:88
作者
Dalla Valle, M
Jurado, E
Dachs, J
Sweetman, AJ
Jones, KC [1 ]
机构
[1] Univ Lancaster, Dept Environm Sci, Lancaster LA1 4YQ, England
[2] CSIC, IIQAB, Dept Environm Chem, ES-08034 Barcelona, Spain
关键词
POPs; global cycling; modelling;
D O I
10.1016/j.envpol.2004.07.011
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The concept of maximum reservoir capacity (MRC), the ratio of the capacities of the surface soil and of the atmospheric mixed layer (AML) to hold chemical under equilibrium conditions, is applied to selected persistent organic pollutants (POPs) in the surface 'skin' (1 mm) of soils. MRC is calculated as a function of soil organic matter (SOM) content and temperature-dependent K(OA) and mapped globally for selected PCB congeners (PCB-28; -153; -180) and HCB, to identify regions with a higher tendency to retain POPs. It is shown to vary over many orders of magnitude, between compounds, locations and time (seasonally/diurnally). The MRC approach emphasises the very large capacity of soils as a storage compartment for POPs. The theoretical MRC concept is compared to reality and its implications for the global cycling of POPs are discussed. Sharp gradients in soil MRC can exist in mountainous areas and between the land and ocean. Exchanges between oceans and land masses via the atmosphere is likely to be an important driver to the global cycling of these compounds, and net ocean-land transfers could occur in some areas. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:153 / 164
页数:12
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