论文信息 - Deposition of Persistent Organic Pollutants Over Europe

Deposition of Persistent Organic Pollutants Over Europe

Persistent Organic Pollutants (POPs) are compounds that are resistant to photolytic, biological, and chemical degradation. Due to this persistence these pollutants accumulate in the environment and food chains of humans and animals, where they can induce toxic effects (UN-ECE, 1994). POPs originate to a large extent from anthropogenic activities. Examples of POPs are: pesticides (DDT, hexachlorocyclohexane HCH), and industrial (by-) products (PCB. PAH, Dioxins). Many POPs are semi-volatile at atmospheric conditions. Because of these characteristics POPs have an atmospheric lifetime of several weeks or more and are subject to long-range atmospheric transport. During this transport POPs are deposited but for the more volatile POPs a re-emission from soil and water surfaces might occur. For this reason the description of the deposition process generally used for components only depositing, such as most acidifying components and heavy metals, cannot be applied. Hence, the deposition should be considered as the sum of the deposition and re-emission fluxes, or in other words, as a net-deposition flux. In terms of effects, this net deposition of POP in the environment is a more relevant quantity.

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