Difference between revisions of "Persistent"

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Definition|title= Persistent
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Definition|title= persistent
|definition= A substance is persistent when it's only slowly degraded from the environment. Persistency is one of 3 important criteria used to asses the environmental impact of a chemical substance. The other 2 are [[bioaccumulation]] and [[toxic|toxicity]]. According to OSPAR criteria a substance is considered to pesist in the marine environment when has a [[half-life]] above 50 days. <ref>[http://www.ospar.org/documents/dbase/decrecs/agreements/05-09e_Cut-off-value%20agreement.doc OSPAR CONVENTION 2005, Cut-Off Values for the Selection Criteria of the OSPAR Dynamic Selection and Prioritisation Mechanism for Hazardous Substances ]</ref>}}
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|definition= The persistence of a substance reflects the potential for the substance to reach the marine environment and to be transported to remote areas as well as the potential for long-term exposure of organisms. <ref name = d>[http://www.ospar.org/documents/dbase/decrecs/agreements/05-09e_Cut-off-value%20agreement.doc OSPAR CONVENTION 2005, Cut-Off Values for the Selection Criteria of the OSPAR Dynamic Selection and Prioritisation Mechanism for Hazardous Substances ]</ref>}}
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===Notes===
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Persistence is one of 3 important criteria used to asses the environmental impact of a chemical substance. The other 2 are [[bioaccumulation]] and [[toxic|toxicity]]. According to OSPAR criteria a substance should be considered persistent, if it is likely to end up in the marine environment with a [[half-life]] above 50 days. <ref name = d> [http://www.ospar.org/documents/dbase/decrecs/agreements/05-09e_Cut-off-value%20agreement.doc OSPAR CONVENTION 2005, Cut-Off Values for the Selection Criteria of the OSPAR Dynamic Selection and Prioritisation Mechanism for Hazardous Substances ]</ref>
  
 
==References==
 
==References==

Revision as of 11:22, 23 September 2009

Definition of persistent:
The persistence of a substance reflects the potential for the substance to reach the marine environment and to be transported to remote areas as well as the potential for long-term exposure of organisms. [1]
This is the common definition for persistent, other definitions can be discussed in the article

Notes

Persistence is one of 3 important criteria used to asses the environmental impact of a chemical substance. The other 2 are bioaccumulation and toxicity. According to OSPAR criteria a substance should be considered persistent, if it is likely to end up in the marine environment with a half-life above 50 days. [1]

References