Difference between revisions of "Persistent"
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Definition|title= Persistent | Definition|title= Persistent | ||
| − | |definition= 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>}} | + | |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>}} |
==References== | ==References== | ||
Revision as of 11:02, 23 September 2009
Definition of Persistent:
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 toxicity. According to OSPAR criteria a substance is considered to pesist in the marine environment when has a half-life above 50 days. [1]
This is the common definition for Persistent, other definitions can be discussed in the article
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