Persistent

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Definition of Persistent:
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 supstance 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

References

  1. ↑ OSPAR CONVENTION 2005, Cut-Off Values for the Selection Criteria of the OSPAR Dynamic Selection and Prioritisation Mechanism for Hazardous Substances
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