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persistent substance

persistent and very persistent substances are which persist in the environment for a long time. The cause for that is, that the substance is not degradable by light or other radiation, heat, oxygen, water or moisture nor on biological effects. Many of the xenobiotics are designed to be persistent in the environment (similar to drugs in the body), otherwise the amount to be applied and as a consequence the cost of the substance would be very high, while the efficiency , due to too short contact-time and not stable concentration would be limited.

Hazard and persistency together increase the risk of the substance, given as ecosystem or humans are exposed for longer time to the substance, so it has higher chance to effectuate its harm.

According to REACH regulation substance fulfils the persistence criterion when:
– the half-life in marine water is higher than 60 days, or
– the half-life in fresh- or estuarine water is higher than 40 days, or
– the half-life in marine sediment is higher than 180 days, or
– the half-life in fresh- or estuarine water sediment is higher than 120 days, or
– the half-life in soil is higher than 120 days.

Persistent, Bioaccumulative, Toxic (PBT)

Annex XIII of REACH defines criteria for the identification of substances that are Persistent, Bio-accumulative and Toxic (PBTs) and Annex I lays down general provisions for PBT assessment. PBTs are substances of very high concern (SVHC) and may be included in Annex XIV and by that be made subject to authorisation (Source: REACH)

Persistent, Bioaccumulative, Toxic Substances (PBT)
Annex XIII of REACH defines criteria for the identification of substances that are Persistent, Bio-accumulative and Toxic (PBTs) and Annex I lays down general provisions for PBT assessment. PBTs are substances of very high concern (SVHC) and may be included in Annex XIV and by that be made subject to authorisation (Source: REACH)
very persistent

according to REACH regulation a substance fulfils the very persistent criterion when:
– the half-life in marine, fresh- or estuarine water is higher than 60 days, or
– the half-life in marine, fresh- or estuarine water sediment is higher than 180 days, or
– the half-life in soil is higher than 180.

See also: persistent substance and very Persistent and very Bioccumulative Substances

very Persistent and very Bioccumulative Substances, vPvB

substances of very high concern, which are very persistent (very difficult to break down) and very bio-accumulative in living organisms. Annex XIII defines criteria for the identification of vPvBs and Annex I lays down general provisions for their assessment. vPvBs may be included in Annex XIV and by that be made subject to authorisation. (Source: REACH Glossary)