Volcanic ash cloud – update 7
EXT01 – B05
The Scottish Environment Protection Agency (SEPA) is continuing
to monitor the situation regarding the volcanic ash cloud currently
affecting the UK and its possible impact on Scotland's
environment.
Rainfall/snowmelt
Within the last week we have received 37 samples from a network
of 39 rainfall sites. In total we have now analysed 76 rainfall
samples. Nothing of concern has emerged from the preliminary
results.
One ad hoc sample was taken in South Harris yesterday and is
being shipped to a SEPA laboratory for analysis.
Dust
Six dust samplers have been deployed to assess deposition rates.
Another four due to be deployed soon giving a network across the
country similar to that in place for rainfall. The deposition
measurement cannot distinguish between volcanic ash and other forms
of dust e.g. particles from industrial processes, domestic heating
processes, soil, road transport etc., but these can be assessed
visually in the laboratory. The current deposition rates are one
third of the rate which in normal SEPA business would cause us to
consider further investigation.
Automated samplers, which assess particle concentrations in the
atmosphere, are operational in Dalgety Bay, St Boswells and
Hunterston. These and other real time devices confirm that levels
remain low and below relevant air quality standards.
Eight combined dust and water samples have been analysed for 20
key determinands and have shown no cause for concern.
Herbage
A total of 30 grass samples have been taken from 10 sites and
analysed for fluoride deposits. All were below detection
limits.
SEPA is continuing to be involved in multi-agency meetings with
the Met Office, Health Protection Scotland and the Food Standards
Agency.
Further updates will be published as soon as they become
available.