sunnudagur, 18. nóvember 2018
TölublöðVenjuleg útgáfa

Reason to be cautious

23. mars 2010 kl. 22:09

Reason to be cautious

The Food Institute has published information on their website where one can read about the conclusions from the fluorine measurements of the ash coming from Eyjafjallajökull. According to the information from the Institute of Earth Sciences, the amount of fluorine is not that much, or about a third of what normally comes in the ash in mount Hekla, but similar to the eruption in Vestmannaeyjar Islands in the year 1973. Still there is good reason to be cautious and to keep livestock from contaminated field with ash and not least from puddles of water on the ground.

Further on the samples implemented yesterday, March 22nd:

Three samples were measured:
1.    Samples from the volcano – fine glazed slag
2.    Samples of snow from under the Eyjafjalla mountains VP323 at 63.36.36,4-19.26.17,3- glazed ash 0,2-1mm
3.    Same place as Nr 2

Sample nr one was rinsed at the laboratory and both fluorine and the amount of acidity measured in water.
Fluorine and acidity was measured in water melted from snow from samples 2 and 3.

Solvable fluorine coming from the top layer of ash: mg fluorine pr kg of ash.
•    Sample 1(pH 6,45) fluorine  92 mg/kg
•    Sample 2 (pH 5.66) fluorine 112 mg/kg
•    Sample 3 (pH 5,55) fluorine 108 mg/kg

The water is a little sour – pointing towards small amounts of volcanic gas (hydrochloric acid-sulphuric acid) on the grain of ash.

Attention – samples come from course ash – it must be taken into account that farther away from the volcano the amount of fluorine is greater and the ash is finer with a larger surface. It is possible that the relevancy is up to 400-500 mg/kg in the southern (center) part of the country.