Fróðskaparrit - 01.07.2004, Side 127

Fróðskaparrit - 01.07.2004, Side 127
KYKSILVUR í FØROYUM - EIN GJØGNUMGONGD AV TØKUM DÁTUM 125 Fig. 18 Mercury in grey seal muscle, in mg/kg, in samples taken around the Faroe Islands 1993-1995. The regression line based on thefemale results is sliown (Adaptedfrom Dam et. al„ 2001). were however much lower than in the Faroese ones, with concentration of 0,5 mg/kg (range 0,3-1,1) and 2,5 mg/kg (range 0,9-4,1) respectively. Discussion In the present paper the available informa- tion on mercury concentration in the Faroese environment is reviewed, and mer- cury concentration from matrices in the at- mospheric compartment, the terrestrial freshwater compartment and the marine en- vironment has been described. When avail- able, data on similar matrices in neighbour countries or in countries from which com- parable data has been recently published, are discussed for comparison. The overall purpose of the review is to gather mercury data so as to be able to discern where ele- vated concentrations occur and if possible also to elucidate the question of sources. The studies undertaken on atmospheric transport of mercury to the Faroes and the results of the European moss metal survey do not indicate elevated mercury input to the terrestrial environment above what is seen in for instance the Scandinavian coun- tries. This may be supported also by obser- vations that mercury in sheep was low, and not detected at 0,02 mg/kg. A bit puzzling then, is the finding of somewhat elevated mercury concentrations in hare livers, as these two grazers would have the same food source. Also, the analyses of mercury in soil (incl. peat) and freshwater físh like Artic char in particular, do indicate high concen- trations of mercury in the soil and in the freshwater system. It should be recalled in this context though, that concentration is not just a question of the amount of soluble material that is put into a system, it is just as much a question of what volume this system has available for diluting the mater- ial. This must be kept in mind when evalu- ating the concentration of mercury in the Leynavatn Arctic char samples, but it may also be of relevance to the mercury in soil and sediment concentration, such that low yearly increments in “dilution mass” will result in relatively high concentrations even when the deposit or intake was not elevat- ed. Also, it may be speculated whether the moderate temperatures and high humidity
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