Fróðskaparrit - 01.07.2004, Side 95

Fróðskaparrit - 01.07.2004, Side 95
KYKSILVUR í FØROYUM - EIN GJØGNUMGONGD AV TØKUM DÁTUM 93 Cd Cr Cu Fe Ni Pb V Zn Hg Hylocomium s. 1996 1,2 0,12 0,73 5,43 539 1,53 7,58 4,45 15,17 Average all locations, range 0,09-0,15 0,49-1,17 4,44-6,92 312-1064 1,19-1,91 5,37-10,3 3,21-6,84 12,0-21,6 Hylocomium s. 1996' 0,13 0,51 5,67 382 1,45 7,38 3,43 16,9 Hylocomium s. 2000 1 q 0,86 6,88 812 1,78 3,78 3,98 15,06 0,05 Average all locations, range 0,04-0,09 0,50-1,83 4,48-9,87 270-1755 1,02-2,97 2,18-5,94 1,81-8,03 10,7-20,3 0,02-0,07 Hylocomium s. 20001 0,05 0,54 7,21 878 1,95 3,67 2,50 13,7 0,05 Racomitrium lanuginosum 0,07 2,47 3,65 731 2,10 13,2 4,33 10,6 0,16 Cladonia mitis 0,08 2,42 16,5 251 2,22 2,35 0,84 20,4 0,14 1 The growth during the last 2-3 years were analysed. 2 Riihling eí al. 1996 Table 2 Heavy metals in moss and lichen, in mg/kg dw, sampled Norðurí á Fossum ,Vestmanna in 1997 and in moss (Hylocomium splendens) sampled at Norðuri á Fossum plus 7 other locations in Eysturoy and in the Streymoy in 1996 og 2000. (Dam, 1998; Larsen and Dam, 1999). ses of so-called conservative elements, like iron, so the degree of dusting may be in- ferred from the magnitude of the conserva- tive element in the moss. Not surprisingly, the concentration of iron is high in the Hy- locomium s. samples. Dividing the concen- tration of mercury by the one of iron in the various moss samples do not give a con- stant value, which could otherwise be ex- pected if the local geology was the source of the mercury. Neither the lead/iron nor the mercury/ironratio in moss is constant, but interestingly, they correlate (squared Pearson’s regression coeff. =0,83) with a maximum value in the sampling site renown for its high precipitation volume (Saksunardalur/Hvalvík). These findings indicate that the source of both mercury and lead is not local geology and that depo- sition of airborne metals frorn ntore remote sources may be a significant contribution to the measured moss metal concentration. Comparing the results of the moss samples to the 1995 European survey indicate that the mercury concentration in Hylocomium s. from the Faroe Islands are comparable to what was found in Russia at the Kola penin- sula and in the Leningrad and Pskov re- gions as well as in Finland. Also, it may be said that it was generally in the lower end of what was found in Sweden, Norway, Den- mark and the Baltic States (Riihling et al., 1996; 1998). In 2002 the uptake of mercury in vegeta- tion was studied in uniclone grass (Lolium multiflorum) specially grown for the pur- pose in controlled circumstances and sta- tioned at five stations on Eysturoy and Streymoy during June to October (Dau- gaard, 2003). The uptake of mercury in grass was found to be positively correlated (P<0,001) to the uptake of mercury in the passive samplers, but in contrast to what was expected, not to the total wet deposited mercury. Also, a correlation to the elevation of the station above sea level was found (P<0,01). The study concluded that there are no indications of an elevated exposure
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