Fróðskaparrit - 31.12.2000, Side 156

160
INDIVIDUAL ANALYSES OF MERCURY AND ORGANOCHLORINES
IN MARINE MAMMALS FORM THE FAROEISLANDS
Fig. 4. The mean concentrations ofthe PCB congeners relative to that ofCB 153 are shown. The resultsfor the
two pods of pilot whales are shown, separated into sub-groups offemales and males.
Mynd 4. Miðalinnihaldið av PCB-kongenunum er víst í mun til innihaldið av CB 153. Úrslitini fyri teir báðar
grindahvalabólkarnar eru víst, býtt í undirbólkar av hon- og hannhvølum.
lished) yielded reason to believe that the
maximum concentration in individual pilot
whales would be approximately three times
the average. Thus, with an average close to
2 mg/kg muscle, the reported nearly 6 mg
of mercury per kg of muscle was indeed ex-
pected.
Organochlorines - PCB
The results of the PCB analyses are sum-
marised in Tables 4 through 6. Comparing
the two pods of pilot whales, the one school
of white-sided dolphins, and the grey seals,
the group with the highest PCB concentra-
tion is the white-sided dolphin males (Fig.
6), but with only marginal differences to
that found in the pilot whale males. The
group with the over-all lowest concentra-
tion is the grey seal females, but the white-
sided dolphin females are nearly as low.
The difference between adult dolphin fe-
males and males is very large compared to
the difference between the adult groups of
pilot whales. The difference between the
dolphin adult groups is a factor of almost
13 in CB 153 concentration. The adult
male seal group, on average, contain about
Table 15. Precision ofthe PCB 7 results, which
were calculated as the sum ofthe individually
quantified congeners CBs 28, 52, 101, 18, 138, 153
and 180.
Talva 15. Neyvleikin í PCB 7-úrslitunum eru víst.
PCB 7-úrslitini vórðu roknað út sum samløgan av
teimum einstøku kongenunum CB 28, 52, 101, 118,
138, 153 og 180.
# Ref. PCB 7 fig/kg lipid, mean std. dev std. dev%
56F 1559 86 5%
58M 13131 105 1%
S8M 5722 178 3%
S14F 14240 370 3%
S21M 9178 240 3%
S37M 22343 1679 8%
S66F 10696 3 0%
T27F 4841 357 7%
T49F 3236 0 0%
T104F 3215 14 0%
T115F 2975 166 6%
T126F 7997 6 0%
H14F 1770 123 7%
H53F 2490 110 4%
H68F 1766 197 11%
All (n = 15) 4%