Fróðskaparrit - 31.12.2000, Side 161

KANNINGAR AV KYKSILVRI OG ORGANOKLORIDUM
I EINSTØKUM HAVSUGDJORUM 1 FØROYUM
165
A: Mirex in pilot whales
500 T
ð: 400
l'-o 300
» !§■ 200
u 100
e 0
LJQ B u
* ■ ■ □ . ■■■aiii i Bt^B5

□ males
■ females
200 300 400 500 600
body length, cm
seems to be a tendency towards a steadily
increasing PCB concentration with age.
The picture is a bit more complex for pilot
whales, however, which seem to go through
a minimum, in-body PCB concentration in
the pre-adult/early-adult stage. The gener-
al large gap in PCB loads between the fe-
males and the males of the species is partly
masked by the different scales used.
The individual with the highest burden of
PCB 7 was also the one with the highest
concentration of CB 153 with 11,936 pg/kg
lipid (Tables 4 and 19). Conversely, the in-
dividual with the lowest burden of PCB 7
also had the lowest concentration of CB
153. What this means is that CB 153makes
up a major part of the total body burden of
PCB. Among the pilot whales, the maxi-
mum concentration of PCB was found in a
male No. 37 from Sandavágur, 26 August
1997, with a concentration of PCB 7 of
Fig. 9. Mirex (in A) and Sum
Chlordanes (in B) in pilot whale
blubber from the two pods
Tórshavn 24 September 1997
and Sandavágur 26 August
1997 are shown in pg/kg lipid.
Mynd 9. Mirex (í A) og Sum-
klordan (í B) úr grindahvala-
spiki í teimum báðum grind-
unum 24. september 1997 í
Tórshavn og 26. august 1997 í
Sandavági er víst í eindini pg/kg
av feitti.
23,530 pg/kg lipid and CB 153 of 7,611
pg/kg lipid. The minimum concentration
of PCB among the pilot whales is found in
a female whale, No. 36 from Tórshavn 24
September 1997, which also had the lowest
concentration of CB 153 equal to 309 pg/kg
lipid. The male with the highest concentra-
tion had a body length of 580 cm. This an-
imal was of more than average size, but not
exceptional considering that the longest
male in the whole group of 466 individuals
covered in the screening (Dam and Bloch,
2000) was 650 cm. This same individual
was also the carrier of the highest concen-
trations of Sum DDT and Mirex. The fe-
Table 20. Precision ofthe mercury analyses is
shown as average relative standard deviation.
Talva 20. Neyvleikin í kyksilvurskanningunum eru
víst sum standardfrávik í miðallutfalli.
Average relative No. of doublet
standard deviation analyses
pilot whales, Leynar 4.2% ii
pilot whales, Tórshavn 4.0% 12
grey seals 5.4% 9
white-sided dolphins 5.3% 6