Fróðskaparrit - 31.12.2000, Síða 149

KANNINGAR AV KYKSILVRI OG ORGANOKLORIDUM
IEINSTØKUM HAVSUGDJORUMIFØROYUM
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was transferred by a pipette into a tared alu-
minium cup and was desiccated in a venti-
lated oven at 30°C. The sample for OC
analysis was defatted using gel permeation
chromatography (GPC) and reduced by
evaporation. The clean up was done by col-
umn chromatography on deactivated
Florisil (0.5%). PCBs, toxaphene, and
organochlorinated pesticides were eluted
with hexane/methylene chloride (75:25).
The eluent was reduced on a “Speed-Vac”
evaporator and further with the aid of a jet
of nitrogen at 40°C. PCBs and organochlo-
rinated pesticides were analysed on a FIP-
5890 gas chromatograph equipped with
dual capillary columns split-splitless injec-
tor and dual 63Ni electron capture detectors.
For each batch of samples, two standards
and one method blank and one reference
control (cod liver oil) were used. The nor-
mal quality control protocol includes dupli-
cate analyses on 10% of the samples.
Peaks were identified by their relative re-
tention times (RRT) obtained on the two
columns, using a computer program devel-
oped at CTQ. The identification window
was 0.001. The precision for PCB con-
geners was 5 to 21%, for organochlorinated
pesticides 6 to 16%, and for Aroclor 1260
6.4%.
The method for converting congener
data to Aroclor 1260 is empirical. It is
based on results obtained from the analyses
of human blood plasmas. After quantifica-
Table 8. The resultsfor pesticides in white-sided dolphins blubber, in pg/kg lipid. The results are shown with
mean valuesfor the groups ofadult and juvenile, females and males.
Talva 8. Skaðakyktaeitur í hvítskjórutum springarum er víst í pg/kg av feitti. Urslitini eru víst sum miðalvirði
við standardfrávikum (við feitari skrift), eins og lægsta og hægsta virði fyri teir fýra undirbólkamar av hon- og
hannhvølum, hvølpum og vaksnum er víst.
# Ref. Sum Chlor- danes B-HCH Mirex Hexa- chloro- benzene alpha- chlor dane gamma- chlor dane cis- nona chlor Oxy chlor dane Trans- nona chlor
juv. females 2968 52 86 498 455 91 738 234 1450
std. dev 1350 15 37 82 113 33 318 104 792
N = 1782 32 38 387 339 53 452 135 742
7 4868 68 140 633 625 145 1246 378 2474
ad. females 583 13 98 69 93 25 133 27 304
std. dev 289 4 37 53 38 8 66 17 174
N = 273 8 56 23 46 16 64 13 135
8 1170 18 159 171 138 37 267 53 687
juv. males 6194 129 121 481 572 147 1372 543 3560
N = na na na na na na na na na
1 na na na na na na na na na
ad. males 8067 99 366 540 698 170 1810 619 4771
std. dev 2366 32 127 120 179 47 607 181 1464
N = 3603 69 158 393 371 90 779 321 2042
12 12020 158 571 803 1055 236 3284 1011 7138