Fróðskaparrit - 31.12.2000, Side 169

KANNINGAR AV KYKSILVRI OG ORGANOKLORIDUM
I EINSTØKUM HAVSUGDJORUM I FØROYUM
173
lation cocfficient (0.84) for Mirex was
found in relation to p,p’-DDE, and, when
performing the correlation analyses of
Mirex concentration vs. the DDT group for
the males and the females separately, it ap-
peared that the correlation was weaker in
the males than in the females. The correla-
tion between the Mirex and the DDT com-
pound groups is thus different in the two
whale species, as well as between the
whales and the seals.
The very same white-sided dolphin indi-
viduals that were analysed for organochlo-
rines, were also analysed for mercury, and,
thus, correlation analyses were performed
on females and males separately. The
analyses revealed negative correlations be-
tween mercury and the organochlorines for
the females and no positive correlations for
the males.
Quality Assurance - Quality Control
The general quality control protocol of the
laboratories includes duplicate analyses on
10% (POPs) or 15% (Hg) of the samples.
The precision of the mercury analyses is
given as a relative standard deviation be-
tween doublet analyses of the samples
(Table 20). A summary of the precision re-
port for the PCB analyses is given in Table
15. Tables 16 and 17 summarise the results
of the precision analyses, exemplified with
the Sum Chlordane and Sum DDT, as a per-
cent standard deviation. For toxaphene
analyses, the overall mean standard devia-
tion of the 14 duplicate analyses was 4%.
The individual results are provided in Table
18.
1 Mirex (empirical formula C|oCl,2) is also known as a
hexachloropentadiene dimer.
2 Sum DDT = p,p’-DDT, p,p’-DDE, p,p’-DDD, o,p’-
DDT, o,p’-DDE and o.p’-DDL).
Acknowledgements
This work was funded by a grant from DANCEA, as
part of the Arctic Environmental Program. Thanks to
Bjarni Mikkelsen for sharing the seal samples, thus
making the seal analyses possible. Thanks also to our
former secretary for doing the white-sided dolphin sam-
pling and to the laboratory staff for their meticulous
analysis work. Thanks also to Dorete Bloch for com-
ments on an earlier version of this article.
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