Fróðskaparrit - 01.01.2009, Page 179

EVNAFRØÐIUGAR BLEYTBOTNSDÁTUR Á FØROYSKUM HAVØKI:
LfVRUNNIÐ TILFAR, NITROGEN, FOSFOR, SINK OG KOPAR
177
Copper
In Table 1 and 2, it can be seen that total
copper in the surface layers of sediments
from Faroese near shore waters is between
14-120 mg/kg, with a mean value of 61
mg/kg. In relation to the organic content, the
values were from 0.3 to 12.0 mg copper per
gram organic matter.
In the data given by Hoydal and Dam
(2004) (Table 5) the values of copper were
between 65.4-115.9 mg/kg, with a mean
value of 93.5 mg/kg. These data are from
1997 and are mainly from very soft sedi-
ments in the deeper parts of some Faroese
fjords.
The same report presents data from
2000, 2001 and 2003 (Table 6). These values
are within the same range 49.4-96.3 mg/ kg
dry matter and with a mean of 70 mg/kg.
Some of the stations are the same as in Table
5.
From Johansen's (2006) investigation of
low-population, exposed bays on the Faroe
Islands, it can be seen that copper values
were between 58 and 82 mg/kg dry sedi-
ment. Johansen also had three stations from
more centrally located areas and these had
mean values between 77-110 mg/kg dry sed-
iment.
From deeper waters Grøsvik et al. (2000),
Mannvik and Petersen (2002) and Kaldbak
Marine Biological Laboratory (2006) found
values between 5 and 38 mg/kg dry sedi-
ment with respective means of 16.8 and 28
mg/kg dry sediment.
These deeper stations have a distinctly
lower copper value in the sediment, com-
pared to the sediments at the shallow water
stations.
2000 2007 2002 2003 2004 2005 2006 2007 2008 Min Max Mean
Gøtuvík (38 m) 3.9 40 5.4 9.5 4.7 5.8 45 3.2 5.5 3.2 9.5 5.2
Árnafjørður (37 m) 3.5 5.7 3.8 3.7 3.5 5.7 4.0
Miðvágur (20 m) 2.7 2.6 2.6 3.6 2.3 2.6 2.3 3.6 2.7
Undir síðu (47 m) 6.7 46 4.8 43 7.5 4.3 7.5 5.5
Table 13. LOI values for all reported samples from Gøtuvík, Árnafjørður, Miðvágur and Undir síðu.