Fróðskaparrit - 01.01.2009, Blaðsíða 163

EVNAFRØÐIUGAR BLEYTBOTNSDÁTUR Á FØROYSKUM HAVØKI:
LÍVRUNNIÐ TILFAR, NITROGEN, FOSFOR, SINK OG KOPAR
161
Materials and methods
Data from KMBL are mostly from the top
two centimetres of seabed sediment sam-
ples. Samples were mainly collected with van
Veen-type grabs. In the period 1998-2001, a
small number of samples are from the top
five centimetres of core samples.
Untreated samples can differ widely in
organic content due to different particle
sizes and the content of live animals with
large specimens, e.g., specimens ofAphrodita
aculeata (Polychaeta) and Arctica islandica
(Bivalvia) and decaying kelp. To make sam-
ples more homogeneous, all samples since
2001 have been sieved through 0.5 mm
sieves before analysis, which is a likely pre-
dictor that the LOI-values will be somewhat
lower compared to non-sieved samples.
Immediately after collecting the samples
they were transferred into plastic containers
and kept frozen until analyzed at the labora-
tory.
Organic matter is found by loss on igni-
tion (LOI) and is expressed as % weight loss
of dry weight.
All samples from KMBL were analyzed at
the Faroese Food and Veterinary Agency
Laboratory and ALcontrol Laboratories, Swe-
den. For other authors, no information is
available.
1998-2000 Food and Veterinary Agency Lab-
oratory
• Nitrogen - Kjeldahl mod. NMKL 6.
• Phosphorus - NMKL/SLF.
• Zinc - AAS Dansk Standard 259.
• Copper - FAAS mod. Dansk Standard
259 263.
• LOI - Dansk Standard 204.
2001-2003 Food and Veterinary Agency Lab-
oratory
• Nitrogen - destruction, Kjeldahl NMKL
6, 3rd ed. mod.
• Phosphorus - destruction, autoanalyzer
SLF, mod.
• Zinc - Flame photometry, Dansk
Standard 263, mod.
• Copper - Flame photometry, Dansk
Standard 263, mod.
• LOI - 550 °C Dansk Standard 204.
2003-2008 ALcontrol
• Nitrogen - NTOT-NDK, SS028101-1.
• Phosphorus - Svensk Standard-EN
13346 mod./SS11885-1.
• Zinc, Copper - SS-EN 13346 mod. /
Svensk Standardl 1885-1.
• LOI - Svensk Standard-EN 12879-1.
2008-2009 Food- and Veterinary Agency
Laboratory
• Nitrogen - destruction, Kjeldahl NMKL
6, 3rd ed. mod.
• Phosphorus - destruction, autoanalyzer
SLF, mod.
• Zinc - Flame photometry, Dansk
Standard 263, mod.
• Copper - Flame photometry, mod. ISO
11047,1st ed.
• LOI - 550 °C NMKL 173, 2nd ed. 2005,
mod.
ALcontrol Laboratories gives these analytical
uncertainties: LOI ±15%, total-nitrogen ±10-
15 %, total-phosphorus ±20-25 %, zinc ±25-
30 %, copper ±20-30 %.
The Food and Veterinary Agency's labora-
tory gives these analytical uncertainties: LOI
±10 %, total-nitrogen ±2.5 %, total-phos-