Distribution of Chlorinated Hydrocarbon Pesticides and PCBs in the ...

In June 1987, solvent extracted 40 L Teflon bags supplied by
en is Gregor of Environment Canada were filled with snow and used
to briefly store samples until they could be melted in the
aluminum melting tank.
2.4.1 Filtration and Extraction
A 142 mm filter with a Gelman AE glass fibre filter and an
Amberlite XAD-2 extraction column were connected to the stopcock
and the melt water .run out through the column at a flow rate of
less than 100 mL/min.
2.5 Collection of Plankton
Nets used for plankton collection were fabricated with
four different mesh sizes of Nitex(R) monofilament nylon cloth.
These include a 0.75 m diameter by 4 m long net with 20 pm mesh,
a 1 m diameter by 4 m long net with a 73 pm mesh, a 1 m diameter
by 4 m long net with a 253 pm mesh and a 1 m diameter by 4 m long
net with a 460 pm mesh.
Mesh sizes were chosen in an attempt to adequately filter
the water column for the normal range of plankton size groups.
The nets were cleaned during the first sampling period by rinsing
with glass-distilled acetone and hexane prior to deployment.
This cleaning method was found impractical given the
difficulties encountered in shipping large volumes of restricted
*
cargo by air.
A more convenient method of net cleaning was used for the
second sampling trip. An alumnium net container, 30 cm in
diameter and 60 high with a bolt-on top and teflon O-ring seal,
was fabricated for the August trip. This cylinder was
sandblasted and solvent rinsed, then used as a net cleaning
container. The freshly cleaned nets were sealed in the cylinder
and shipped to the Ice Island. The cylinder was then used for
net storage during the sampling period.