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

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2.10 Miscellaneous Sampling for Chlorinated Hydrocarbons
A number of items on the Ice Island which presented
possibilities for interference were collected for potential
analysis. These included shot-hole antifreeze diesel/trichloroethylene
mixture, hydraulic fluid, Kelvar line, vermiculite,
Geogel explosive, Geogel residues, nitex netting and hydro-winch
paint.
2.11 Water Properties
2.11.1 CTD Profiles
An Applied Microsystems CTD-12 was used to obtain
conductivity, temperature, depth profiles. These were taken at
the beginning of each trip. The CTD-12 measures conductivity
with an equivalent salinity accuracy of f0.03 PPT within a range
of 0 PPT to 41 PPT. Temperature is measured with an accuracy of
k0.02C within a range of -2"to 30°C. Depth is measured with an
accuracy of 20.3 m within a range of 0 m to 345 m. The data
transmitted from the CTD-12 was collected via an RS232 interface
with a TANDY Model 100 computer. Salinity was calculated from
conductivity, temperature and pressure by the llUNESCO 1978
PRACTICAL SALINITY SCALE1'. A cable problem did not allow a
direct readout in May 1986, but data was stored internally on
magnetic tape.
Discrete samples for salinity were obtained from bottle
casts with 3L PVC Niskin type samplers in 300 mL flint glass
bottles. Samples were analyzed on the island in May and returned
to Sidney, B.C. for analysis after the second trip.
2.11.2 Nutrients
Samples for dissolved nutrients (reactive silicate, nitrate
and orthophosphate) were collected from the main hydrohole using