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

value is less than the procedural detection limit for that
compound.
3) if the blank corrected value was less than ten blank
standard deviations, it was replaced by the value
coresponding to ten blank standard deviations and preceded
with the letter Q denoting that the compound was &
detected but the determined value was less than the
quantitation limit.
-
4) the resulting blank corrected quantities or the detection
and quantitation limits were converted to concentrations
and reported in the following units;
water - pg.~-' (pg = 10-12g)
snow - pg.~-l in melt water
ice - pg.~-l in melt water
sediment - ng.g-', dry weight (ng =
biota - ng.g-', dry weight (also reported as wet weight
and lipid weight
air - pg.m-3
3.2 Quality Control and Quality Assurance in
Organochlorine Analyses.
Throughout the program, from sampling to GC analysis,
steps were included to monitor the quality of the data. The
quality control included scrutiny of instrument calibration,
blanks and replicates. As part of the quality assurance program,
various 'referencet materials such as, standard reference
I