. The Canadian field-naturalist. WALLEYE SUCGI L., NO. PIKE MOOSE L., MAN. Figure 2. Examples of chromatograms of egg and fish extracts under different treatments, showing their different basic characteristics and responses. These chromatograms do not represent specially selected examples. The 1969 GC runs, the "original" chromato- grams from 1965, and the fish chromatograms are each traced on their own scales and represent different recorders on the DC-200 column. A. Standards, the original, and saponified extracts of cormorant eggs. The standards represent an injection of
. The Canadian field-naturalist. WALLEYE SUCGI L., NO. PIKE MOOSE L., MAN. Figure 2. Examples of chromatograms of egg and fish extracts under different treatments, showing their different basic characteristics and responses. These chromatograms do not represent specially selected examples. The 1969 GC runs, the "original" chromato- grams from 1965, and the fish chromatograms are each traced on their own scales and represent different recorders on the DC-200 column. A. Standards, the original, and saponified extracts of cormorant eggs. The standards represent an injection of micrograms per ml each of p, p'-TDE and p, p'-DDT and micrograms per ml of Aroclor 1254. The conversion factor of 10 (see text) was estimated from these differences as well as differences in peak responses. The cormorant extracts (1969) show little change in DDT-TDE interfering peaks upon saponification, suggesting little or no presence of DDT or TDE. The p, p'-DDE is off-scale on these cormorant chromatograms and is indicated by a dashed line, as are following example. B. Original chromatogram of cormorant egg extracts from Dog Lake, Manitoba. C. Original chromatogram of pelican egg extracts from A4oose Lake, Alanitoba. D. Original and saponified extracts of white pelican eggs from Chase Lake, North Dakota, showing conversion p, p'-TDE, revealing smaller peaks underneath. E. Original chromatograms of fish extracts (locations are given in diagram), suggesting prevalence of DDE, TDE, and DDT, in that order, superimposed on a backbround of PCB's. F. Same as E, but from our northernmost sampling sites, showing a general PCB pattern with possibly very small amounts of p, p'-DDE Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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