By Siv Renvall, Malin Åkerblom (auth.), Francis A. Gunther, Jane Davies Gunther (eds.)

That residues of pesticide and different "foreign" chemical compounds in foodstuff­ stuffs are of shock to every body all over is abundantly attested through the reception accorded past volumes of "Residue stories" and via the pleasant enthusiasm, sincerity, and efforts proven via all of the in­ dividuals from whom manuscripts were solicited. regardless of a lot propaganda on the contrary, there can by no means be any critical query that pest-control chemical substances and food-additive chemical substances are necessary to enough nutrients construction, manufacture, advertising, and garage, but with out carrying on with surveillance and clever keep watch over a few of those who persist in our foodstuffs may possibly from time to time conceivably endanger the general public future health. making sure safety-in-use of those many chemical substances is a dynamic problem, for tested ones are continuously being dis­ put by way of newly constructed ones extra applicable to nutrition tech­ nolOgists, pharmacolOgists, tOxicologists, and altering pest-control standards in revolutionary food-producing economies. those concerns are of actual main issue to expanding numbers of governmental firms and legislative our bodies worldwide, for a few of these chemical compounds have led to a number of mishaps from flawed use. sufficient safety-in-use reviews of any of those chemical compounds in line with­ sisting into our foodstuffs will not be basic issues, they usually comprise the thought of judgments of many people hugely proficient in various advanced organic, chemical, nutrients technological, clinical, pharmacolOgical, and tOXicological disciplines.

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PCB-Florisil technique) is necessary, and the "After" value would be reported as the dieldrin level. Sample Sample Sample Sample Sample Sample Sample Description of specimen a Table I. a' [ g: a L. M. 50 REYNOLDS VIII A x XVI XVII DOE V VI IV VIII o 5 B X 10 15 Minutes Fig. 6. Typical sample indicating the presence of POB's of the Arodor 1260 type in a duckling from the Toronto area. Chromatogram A: 5 ng. of Arodor 1260 numbered I to XVII as in chromatogram B of Figure 3. 35 mg. of duck sample (hexane portion of Florisil split).

B) Their known acute toxicities. c) Their widespread distribution in biolOgical materials and their reported buildup in the food chains. o Ontario Research Foundation, Sheridan Park, Ontario, Canada. 27 28 L. M. REYNOLDS d) Their more recent implication in the derangement of calcium metabolism (PEAKALL 1967, SIMKIS 1967, WELCH et al. 1969) possibly causing the decrease in eggshell thickness and the population decline of certain raptorial species of birds (RATCLIFFE 1967, HICKEY and ANDERSON 1968, STICKEL 1969).

This is normally followed by confirmation of the identities of the pesticides. VITr. Confirmation of pesticide identity Despite the separation of the PCB's and their elimination as sources of interference, the non-specific nature of the EC detector 39 Polychlorobiphenyls makes it necessary to confirm the identity of the pesticides by additional techniques. , polyester such as DEGA or DEGS). Typical A B c 25 30 35 Minutes Fig. 2. ). Chromatogram A: standard mixture of organochlorine pesticides with same amounts as in Figure 1; peak numbers: 1 = heptachlor and aldrin, 2 = lindane, 3 = heptachlor epoxide, 4 = DDE, 5 = dieldrin, 6 = DDT, 7 = DDD.

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