. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2O4 F. J. BRINLEY AND R. H. BAKER. RELATION OF CONCENTRATION OF HCN TO THE LENGTH OF EXPOSURE. Experiments were carried out to determine whether a low con- centration of cyanide for a long period of time was more fatal than a high concentration for a short period of exposure. When using Ca(CN)2 under field conditions, where one is not able to obtain a long period of exposure, it is necessary to use a very high concentration. The results obtained from more than a thousand tests with two species of aphids and one species of th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2O4 F. J. BRINLEY AND R. H. BAKER. RELATION OF CONCENTRATION OF HCN TO THE LENGTH OF EXPOSURE. Experiments were carried out to determine whether a low con- centration of cyanide for a long period of time was more fatal than a high concentration for a short period of exposure. When using Ca(CN)2 under field conditions, where one is not able to obtain a long period of exposure, it is necessary to use a very high concentration. The results obtained from more than a thousand tests with two species of aphids and one species of thrips, show that con- centration and length of exposure are inversely related up to a certain time, , toxicity = concentration X the time. Beyond a period of 15 minutes it seems that concentration is independent of the time, as it takes practically the same concentration to kill in one hour as in 30 minutes (Figs. 2, 3 and 4). UJ I- o u _J a: u. 0 10 20 30 M-0 £0 60 EXPOSURE IN MINUTES FIG. 3. Curve showing the relation of concentration of HCN to length of exposure and the effect of temperature upon the toxicity of HCN to Aphis rumicis. Solid line, 25° C.; broken line, 30° 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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