. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 NORMAN A. BAILY AND SALLY KELLY 8 SOLUTION. 10 IS EXPOSURE 20 2 5 MRS. TIME FIGURE 4. Exchange of iodide ions between Ascophyllum and natural sea water having a total iodide content of 200 gamma per liter. All iodine was converted to iodides. Solutions were buffered to pH 8 using glycyl-glycine. If an exchange of iodine occurs, then segments pre-soaked in radioactive iodine solutions will release their radioactivity to similar but non-radioactive solutions. As indicated in Table IV, the release of radioactive iodine from
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 18 NORMAN A. BAILY AND SALLY KELLY 8 SOLUTION. 10 IS EXPOSURE 20 2 5 MRS. TIME FIGURE 4. Exchange of iodide ions between Ascophyllum and natural sea water having a total iodide content of 200 gamma per liter. All iodine was converted to iodides. Solutions were buffered to pH 8 using glycyl-glycine. If an exchange of iodine occurs, then segments pre-soaked in radioactive iodine solutions will release their radioactivity to similar but non-radioactive solutions. As indicated in Table IV, the release of radioactive iodine from presoaked seg- ments followed the course which would be expected from an exchange process. The removal of radioactive iodine from sea water by whole plants, using a volume of 825 ml. per plant, is similar to that removed by groups of segments. In order to demonstrate that the iodide concentration influences the exchange rate, removal of iodine was studied when the external concentration of iodide was varied. If segment permeability is assumed to remain constant during the experi- mental period, the only other factor influencing the exchange rate is the relative concentration of iodine in the segments and in the surrounding medium. As the external concentration of iodide is varied, the per cent decrease in radioactivity of TABLE III Radioactive iodine re moved from solution by Ascophyllum segments as a function of time and of initial iodide concentration. Each figure is the result of three determinations Concentration of iodide (ing. /I. I Per cent of initial activity remaining in solution Kxposure time (hours) 1 4 24 89 69 29 86 — 38 89 67 22 — 77 21 — 80 27 100 — 93 91. 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 Biol
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