. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). 198 COOKE 2380 2360 g 2340 nj O aj O E o o E 2320 2300 2280 Background C02 CO§" and HCO3. 200 400 PRESSURE, atm 600 Fig. 6 Dissolution behavior in orthodox artificial seawater. Figure 8 represents a class of experiments in which artificial seawater compounded in accordance with Lyman and Fleming,15 but with sodium ion replacing magnesium ion, was used as the fluid medium. The results shown indicate that a profound change in the system behavior
. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). 198 COOKE 2380 2360 g 2340 nj O aj O E o o E 2320 2300 2280 Background C02 CO§" and HCO3. 200 400 PRESSURE, atm 600 Fig. 6 Dissolution behavior in orthodox artificial seawater. Figure 8 represents a class of experiments in which artificial seawater compounded in accordance with Lyman and Fleming,15 but with sodium ion replacing magnesium ion, was used as the fluid medium. The results shown indicate that a profound change in the system behavior has occurred. No precipitation could be secured at any pressure. Dissolution began immediately once the artificial seawater began to flow, and the solubility of the calcite increased nonlinearly with increase in pressure. Thus the presence of magnesium in solution is necessary for the maintenance of a lysocline. Further experiments showed that the introduction of magnesium into the magnesium-free seawater produced the effect of the lysocline. A further experiment which demonstrated that the precipitated phases do in fact contain magnesium in proportion to the pressure at which they are stable was then performed. Results are shown in Fig. 9. Analytical calcite within a column was coated with a precipitate laid down from seawater at a selected pressure and then removed from the column, dissolved in dilute HCl, and analyzed for magnesium by atomic absorption. Figure 9 shows the results of these incorporation experiments, which were done at pressures of , , and atm. In the first two, precipitation was allowed to proceed to completion (240 min); no precipitation took place in the. 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 Brookhaven National Laboratory; Woodwell, G. M; Pecan, Erene V. [Wash
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