. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). PHASE PHENOMENA IN CALCITE-SEAWATER SYSTEM 197 2300 2288 g 2276 "to o o | 2264 o t_ u E 2252 2240. 200 400 PRESSURE, atm 600 Fig. 5 Dissolution behavior in Sargasso Sea water. relating pressure to concentration (or total C02). The pressure at which this line intersects the background total CO2 line is called the lysocline pressure for the particular system. Figure 6 shows the results of the same experiment using artificial seawater of sa
. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). PHASE PHENOMENA IN CALCITE-SEAWATER SYSTEM 197 2300 2288 g 2276 "to o o | 2264 o t_ u E 2252 2240. 200 400 PRESSURE, atm 600 Fig. 5 Dissolution behavior in Sargasso Sea water. relating pressure to concentration (or total C02). The pressure at which this line intersects the background total CO2 line is called the lysocline pressure for the particular system. Figure 6 shows the results of the same experiment using artificial seawater of salinity, a pH of , and a total C02 of millimoles/liter. The lysocline pressure is somewhat less, although the intersection has been shifted to the right by the higher total CO2. Real comparisons between experiments require very similar values of the total C02 for establishing the lysocline pressure. Figure 7 shows the results of the same experiment using Sargasso Sea water diluted 1 : 1 with distilled water. The salinity mixture was equilibrated with air at 770 torrs and 23°C before use. Because the range of standards did not extend low enough to include the total C02 of this seawater, the ordinate is expressed in observed counts per second. Here the lysocline pressure has been depressed to 2 atm, indicating that the aggressiveness of seawater in dissolving calcium carbonate is dependent upon its salinity. This follows from the expression of salinity as a measure of the calcium and magnesium concentrations of 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. [Washington] Technical Information Center, U. S. Atomic Energy Commission; [available from National Technical Information Service, Springfield, Va. ]
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