| ΔTCO2 |
= |
change in TCO2 concentration due to equilibration |
| ΔCO2 |
= |
volume of CO2 exchanged between water and headspace |
| Cmeas |
= |
mole fraction of CO2 in equilibrated air |
| Vfill |
= |
volume of headspace created by displacing water in equilibrator |
| Vthis |
= |
volume of tubing & pump not swept while creating headspace |
| Vother |
= |
volume of tubing connecting equilibrator to 6-port valve (filled with air from "other" equilibrator) |
| Vrepl |
= |
volume of tubing connecting 6-port and 10-port valves & sample loop (air "replaced" with calibration gas before each analysis) |
| Cfill |
= |
mole fraction of CO2 in air used to create headspace |
| Cthis |
= |
mole fraction of CO2 in residual air in tubing & pump |
| Cother |
= |
mole fraction of CO2 in preceeding sample in "other" equilibrator |
| Crepl |
= |
mole fraction of CO2 in "replacement" air |
| MolarVolCO2 |
= |
molar volume of CO2 at temperature of equilibration |
| VolH2O |
= |
volume of water sample in equilibrator |
| DensityH2O |
= |
density of water sample at temperature of equilibrator |
| TCO2(end) |
= |
concentration of TCO2 in sample after equilibrating with headspace |
| TCO2(meas) |
= |
concentration of TCO2 measured colulometrically in fresh sample |
| pCO2(end) |
= |
partial pressure of CO2 measured after equilibration |
| PressureEq |
= |
pressure of equilibration (in atmospheres) |
| TALK |
= |
total alkalinity of sample (unchanged during equilibration) |
| pCO2(initial) |
= |
partial pressure of CO2 of sample water PRIOR TO equilibration (at temperature of equilibration) |
