| Symbol | Description | Uses |
| h3po4g | 3 |
| File | Line number | Procedure | Code |
| ./pkg/dic/carbon_chem.F | 388 | CALC_PCO2_APPROX |
_RL h3po4g, h2po4g, hpo4g, po4g |
| ./pkg/dic/carbon_chem.F | 421 | CALC_PCO2_APPROX |
h3po4g = (pt*hguess*hguess*hguess) / stuff |
| ./pkg/dic/carbon_chem.F | 432 | CALC_PCO2_APPROX |
& - hpo4g - 2.0*po4g + h3po4g |