Insert your data in this form and klick on the "calculate" botton to calculate the equilibrium calculation on basis of the alkalinity conservation approach. The description of this method (Luff, Haeckel and Wallmann) is submitted to Computers & Geosciences. For further details, questions or comments sent an E-Mail to (see below).

If no value for TBOH_{4} is given (0.0), the total borate concentration will be calculated from the given salinity concentration.

Input values:

Parameter |
Unit |
Range |
Input |

Temperature | °C | 0-40 | |

Salinity | PSU (ppt) | 0.5-43 | |

Pressure | atm (1 atm at surface) | 0-1200 | |

Total Alkalinity | meq/l | ||

TCO_{2} |
mmol/l | ||

TH_{2}S |
mmol/l | ||

TBOH_{4} |
mmol/l |

Results:

Density of bottom water | kg/m^3 | |

Concentration of CO_{2} |
mmol/l | |

Concentration of HCO_{3}^{-} |
mmol/l | |

Concentration of CO_{3}^{2-} |
mmol/l | |

Concentration of HS | mmol/l | |

Concentration of H_{2}S |
mmol/l | |

Concentration of T(BOH)_{4} |
mmol/l | |

Concentration of BOH_{3} |
mmol/l | |

Concentration of BOH_{4}^{-} |
mmol/l | |

pH bottom water | ||

Number of iterations | ||

Number of new setup attampts^{*} |

^{*} setup attampts: if the first choice of the concentration in thermodynamic equilibrium for the Newton-Raphson Method is too bad for the solution, a new calculation with new randomly generated guess values will be started.

Calculated thermodynamic "constants" with dependency of given temperature, salinity and pressure:

dissociation constant of H_{2}O |
||

1st dissociation constant of CO_{2}(aq) |
||

2nd dissociation constant of CO_{2}(aq) |
||

dissociation constant of B(OH)_{3} |
||

1st dissociation constant of H_{3}PO_{4} |
||

2nd dissociation constant of H_{3}PO_{4} |
||

3rd dissociation constant of H_{3}PO_{4} |
||

dissociation constant of HNO_{3} |
||

dissociation constant of NH_{4} |
||

1st dissociation constant of H_{2}S |
||

solubility product of CaCO_{3} (Aragonite) |
||

solubility product of CaCO_{3} (Calcite) |

© Copyright R. Luff (DG2HL) 1997-2000.