Use measurements of:

• Total gas pressure, TGP (%)

• Oxygen saturation, O2 (%)

• Carbon dioxide, CO2 (mg/L or %)

To solve for:

• Nitrogen gas (N2) (%)

Use measurements of:

• pH

• Temperature (°C)

• Salinity (ppt)

• Alkalinity (mgCaCO3/L, meq/L, dKH)

To solve for:

• Carbon dioxide, CO2 (mg/L)

Use measurements of:

• Total ammonia nitrogen, TAN (mg/L)

• pH

• Temperature (°C)

• Salinity (ppt, ‰)

To solve for:

• Unionized ammonia, NH3 (µg/L or mg/L)