Method for Computing alkalinity based on Total Inorganic Carbon (TIC) and related data case study

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Courtesy of TOC Systems, Inc.

Summary
Standard Methods (Ref. 1) has a procedure using nomographs for estimating COt concentrations (Method 4500-CO2 B) based on total alkalinity titrations. The method presented here reverses that process by computing alkalinity based on TIC measurements using infrared technology. These two methods are demonstrated to be compatible, which is not surprising since they use the same stoichiometric relationships.

Inputs

  • Total Inorganic Carbon. mgC/1
  • Water Temperature, °C (Manual or Automatic)
  • Manual Input of Nominal Temperature Value
  • Automatic Input by Temperature Sensor
  • Water pH
  •  Total Dissolved Solids, mg 1 (Manual or Automatic)
  • Manual Input of Nominal TDS value
  • Automatic Ionic Strength Estimate by Conductivity Measurement

Outputs

  • Total Alkalinity, mg 1 as CaCOj
  • Hydroxide Alkalinity, mg 1 as CaCOs
  • Carbonate Alkalinity, mg 1 as CaCC>3
  • Bicarbonate Alkalinity, ing/1 as CaCO3
  • Free Carbon Dioxide, mg 1 as C02

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