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Determination of dissolved oxygen by colorimetric titration: the Winkler method

Equipment and reagents

  • Standard laboratory equipment, in particular: analytical scale, burette, glassware.
  • Large crystallizer
  • Sodium hydroxide ash pellets
  • Solid manganese chloride MnCl2
  • Sulfuric acid 9 mol/L
  • Solid potassium iodide KI
  • Starch in solution (mix 5 g of soluble starch with 30 mL of water and add this mix to 1 L of boiling water; boil for 3 minutes then leave to cool down)
  • Sodium thiosulfate 0.01 mol/L (aqueous solution)
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