The method describes how to determine the total chlorine content of water using an iodometric method.
The total chlorine reacts with potassium iodide in an acidic solution, releasing free iodine. Immediate reduction of the iodine is performed using a thiosulfate standard solution, of which a known amount in excess of that required was added to the solution in advance. The thiosulfate left untransformed is titrated using a potassium iodate standard reference solution to complete the analysis.
This method describes how to determine the ozone content of water using iodometric titration.
Ozone oxidizes iodide to iodine, which forms a clathrate compound that exhibits a blue color and which loses its color through titration with a sodium thiosulfate solution. The ozone concentration is determined on the basis of the quantity of sodium thiosulfate solution consumed in the reaction.
Determination of the aldehyde concentration in disinfectants.
Suitable for all solutions containing aldehydes.
Aldehyde-containing agents are oxidized by iodine to the corresponding acid:
|
R-CHO + I2 + 2 NaOH |
→ |
R-COOH + 2 NaI + H20 |
The iodine not used for oxidation is re-titrated with sodium thiosulphate.