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Determination of the content of active chlorine in chlorine-containing disinfectants

Chlorine-containing disinfectants are considered suitable for use with an active chlorine content of at least 15%.

The course of determination. A weighed portion of a chlorine-containing disinfectant weighing 1 g is ground in a mortar with a small amount of water, then transferred to a 100 ml flask, add water to 100 ml, shaken, put in a dark place for 30 minutes.

For the study, they take a 250 ml conical flat flask with a ground stopper and pour 5 ml of a 10% solution of KJ and 5 ml of a 10-25% solution of sulfuric or hydrochloric acid. If the liquid is slightly colored, then it should be discolored with one drop of hyposulfite (until the color disappears). Then, 10 ml of the prepared solution of the disinfectant (without stirring the precipitate) are measured with a pipette and poured into a flask into which KJ and acid are added. In this case, the solution turns yellow or brown as a result of iodine release. For a better reaction, 50-100 ml of distilled water are added to the flask. Shake the flask, close the cork and put in a dark place for 10 minutes.



CaOCI2 + 2 KJ + 2CHI (H2SO4) = CaCI + 2 KCI + H2O + J2



After that, the solution is titrated with 0.1 N sodium hyposulfite solution.
The end of the titration is discoloration of the solution. Before the end of titration, add 1-2 ml of a 1% starch solution (the solution turns blue).

The content of active chlorine is determined by the formula:



,



where a is the amount of 0.1 n sodium hyposulfite solution, which went to the titration (ml);

k is the correction coefficient of sodium hyposulfite (in a freshly prepared solution of 1.0);

100 - volume of a volumetric flask in which 1 g of a sample is dissolved;

0,003546 - the amount of active chlorine equivalent to 1 ml of 0.1 n sodium hyposulfite solution;

100 - percent;

c - a sample of the analyte (1 g);

10 - the number of ml of solution taken for analysis.
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Determination of the content of active chlorine in chlorine-containing disinfectants

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