Determination of active substance content of isothiazolinone

26-08-2022

Weigh about 1g of sample by subtraction method, put it in a 250ml iodine measuring bottle with 30ml of water in advance, shake well,

Add 10 ml of sodium bisulfite solution (0.5 mol/l) with a pipette and place for 60 min.

Then add 50ml of iodine solution (about 0.1mol/L) with a pipette, immediately label it with 0.1mol/l sodium thiothioate

Quasi-solution titration, when the solution is light yellow, add 1-2ml starch indicator, continue to titrate until the blue disappears.

end. At the same time do a blank test.

Result calculation:

The active substance content is calculated in mass fraction X, and the value is expressed in %

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