1.2 Disinfection of the Biofilter

We have chosen sodium hypochlorite as disinfectant but how do we tell if there really is sodiumhypochlorite in our water and how much....

1.2.2 Detection and Quantification of Sodium Hypochlorite

1.2.2.1.a Detection of Hypochlorite in Water - method 1

One of the big advantages of sodium hypochlorite resides in the fact that its presence can easily be visualised through a simple colour reaction. The colour reagent can be made on the spot. Just dissolve some potassium iodide (KI) in a starch suspension.

Let's make the colour reagent ready! (QuickTime Movie; 7.68MB)
Let's make the colour reagent ready! (Real Player movie)
To see the presence of sodium hypochlorite we bring in a drop of chlorine.

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