Determination of Iodine Value of Activated Carbon


Volumetric flask,

conical flask,




filter paper


* 0.1N Iodine solution ( 40 gm KI in 1 Ltr of Distilled water ).

* 0.05N Sodium Thiosulphate solution (12.5 gm Na2S2O3.5H2O in 1 Ltr Distilled water)

* 1% Starch solution

* Activated carbon


I Standardisation of Iodine solution

* Take 10c.c of 0.1N Iodine solution in conical flask.

* Add 2 drops of Starch solution.

* The pale yellow colour of Iodine Soln turns Blue.

* Titrate with 0.05 N Sodium Thiosulphate till it becomes Colourless.

* Burette reading corresponds to blank reading.(B)


* Weigh very accurately 0.2 gm of Activated carbon

* Introduce it into the Iodine flask which should be completely dry

* Add 40cc of 0.1N Iodine solution

* Shake the flask for 4 minutes and filter it

* Collect the filterate in a dry flask and Titrate 10cc of the filtrate against

Standard Sodium thiosulphate solution using starch as indicator

* Burette reading corresponds to (A)


Iodine value: C x Conversion factor; mg/gm

Factor:Mol wt. of iodine (127) x normality of iodine x 40 / Wt. of carbon x Blank reading


Note: Iodine test should be performed on dry basis

Carbon should be dried in oven at 110oC for three hours before weighing

Iodine value is expressed in mg/gm of carbon

Article by Sivanandan



  1. Ernest says:

    Gud day.I saw another formula about the iodine value of activated carbon,that they are using a conversion factor in the computation of iodine.The conversion factor depends on the normality of the filtrate?Is it the same with your formula?thanks

0 Trackbacks

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>