I have a solution contains Cobalt, Nickel, Manganese, Lithium and Iron. I want to measure the ferrous (Fe2+) concentration by potassium dichromate titration. Is mentioned elements affect the ferrous titration accuracy?
Anoop Kumar Srivastava I need the effect of all of these elements, I wrote just cobalt in question heading to summarize it.
Check out the Ksp of those at the pH you would do the titration. Those values are available in literature at 25 oC
Dear Udaya Jayasundara could you please explain me the effect of Ksp on titration (or send me a paper in this regard)?
Most of the dichromate salts that you have here form precipitates. If the Ksp is so small means, they have high solubility. Assume Co2+ and Fe3+ are competing and if your dichromate reacts with Co instead of Fe, then it is indeed an issue. You want to compare the Ksp values of all salts and see that Fe has higher reaction compared to others or you might need to separate or mask them by other means to obtain the accurate Fe3+ concentration.
There are enough articles. Check this,
Ind. Eng. Chem. Res.20064551557-1562
Sina.... Your titration is a redox one and hence any ion that my undergo oxidation will consume some of the oxidizing agent (Dichromate). Thus, Li may not interfere. Further, the oxidation potential of the material will be a determining factor for whether or not it competes with ferrous ion. Consult the redox standard potential of the ions in question. Good luck
dear Mahmood M. Barbooti Laura Bulgariu Udaya Jayasundara many thanks for your answer, They are very useful.
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