How can i determine cerium (III) concentration in a solution that contains lanthanum ions using visual titration method?
I found some texts in Dean's analytical chemistry handbook but details of method have not explained.
You can use potentiometry method and use potassium dichromate as a titrant. Use Pt electrode as a working electrode and calomel electrode as a reference.
Dr. Mehta's suggestion seems unlikely to work because quadrivalent cerium is a stronger oxidant than is hexavalent chromium. A more promising approach would be to fuse the sample with sodium peroxide (which should convert trivalent Ce to quadrivalent Ce), dissolve the fusion in hot water, acidify with sulfuric acid, boil to destroy peroxide, cool , and then titrate with a reductant like ferrous ammonium sulfate using either Dr Mehta's electrodes or a "ferroin" indicator. Chromium and manganese would interfere.
Dear Siavash Jahanrad,
Vanadium also can used as proxy for tracing Ce reduction as Cr and Mn. The pH of solution also need take into account. Normally the low pH consider for Ce3+appearance in dissolve or solution phase. However need many time adjustment for appropriate the effective pH level for producing more ion metal Ce3+. You are inclined to see this paper as file attached.
Regard's
Zolhizir
I found following texts in Dean's analytical chemistry handbook but details (such as indicator) of method have not explained and i don't know that this method works or not.
"To a 200-mL solution containing 5 mL of 16M HNO3 , add 1− 5 g ammonium, peroxodisulfate, 2− 5 mL 0.015M AgNO3 and boil 10 min. Cool, add excess FeSO4, and titrate with KMnO4."
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