Summary
The solubility of arsenato complexes with ferric chloride is considerably reduced by adding a non-aqueous solvent such as ethyl alcohol or acetone. As already had been done in the case of phosphoric acid2 this property was availed of for the estimation of ferric iron directly with a standard solution of arsenic acid in aqueous nonaqueous medium using K4Fe(CN)6 or cupferron as external indicators. A slight discrepancy at the end point, however, exists but can be removed by applying a correction factor (1.02) determined from our observations.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Dede, L.: Z. anorg. allg. Chem. 125, 28 (1922).
Gupta, T. C., and A. K. Bhattacharya: Z. analyt. Chem. 172, 428 (1980).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gupta, T.C., Bhattacharya, A.K. Quantitative estimation of ferric iron by arsenic acid in aqueous-alcoholic medium. Z. Anal. Chem. 180, 37–38 (1961). https://doi.org/10.1007/BF00469489
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00469489