Issue

Vol. 25 No. 11 (2013): Vol 25 Issue 11

Copyright (c) 2013 AJC

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Reductimetric Determination of Peroxydisulphate with Iron(II) in Phosphoric Acid Medium Using Resorufin as a Redox Indicator

https://doi.org/10.14233/ajchem.2013.14216A
K. Vijaya Raju
Department of Engineering Chemistry, College of Engineering, Andhra University, Visakhapatnam-530 003, India
T. Rambabu
Department of Engineering Chemistry, College of Engineering, Andhra University, Visakhapatnam-530 003, India

Corresponding Author(s) : K. Vijaya Raju

vijayarajukurimella@gmail.com

Asian Journal of Chemistry, Vol. 25 No. 11 (2013): Vol 25 Issue 11

Abstract

A simple, accurate and direct reductimetric titration method has been developed for the determination of peroxydisulphate or persulphate using iron(II) as reductant in high phosphoric acid medium (9 M), employing resorufin as a redox indicator. The colour transition of the indicator at the end-point (from red to blue-green) is sharp and reversible. Persulphate in the range 15-50 has been determined with an accuracy of ± 0.6 %. The precision of the method has been determined by computing the pooled standard deviation (0.06 mg) and 95 % confidence limits. In this method persulphate is rapidly and quantitatively reduced to sulphate in a two electron reduction step while resorufin is reduced to its corresponding semiquinone in a one electron reduction step by iron(II). The formal redox potentials of the oxidant system [persulphate/ sulphate couple] and those of the reductant system [iron(III)/iron(II) couple] (under the optimum titration conditions) and the transitional potential of the indicator have been measured. Based on these potentials data, the conditions need in the titration have been offered. The interferences due to diverse ions has been studied.

Keywords

Peroxydisulphate Iron(II) Phosphoric acid Resorufin
Vijaya Raju, K., & Rambabu, T. (2013). Reductimetric Determination of Peroxydisulphate with Iron(II) in Phosphoric Acid Medium Using Resorufin as a Redox Indicator. Asian Journal of Chemistry, 25(11), 6453–6454. https://doi.org/10.14233/ajchem.2013.14216A
Download Citation
Endnote/Zotero/Mendeley (RIS)
BibTeX
References
  1. Vogel's Text Book of Quantitative Chemical Analysis, Longmans, London, edn. 5, pp. 374, 384 (1989).
  2. I.M. Kolthoff and R. Belcher, Volumetric Analysis, Interscience Publishers, Vol. 3, pp. 75,80,112, 177, 240, 509, 625, 629 (1957).
  3. A. Berka, J. Vulturin and J. Zyka, Newer Redox Titrations, Pergamon Press, London, pp. 151, 164, 176, 194 (1965).
  4. E. Rupp and G. Siebler, Pharm. Zentralhalle, 66, 193 (1925).
  5. Y. Yoshida, J. Chem. Soc. (Japan), 59, 49 (1938).
  6. O. Rottova and J. Zyka, Coll. Czech. Chem. Commun., 24, 2809 (1959).
  7. I.M. Kolthoff and E.M. Carr, Anal. Chem., 25, 298 (1953).
  8. J.H. Vander Meulen, Rec. Trav. Chim., 58, 553 (1939).
  9. R. Belcher and T.S. West, Anal. Chim. Acta, 5, 360 (1951).
  10. L. Erdey, I. Buzas and K. Vigh, Periodica Polytechnol., 3, 1 (1959); Chem. Abstr., 53, 16804 (1959).
  11. A. Kurtenacker and H. Kubina, Z. Anal. Chem. Chem., 83, 14 (1930).
  12. F. Sierra and E. Manzon, An. Real. Soc. Espan. Fisica. Quim., 63, 51 (1967).
  13. A.B. Singh and A.N. Singh, J. Indian Chem. Soc., 35, 508 (1958).
  14. N.K. Murthy, V. Satyanarayana and Y.P. Rao, Talanta, 24, 757 (1977).
  15. K.V. Raju, G.D. Sudhakar and T.B. Patrudu,Asian J. Chem., 19, 683 (2007).
  16. K.V. Raju, Asian J. Chem., 23, 1690 (2011).
  17. G.G. Rao and S.R. Sagi, Talanta, 9, 715 (1962).
  18. G.G. Rao and L.S.A. Dikshitulu, Talanta, 10, 295 (1963).
  19. R. Belcher, A. Nutton and W.I. Stephen, J. Chem. Soc., 3857 (1952).
Read More
Author biographies is not available.
Download
PDF
Statistic
Read Counter : 0 Download : 0