Fresenius' Zeitschrift für analytische Chemie

, Volume 229, Issue 5, pp 335–339 | Cite as

Titrimetric determination of sodium dithionite with potassium hexacyanoferrate(III) as reagent and methylene blue as indicator

  • D. C. de Groot
Originalabhandlungen

Summary

A rapid titration procedure is recommended for the estimation of Na2S2O4 in commercial sodium dithionite (sodium hydrosulphite, sodium hyposulphite) and in aqueous solutions of this compound, using potassium hexacyanoferrate(III) as reagent and methylene blue as indicator.

With the procedure described there is no interference of decomposition products of dithionite (sulphate, sulphide, sulphite, trithionate, thiosulphate), additives (sodium chloride, phosphates, soda, EDTA, urea), methanol, ethanol, acetone or groundwood.

For a commercial sodium hydrosulphite containing 91% of Na2S2O4 the standard deviation is 0,3% absolute (degrees of freedom 9).

Keywords

Methylene Blue Sulphite Dithionite Thiosulphate Na2S2O4 

Zusammenfassung

Na2S2O4 wird in technischem Natriumdithionit und dessen Lösungen mit Kaliumhexacyanoferrat(III) unter Verwendung von Methylenblau als Indicator titriert. Zersetzungsprodukte des Dithionits (Sulfat, Trithionat, Sulfit, Thiosulfat, Sulfid), Zusätze (Kochsalz, Soda, Phosphate, ÄDTA, Harnstoff), Methanol, Äthanol, Aceton oder Holzschliff stören nicht. In einem technischen Natriumdithionit mit 91% Na2S2O4 betrug die Standardabweichung 0,3% absolut (9 Freiheitsgrade).

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Charlot, G.: Bull. Soc. Chim. France 6, 977 (1939).Google Scholar
  2. [2]
    Charlot, G., and D. Bézier: Quantitative Inorganic Analysis, p. 384. London: Methuen 1957.Google Scholar
  3. [3]
    Committee on analytical methods: Am. Dyestuff Rep. 1957, 443.Google Scholar
  4. [4]
    Furman, N. H.: Scott's standard methods of chemical analysis I, 6th ed., p. 1019. New Yersey: van Nostrand 1962.Google Scholar
  5. [5]
    Furness, W.: J. Soc. Dyers Colourists 66, 270 (1950).Google Scholar
  6. [6]
    Ketelaar, J. A. A.: Chem.-Ing.-Techn. 35, 372 (1963).Google Scholar
  7. [7]
    Knecht, E., and H. Hibbert: Chem. Ber. 40, 3818 (1907).Google Scholar
  8. [8]
    Lynn, S.: Thesis California Inst. Techn. 1954.Google Scholar
  9. [9]
    Merriman, R. W.: Chem. Ind. (London) 42, 290 (1923).Google Scholar
  10. [10]
    Meyer, R. J.: Gmelins Handbuch der anorganischen Chemie, Bd. 2, S. 502. Berlin: Verlag Chemie 1928.Google Scholar
  11. [11]
    Roth, H.: Z. Angew. Chem. 39, 645 (1926); cf. Z. Anal. Chem. 71, 405 (1927).Google Scholar
  12. [12]
    Technical association of the pulp and paper industry: Official Standard T 622 m-42. New York 1942.Google Scholar
  13. [13]
    Wawrzyczek, W., u. W. Rychcik: Z. Anal. Chem. 202, 21 (1964).Google Scholar

Copyright information

© Springer-Verlag 1967

Authors and Affiliations

  • D. C. de Groot
    • 1
  1. 1.NV Centrale Research K.N.Z.HengeloNetherlands

Personalised recommendations