The titrimetric method of determining soil organic matter is preferable to the ignition loss method, as the need to estimate losses due to bound water is eliminated. The Walkley & Black redoxometric method uses potassium dichromate to oxidise carbon, after which excess dichromate is titrated against ferrous ammonium suplhate, giving a measure of the organic carbon digested. The procedure is described. Samples should not exceed 5g. Dry master samples should be crushed and ground to pass a 0.5 mm sieve. Moist fine grained cohesive soils can be kneaded instead of ground, a correction being made for moisture content. The figures obtained are influenced by the presence of manganese oxides in the soil. The oxidising effect of these can be determined by preliminary titration against a standard solution of ferrous ammonium sulphate. (TRRL)

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  • Corporate Authors:

    Svenska Vag-Och Vattenbyggaren Riksforband

    Regeringsgaten 98
    S-11139 Stockholm,   Sweden 
  • Authors:
    • Mohr, C
  • Publication Date: 1979

Media Info

  • Features: Figures; References;
  • Pagination: p. 19-21
  • Serial:
    • Vag-Och Vattenbyggaren
    • Volume: 25
    • Issue Number: 7/8
    • Publisher: Svenska Vag-Och Vattenbyggaren Riksforband
    • ISSN: 0042-2177

Subject/Index Terms

Filing Info

  • Accession Number: 00311848
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM