Ion Chromatography as an Alternative to Standard Methods for Analysis of Macro-nutrients in Mehlich 1 Extracts of Unfertilized Forest Soils

  • Authors: Fischer, Joseph B.; Miller, James H.
  • Publication Year: 2004
  • Publication Series: Miscellaneous Publication
  • Source: Communications in Soil Science and Plant Analysis, Vol. 35, Nos. 15 & 16, pp. 2191-2208, 2004

Abstract

This study evaluates ion chromatography (IC) as an alternative to atomic absorption (AA) and inductively-coupled plasma spectromctry (ICP) for analysis of potassium (K), magnesium (Mg), and calcium (Ca), and and as an alternative to antimonylmolybdate colorimetry and ICP for analysis of phosphorus (P) macro-nutrients in Mehlich 1 extracts. Soils typical of pine forests in the southeastern United States were tested. IC correlates well with AA and ICP for K and Ca, but not for Mg, unless conditions are chosen that resolve Mg from manganese (Mn). IC does not correlate very well with colorimetry for P at extract levels below 2 mg kg-1 or in extracts with high levels of dissolved organic matter complexes of aluminum (Al) and iron (Fe). ICP results for P exceed both IC and colorimetry by 3-5 mg kg-1 for all soils tested. The merits of IC relative to AA, ICP, and colorimetry for forest soil testing are discussed.

  • Citation: Fischer, Joseph B.; Miller, James H. 2004. Ion Chromatography as an Alternative to Standard Methods for Analysis of Macro-nutrients in Mehlich 1 Extracts of Unfertilized Forest Soils. Communications in Soil Science and Plant Analysis, Vol. 35, Nos. 15 & 16, pp. 2191-2208, 2004
  • Keywords: Ion chromatography, Soil, Forest, Analysis, Mehlich 1, K, Ca, Mg, P, Colorimetry, ICP, Atomic absorption, Macro-nutrients
  • Posted Date: April 1, 1980
  • Modified Date: August 22, 2006
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