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This article in SSSAJ

  1. Vol. 51 No. 6, p. 1479-1482
    Received: May 5, 1986

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Simple Kinetic Fractionation of Reactive Aluminum in Soil “Solutions”1

  1. Richmond J. Bartlett,
  2. Donald S. Ross and
  3. Fred R. Magdoff2



A method is described that measure empirically the highly reactive portion of Al in 50 to 1000-uL soil “solution” samples such as those removed from field moist soil by pressure, centrifuging, immiscible displacement, or lysimetry. Three categories of Al reactivity are identified in a single sample: rapidly reacting (RR Al), moderately rapid (MR Al), and total reactive Al (TR Al). Compared with other operational kinetic methods for labile Al, this method is applicable to small samples and is quick, simple, and precise because measurement is integrated over a period of minutes rather than confined to a single time point observation. Correcting for Fe interference does not require reduction and complexation procedures that alter Al speciation. Because of its sensitivity to very small changes in reactivity of Al, this method should be useful for the experimental evaluation of possible increases in mobility of biologically active soil Al, such as those hypothesized to be induced by acid precipitation.

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