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Soil Science Society of America Journal Abstract -

A Rapid Citrate-Dithionite Extractable Iron Procedure1


This article in SSSAJ

  1. Vol. 31 No. 2, p. 210-211
    Received: Sept 16, 1966
    Accepted: Nov 21, 1966

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  1. George G. S. Holmgren2



A procedure for obtaining iron which is both convenient and reliable is described. The procedure involves shaking the samples overnight in a citrate-dithionite buffer. This is followed by a colorimetric iron determination using orthophenanthroline. The use of an automatic pipette, a flocculating agent, and noncritical quantities of dry reagents facilitates the determination. The results show increased effectiveness and reliability over Kilmer's porcedure for high-iron Oxisols and Ultisols from Puerto Rico.

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