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A Rapid Citrate-Dithionite Extractable Iron Procedure¹

ABSTRACT

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.

¹ Contribution from the Soil Survey Lab., SCS, USDA, Lincoln, Neb.

² Soil Scientist, Soil Survey Lab., SCS, USDA, Lincoln, Neb.

Received for publication September 16, 1966. Accepted for publication November 21, 1966.

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