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A Mechanically Controlled Variable Rate Leaching Device¹

ABSTRACT

Twenty-four leaching tubes attached to 60-ml plastic syringes are mounted on the periphery of three vertically aligned slotted discs 45 cm in diameter. The plungers are withdrawn at a controlled rate by a variable speed screw jack that separates the two lower discs holding the plungers and syringe barrels, respectively. Leaching time can be varied from 15 min to 12 hours or more. The final volume of extract is determined by weighing the syringes. Precision of ammonium acetate CEC and extractable cations by this procedure with 2.5 g of soil and 50-ml extract matches that of a comparable manual method using vacuum extraction with 5 g soil and 100 ml of extract. This apparatus has also cut required operator time in half.

¹ Contribution from Natl. Soil Survey Lab., SCS, Lincoln, Nebr.

² Soil Scientists, Natl. Soil Survey Lab., Lincoln, NE 68508 and Industrial Designer, Concept Eng. Co., Lincoln, NE 68502.

Received for publication July 22, 1977. Accepted for publication August 1, 1977.

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