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Mechanical Vacuum Extraction vs. Batch Equilibration for Estimation of Exchangeable Cations

Dep. of Geology, Univ. of Pennsylvania, 240 S. 33rd St., Philadelphia, PA 19104

* Corresponding author.

ABSTRACT

Mechanical vacuum extraction (MVE) was compared with a typical batch extraction involving a shake followed by filtration in a Büchner funnel (SF) for estimation of exchangeable cations in acidic forest soils. Significant (P < 0.01 or < 0.001) differences were observed between methods for Ca, Al, and Na; and MVE method estimated 7% higher Ca, 26% higher Al, and 41% lower Na than the SF method. No significant differences were observed between methods for Mg and K. The relative efficiency of the MVE procedure vs. the SF procedure generally increased with increasing charge density, following the lyotropic series. The SF procedure yielded higher precision for Al estimation; for exchangeable Ca, the precision of estimates was equivalent by the two methods.

Received for publication June 5, 1989.