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Steady-State Procedure for Determining the Effective Particle-Size Distribution of Soil Carbonates

Dep. of Soil & Crop Sciences, Texas A&M Univ., College Station, TX 77843

T. J. Moore

ARCO Oil and Gas Co., 2300 W. Plano Parkway, Plano, TX 75075

* Corresponding author.

ABSTRACT

A pH-stat procedure in conjunction with the equal-diameter reduction model was used to estimate the effective particle-size distribution of soil carbonates. Samples were titrated by pH-stat at pH 3 and 5. The cumulative dissolution data and rate constants for the dissolution of Iceland-spar calcite were incorporated into simultaneous equations to obtain estimates of the effective particle-size distributions of soil carbonates. Results obtained by this method from 23 calcareous soils were compared with results obtained by a sieving and sedimentation procedure. The pH-stat procedure resulted in the estimation of a higher proportion of clay-size carbonates than was obtained by the sieving and sedimentation procedure. This difference was attributed predominantly to the higher reactivity of soil carbonates compared with Iceland-spar calcite. The pH-stat procedure was especially useful for obtaining quantitative estimates of the proportion of highly reactive clay-size carbonate with <0.2-µm effective particle diameters.

Contribution of the Texas Agric. Exp. Stn. as Journal Series no. 24704. This research was partially supported by a grant from BARD as Project no. I-743-84.

Received for publication March 29, 1989.