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Abstract
Techniques developed to measure soil CaCO3 activities are not suited for routine measurement in gypsum rich soils. The procedure presented here is a modification of earlier work using stochastic model for dissolution of mixed particle size calcite in conjunction with pH‐stat titration. Its main features is to record the time needed for one gram of standard CaCO3 (semi‐pure CaCO3 in separate size fraction ranging from fine clay to coarse sand) or soil consignment containing one gram CaCO3 (based on calcimeter estimation) to raise the pH of 0.005M H2SO4 acid from 3.0 to 6.0. The procedure includes means to minimize the fluctuation in suspension ionic strength and pCO2 levels. The procedure was tested on calcareous soil (20% CaCO3) undergone limited acidification. Using the activity of the CaCO3 standard, the activity of the soils CaCO3 was stipulated and the effective CaCO3 size distribution was determined.
Notes
School of Agricultural and Forest Sciences, U.C.N.W., Bangor, United Kingdom.