The determination of exchangeable hydrogen in soils
1929
Parker, F.W.
A study was made of four methods for the determination of the amount of exchangeable H in soils. The methods were used on 12 sods of widely different texture, origin, and content of exchangeable H. The H content of a soil was assumed to be equal to the difference between the exchange capacity of the soil and its content of exchangeable bases. This difference was determined. Exchangeable H was then determined by titrating the soil to pH 7.0 with Ba(OH)2 by determining the amount of H replaced by leaching the soil with neutral Ba(C2H3O2)2, and by conductometric titration. The results may be summarized as follows: 1. The difference method, titration to ph 7.0, and the Ba(C2H3O2)2 method give similar results for exchangeable H when compared on 12 Soils. 2. The conductometric titration method is unsatisfactory for the determination of exchangeable H. 3. Acid soils do not contain an appreciable amount of exchangeable Fe and Al. 4. A tentative method, the Ba(C2H3O2)2-NH4Cl method, for the determination of exchangeable H is described.
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