3. The Determination of Exchangeable Hydrogen in Soils¹

Secondary Succession on the Piedmont of New Jersey

“…The amount of organic matter was determined by a modification of the Tiurin method (Tiurin 1937). The following chemical characteristics were investigated: conductivity by means of the· standard Kohlrausch conductivity apparatus; pH by use of a Beckman meter and also colorimetrically; exchangeable hydrogen by a modification of the Parker (1929) and Schollenberger (1927Schollenberger ( , 1930 methods; percentage of base saturation by leaching a barium-saturated soil with dilute sulfuric acid, a method employed on occasion at the Pedology Laboratory at Rutgers University; nitrates according to the method of Eastoe & Pollard (1950); and ammonia, sulfates, and chlorides quAlitatively with Nessler Reagent, barium chloride, and silver nitrate quick-tests respectively.…”

The Determination of Selected Chemical Characteristics of Soil Which Affect the Growth and Composition of Plants

“…For an original sample of 10 gm., the milliliters of barium hydroxide used equals the milliequivalents of replaceable hydrogen per 100 gm. of air-dry soil (14).…”

Plant communities on serpentine in Scotland

“…(b) Exchangeable hydrogen was determined by electrometric titration of a normal barium acetate leachate (Parker, 1929).…”