This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...into two main classes, which will include all but a few. Methods depending upon treatment of soil with a neutral salt solution.-The evidence relative to the reactions possible between soil and a neutral salt solution has been discussed in detail previously. As to the mechanism of the reactions, the conclusion has been ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...into two main classes, which will include all but a few. Methods depending upon treatment of soil with a neutral salt solution.-The evidence relative to the reactions possible between soil and a neutral salt solution has been discussed in detail previously. As to the mechanism of the reactions, the conclusion has been drawn that effects due to surface absorption (adsorption), to interchange between solution and colloid complexes, and to interchange between solution and definite silicates are all possible, and probably all operate in the majority of cases. The point to be emphasized is that these reactions, regardless of the causes to which they may be due, are essentially an equivalent interchange of bases, acid hydrogen being considered to be a base in this definition. In the case of a given soil and a particular salt, the amount of acidity obtained in solution will depend upon the absorbent capacity of the soil and the degree to which it is satisfied, upon the nature of the bases which enter the solution by interchange phenomena, whether neutral or acid salt forming, and upon the solubility relations of the products of the reactions which may take place. The latter point is of particular importance and explains why a higher acidity is obtained with an acetate solution, for instance, than with a chloride or nitrate of the same metal, ' and why equivalent solutions of the nitrates or chlorides of several metals will not afford the same results. Perhaps the best known of the methods in this class is that devised by Hopkins, Pettit and Knox using a solution of sodium chloride, and later modified by the substitution of potassium nitrate for sodium chloride and a change in the factor used in calculating." 0 Daikuhara' employs potassium chloride...
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