Ueber die Menge und Zusammensetzung des Kolloidtones in den Böden

Novák, Václav; Smolik, L.

doi:10.1007/bf01427899

Cited by 2 publications

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“…In these colloids, Nbs. 10,12,15,17,18,20,25,26,29,30,36,40,43, and 44, it is certain that there can not be the quantity of the hydrated silicates assumed in the calculations. In the extreme case, that of the Ontario surface colloid, there can not be more than onethird the quantity of kaolinite and nontronite calculated.…”

Section: Itmentioning

confidence: 99%

The chemical composition of soil colloids /

Robinson¹,

Holmes²

1924

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Fragments of soil-forming minerals 25 Attempted fractionation of colloidal material 27 Action of solvents on colloidal material 28 Compounds indicated hy stoicbioraetrical calculation 34 Conclusions regarding compounds present 37 Summary 38 Literature cited 39 REVIEW OF EARLIER WORK ULTIMATE CHEMICAL COMPOSITION Previous knowledge of the chemical composition of the earthy colloidal matter has been contributed by the soil investigator, the geologist, and the workers in the ceramic industries. Considerable knowledge of the composition of soil colloids can be gotten from the composition of the finest fractions that are obtained in the mechanical analysis of soils. The clay fraction of the American system of mechanical analysis (14) may not be entirely colloidal, but it is nearly so, and the " Schlamm " fraction of the European workers is probably nearly all colloidal. Previous work on the composition of these finest mechanical fractions will be considered in detail. Failyer, Smith, and Wade (13) studied the partial composition of the sand, silt, and clay separates and found that the finest soil separates-that is, the more nearly colloidal-were richer in potash, lime, and phosphoric acid than the coarser separates. Loughridge, cited by Hilgard (22, p. 385) and Tolman (44) have reported some work on the composition of clay separates as determined by digestion in strong acids. In every case they found the clay separates were higher in soluble iron and aluminum than the whole soil. A few chemical analyses for the total constituents of the finest soil separates obtained by several other investigators are available in the literature. 2 These analyses are given in Table I. 1 Reference is made by number {italic) to " Literature cited," p. 39. 3 A number of analyses by acid digestion of fine soil separates of colloidal dimensions are to be found in the literature, but on account of the difficulty of comparing such analyses for the total constituents and also on account of the difficulty of interpreting the figures for the " insoluble residue," the acid digestion analyses are not giveih in the table. No.

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Section: Itmentioning

confidence: 99%