Beiträge zur Kenntnis der Verwitterungsprodukte der Silikate in Ton‐, Vulkanischen und Laterit‐Böden

Bemmelen, J. M. van

doi:10.1002/zaac.19040420120

Cited by 8 publications

(4 citation statements)

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“…Van Bemmeleivs (3) studies are a distinct contribution to our ideas of the composition of soil colloids. He treated some very heavy clay soils from river bottoms in Holland and from Java with hot moderately concentrated hydrochloric acid, then the residue with hot concentrated sulphuric acid, each acid treatment being followed by an extraction with sodium hydroxide.…”

Section: Compounds Presentmentioning

confidence: 99%

“…The fractions analyzed by the different investigators were without doubt all made up chiefly of colloidal matter, even if the upper limit of colloidal size is assumed to be somewhat smaller than that of the largest particle included in the fractions. 3 The fractions in question were therefore probably all similar, although the upper limit of size varies somewhat. The largest particles in the fractions obtained by Schloesing and by Novak and Smolik were probably considerably less than 1 micron and were in this respect more nearly like the material analyzed by the authors.…”

Section: Introductionmentioning

confidence: 95%

“…Calculated by multiplying the CO2 evolved by combustion by 0.471 2. See Gile (/7) for a discussion of the limitations of this method 3. Net determined.The analyses given inTable 2show that the soils selected vary sufficiently in the percentages of the major elements to yield colloids of varying composition, if such variation exists, and although the extremes of composition, especially in calcium carbonate, organic matter, and phosphoric acid, are not represented among the soils selected, the variations in composition ordinarily encountered are covered by these samples.…”

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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: Compounds Presentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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confidence: 99%

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The chemical composition of soil colloids /

Robinson¹,

Holmes²

1924

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“…On the geological side, this was opened by Holland (1903)i on the pedological side by Glinka (I899), followed by Harrassowitz (1930) and Erhart (1935), and on the chemical and mineralogical aspects by Van Bemmelen (1904), Harrassowitz (1926), and Martin and Doyne (192? ).…”

Section: Early Conceptsmentioning

confidence: 99%