. Acidity and acidimetry of soils. Soils. EXAMPLES OF SO-CALLED COLLOIDAL ABSORPTION As examples of what are usually considered colloidal phenomena the following experiments are submitted. EXPERIMENT I—20 g. of yellow-gray silt loam were shaken with various amounts of lime contained in 200 cc. of solution for 12 hrs. and aliquot parts of the clear liquid were titrated with results as shown in Table VII. A greater portion of the lime is absorbed from the dilute solutions than from the more concentrated, thus apparently following the colloidal absorption law. EXPERIMENT II—20 g. of soil were pla
. Acidity and acidimetry of soils. Soils. EXAMPLES OF SO-CALLED COLLOIDAL ABSORPTION As examples of what are usually considered colloidal phenomena the following experiments are submitted. EXPERIMENT I—20 g. of yellow-gray silt loam were shaken with various amounts of lime contained in 200 cc. of solution for 12 hrs. and aliquot parts of the clear liquid were titrated with results as shown in Table VII. A greater portion of the lime is absorbed from the dilute solutions than from the more concentrated, thus apparently following the colloidal absorption law. EXPERIMENT II—20 g. of soil were placed in an extracting apparatus {b, Fig. 2), and a N calcium hydroxide solution allowed to per- colate through. In the diagram a is the receptacle for the base, e a stop- cock for regulating the flow of the base into b, and c a graduated re- ceiver connected with tube d which serves to equalize the pressure. The apparatus is a closed system and duplicate results were easily obtained. cc. of filtrate^ passed through before a pink color could be detected, with phenolphthal- ein as an indicator, representing a lime adsorption at this point of T. as calcium carbonate. At the close of the experiment cc. of filtrate had percolated through, the last 50 cc. being N base, while the soil had absorbed a total of T. of lime as calcium carbon- ate. T. of lime were washed out by the first 700 cc. of distilled water, the end fraction passing through N alkali. tons of lime were still left in the soil. The details are given in Table VIII, in which A and B are duplicate Fig. 2 > Figures given are average of results A and B below. (7). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knight, Henry Granger, 1878- [from old catalog]. [Easton? Pa. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
