. Absorption of vapors and gases by soils . atmospheric gas was held fixedin the soil. Their results are given in Table XI, and show that nitro-gen is absorbed to a much greater extent than oxygen, and thateach gas is retained to a different degree by different substances,- aclear indication of the selective power which solids and gases mutuallyexert in absorption. Dewar b has shown that all the inert gases—argon, helium, neon,krypton—can be condensed in charcoal as effectively as ordinarygases at suitable pressure and temperature. a Jour, prakt. Chem., 98, 476 (1866).b Proc. Roy. Soc, 74, 130
. Absorption of vapors and gases by soils . atmospheric gas was held fixedin the soil. Their results are given in Table XI, and show that nitro-gen is absorbed to a much greater extent than oxygen, and thateach gas is retained to a different degree by different substances,- aclear indication of the selective power which solids and gases mutuallyexert in absorption. Dewar b has shown that all the inert gases—argon, helium, neon,krypton—can be condensed in charcoal as effectively as ordinarygases at suitable pressure and temperature. a Jour, prakt. Chem., 98, 476 (1866).b Proc. Roy. Soc, 74, 130 (1904).27876—Bui. 51—08 4 26 ABSORPTION OF VAPORS AND GASES BY SOILS. Table XI.—Absorption of atmospheric gases by various substances, according to Reichardt and Blumtritt. Substance. Charcoal, air dry Peat Garden soil. Fe (OH)3, air dry Fe203. ignited. Al (OH)8, air dry Alumina, dried at 100° C. Clay Clay, moistened River silt Magnesium , pulverized Ratio, bv volume. Gas per100 grams. Nitrogen. I 0xygen C. Absorption of oxygen. In addition to the experiments of de Saussure, Smith, Stenhouse,and Reichardt and Blumtritt, several series of investigations havebeen carried out upon the absorption of oxygen gas. Joulin,a work-ing with ignited charcoal, found that oxygen was so quickly absorbed-that measurements on the velocit}T of absorption were not possiblewith the means at his command. Baker6 has shown that a tem-perature of 450° C. is required to recover the gas from charcoal whichhas absorbed dry oxygen, and that the gas thus obtained is mainlycarbon monoxide, only a little carbon dioxide being formed. De-war,* on the other hand, by using a low-temperature bath of liquidair has succeeded in absorbing in charcoal more oxygen than nitrogenfrom the atmosphere, and upon warming the charcoal to ordinaryroom temperature again a large part of this ox}rgen is liberated, alongwith nitrogen, thus affording a ready means of obtaining oxygen fromair by si
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