Bulletin Volume 42-57

Bulletin Volume 42-57

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...or else the breaking up of aggregates.already present. Larger aggregates settle more readily and occupy a larger volume, while the smaller aggregates or single grains settle much more slowly and into a compact bed. The direct relationship between the absorption of soluble material by percolates in suspension and their settling has been shown by Linder and Picton," as well as by Whitney and Ober.6 Colloids which settle from suspension in neutral solution carry down small quantities of metallic hydroxides. Several hypotheses have been advanced to account for the formation and breaking up of aggregates. Many of the agents which produce flocculation have been found to be more or less hydrolyzed in aqueous solution, and the flocculating power has been attributed to this hydrolysis. Freundlichr, however, has found that the flocculating power of barium salts, which are scarcely hydrolyzed, is almost equivalent to that of beryllium salts and uranyl nitrate, both of which are strongly hydrolyzed, and as all of these salts have bivalent cations this can not be attributed satisfactorily to the difference in valence. Another theory growing out of their work attributes the precipitation of suspended particles to the ions of the salt in solution. The mechanism of this precipitation is such as to constitute the neutralization of the charge of electricity upon the suspended particles by the ions carrying the opposite charge. On the basis of their experiment, in which they used electrolytes and nonelectrolytes, it has been claimed by Barus/ Bodlander," Freundlich/ and Whitney and Oberf that the power to flocculate colloids is possessed exclusively by electrolytes. The flocculation of colloids by electrolytes has been investigated by Schulze/...show more

Product details

  • Paperback | 350 pages
  • 189 x 246 x 19mm | 626g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236990056
  • 9781236990051