. Cyanamid, manufacture, chemistry and uses, by Edward J. Pranke ... nt, cyanamide. The liquidreached almost to the bottom of the tube, hence the soil wasnot quite saturated. A series of tubes so prepared was stop-pered with cork and set in a thermostat at 280 C. Aftervarious periods of time the content of cyanamide remaining inthe tubes was determined as follows: 80 cc. of distilled waterwas added and thoroughly stirred with the contents of thetube. After exactly an hour the contents were filtered withsuction. Of the filtrate (about 70 cc), two portions of 25 were analyzed for cyanami
. Cyanamid, manufacture, chemistry and uses, by Edward J. Pranke ... nt, cyanamide. The liquidreached almost to the bottom of the tube, hence the soil wasnot quite saturated. A series of tubes so prepared was stop-pered with cork and set in a thermostat at 280 C. Aftervarious periods of time the content of cyanamide remaining inthe tubes was determined as follows: 80 cc. of distilled waterwas added and thoroughly stirred with the contents of thetube. After exactly an hour the contents were filtered withsuction. Of the filtrate (about 70 cc), two portions of 25 were analyzed for cyanamide. The following resultswere obtained: 1 Gaz. Chim. Ital. XL, Parte 1, 1910. CYANAMID MANUFACTURE, CHEMISTRY AND USES 39 Quantity of eyanamideMilligrams Initial After % hour After 6 hours After 1 day After 3 days After 5 days After 7 days After 9 days After 11 days After 15 days After 18 days The values obtained are plotted in Fig. 2. It is seen thatthe removal of eyanamide from the soil solution is a maximum. ? —5 71?. Days after appl/cat/on RATE OF REMOVAL OF CYANAMIDEFROM SOIL SOLUTION. Fig. 2. in the first few moments of contact. This probably corre-sponds to an initial period of absorption. It is evident, how-4 4-0 CYANAMID—MANUFACTURE, CHEMISTRY AND USES ever, that the cyanamide is not removed solely by a processof absorption, since it is characteristic of absorption processesthat a state of equilibrium is usually reached between the sub-stance in solution and in the absorbing surfaces within a substance that is being absorbed never disappears entirelyfrom the solution. In the present experiment, the reactionproceeds to complete disappearance of the cyanamide. Therate of removal of cyanamide is practically constant after thefirst 9 days, and shows no tendency to become zero thereafter,as it would if an equilibrium were being approached. Suchrapid removal of the cyanamide to the very end of the experi-ment
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