. Cyanamid, manufacture, chemistry and uses, by Edward J. Pranke ... librium is reached and the ratioof the concentrations in the absorbing surfaces and in thesolution becomes constant. Fig. 4 shows the absolute quantity of cyanamide removed asthe concentration increases. It is practically directly propor-tionally to the concentration. This curve shows the samefact as the curve in Fig. 4, namely, that the ratio of the con-centrations in the absorbing surfaces and in the solution is 42 CYANAMID—MANUFACTURE, CHEMISTRY AND USES a constant, a fact highly characteristic of absorption pro-cesses. In
. Cyanamid, manufacture, chemistry and uses, by Edward J. Pranke ... librium is reached and the ratioof the concentrations in the absorbing surfaces and in thesolution becomes constant. Fig. 4 shows the absolute quantity of cyanamide removed asthe concentration increases. It is practically directly propor-tionally to the concentration. This curve shows the samefact as the curve in Fig. 4, namely, that the ratio of the con-centrations in the absorbing surfaces and in the solution is 42 CYANAMID—MANUFACTURE, CHEMISTRY AND USES a constant, a fact highly characteristic of absorption pro-cesses. In this experiment also, the cyanamide finally disappearsentirely from the solution in the course of time, and hence,chemical conversion occurs along with the absorptionphenomena. Taking all the above facts together, it is easy to under-stand that in the initial period of contact between the cyanamidesolution and the soil there is a withdrawal of cyanamide mole-cules from the solution, and a concentration of molecules in Grams Cyanam/e/e app/teaper lOO grams So//.. Fig- 4- the limiting stratum between the solution and the surface ofthe solid soil particles. Along with and subsequent to thisabsorption process there is a chemical conversion of cyanamidemolecules, by catalytic action of soil colloids, as we shall showlater, the products of the reaction being removed continuallyand being replaced by new molecules of cyanamide in the limit-ing stratum. CYANAMID—MANUFACTURE, CHEMISTRY AND USES 43 That bacteria could take no part in the present experimentis evident, since micro-organisms cannot live in the very con-centrated solutions employed. INFLUENCE OF TEMPERATURE. Experiments carried out in a similar manner with 100 gramsof soil and 20 cc. of solution containing per cent, cyanamideat various temperatures gave the following results: At o° At 12° At 300 Initial quantity of cyananiide- • • . 84 tug. 84 nig. 84 mg Quantity present after 2 days. •. 77 69 5i 4 •••
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