356 SOILS: PROPERTIES AND MANAGEMENT 



Way found further that exposure to a strong heat de- 

 stroyed the absorptive properties of these substances, as 

 did also treatment with strong hydrochloric acid. In all 

 these respects the absorptive properties of the soil and 

 of the zeolites coincide. 



257. Chabazite. — Eichhorn^ experimented with the 

 natural zeolite chabazite, and found that he could produce 

 substitutions by means of the proper salt solutions. In 

 column I of the table below is given the composition of 

 chabazite used for the experiment ; in column II is stated 

 its composition after treatment with a solution of sodium 

 chloride; and in column III the composition after the 

 zeolite is further treated with a solution of ammonium 

 chloride : — 



Composition of Chabazite originally and after Treat- 

 ment WITH Sodium Chloride and afterwards with 

 Ammonium Chloride 



Column 



I 



II 



III 



Si02 • 



47.4 



48.3 



51.3 



AI2O3 



20.7 



21.0 



22.2 



CaO 



10.4 



6.7 



4.2 



K2O 



0.7 



0.6 



0.6 



NaaO 



0.4 



5.4 



H2O 



20.2 



18.3 



14.9 



(NH4)20 .... 



0.0 



0.0 



6.9 



The substitutions were evidently made at the expense 

 of calcium in the compound, both when treated with 

 sodium and when treated with ammonium salts in chemi- 

 cally equivalent quantities. These and subsequent ex- 



1 EieKliorrL, H. Ueber die Einwirkung Verdtinuter Salz- 

 losungen axif Ackererde. Landw. Centrlb. f. Deutsehland, 

 6 Jabrgang, Band 2, Seite 169-175. 1858. 



