Assorbimento di alcune triazine simmetriche su una bentonite di Uri (Sardegna)

The adsorpition of six s-triazines of the chloro- and methoxy-analogue series on a bentonite from Uri (Sardinia) was studied. The H-bentonite shows a higher adsorption than the Na-bentonite. The order of adsorbabiIity of chloro-s-triazines was trietazine > atrazine > propazine; by me· thoxy-s-triazines it was simetone > atratone > prometone. The amount of simetone adsorbed by the H-bentonite occurred in excess of the CEC. The relationship between adsorption, solubility and lenght of the lateral chain of the s-triazine was confirmed. The adsorption was mainly due to van der Waals forces, H-bonding and ionic exchange

Assorbimento di alcune triazine simmetriche sulla frazione organica di un suolo bruno della Sardegna

The adsorption of four s-triazines on the A1-horizon of a brown soil from Sardinia was studied. The adsorption isotherms showed to be essentially linear. Prometryne, hydroxipropazine and prometone were highly absorbed at pH 5, scarcely at pH 2. Propazina behaved differently, showing the highest adsorption at low pH values. Adsorption was affected by the acidity of aqueous systems and tends to increase with a decrease in pH, reaching a maximum in the vicinity of the pK of the respective compounds

Musical Metamorphoses in the Roman World

Certainly, some of the most memorable musical myths that we read today are those narrated by Ovid in the Metamorphoses. In them, one finds a complex interaction between various literary genres, each of which is related in some way to an instrument and a discourse of hierarchy and power. In addition, they highlight how the execution of the song itself has important effects on the listeners