2.2.4. Water content measurement
The titrimetric determination of water content was performed at room temperature using a CA-06 Karl–Fischer moisture con- tent meter (Mitsubishi Chemical Co., Ltd., Japan) equipped with a coulometric titration system ( n = 3). The Karl–Fischer reagents, AQUAMICRON ®AX RS as the catholyte and AQUAMICRON ®CXU as the anolyte, were purchased from Mitsubishi Chemical Co.