The gravimetric method was used to determine the moisture content47. An empty porcelain crucible which was oven-dried at 105 °C for 1 h and cooled in desiccator was weighed (W1). Two gram (W2) of the dry sample was put into the crucible and oven-dried at 105 °C, cooled in the desiccator and weighed (W3), drying was repeated until a constant weight was achieved.
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