2.5. Moisture content of FOG
The content of water was determined by employing a modification
of the AOCS Official Method Ca 2c-25 (AOCS, 1999). Molten
FOG was obtained from fatty waste by heating at 100 C for
60 min. A portion of cooled, molten FOG (5 g, accurately weighed)
then was heated (air oven) at 105 C for 120 min and the weight of
the residue was determined after cooling. Heating of the residue
for 60 min periods was repeated until constant weight (within less
than 0.05%) was achieved.