2.1 For dry sample: Thaw sample to room temperature. Mix sample thoroughly by
turning the tightly closed bottle up and down three times. Weigh accurately 3 – 4 g sample, in
duplicate, into a pre weighed drying container (W2).
2.2 For liquid/wet/slurried sample: Mix sample thoroughly and weigh 5–15 g
slurried sample and 20 g for liquid sample into a pre-weighed drying container with acid washed
sand and stirring rod (W2). For liquid samples, dry to a consistency of a thick paste over a boiling
water bath before drying in an oven.
2.3 Place container with sample in the air oven pre-heated to 100 ± 5°C for 2 – 3
hours.
2.4 Transfer the container with the dried sample into a desiccator, cool for 30 min
and weigh (W3). Repeat the heating procedure until constant weight is obtained. Different in
weight between two consecutive weighing should not be more than 5mg.