ANKOM TDF Dietary - Manual (Page 62)

Operator’s Manual
pg. 62
Rev E 12/2/14
SDF / TDF
During a TDF procedure there is no residue captured in the IDF Flow-Thru bag.
Therefore, the ash procedure is only required for the SDF filter bag.
DE used in the precipitation process can sometimes be difficult to fully rinse from
the walls of the polypropylene bags. Therefore, ANKOM Technology recommends
that the entire SDF bag be ashed.
To determine the ash content within the SDF / TDF residue, follow the procedure below.
1. Starting at the bottom of the filter part of the bag, fold the bag upward, leaving at least 10 mm at the top of the
clear polypropylene that is not folded. Then fold the bag in thirds from side to side.
2. Set your Heat Sealer to “6” (setting may vary depending on heat sealer and power source) and press the Heat
Sealer arm down for 3 to 4 seconds to seal the unfolded polypropylene to the folded part of the bag.
3. Label the folded, sealed filter bag and place it in a labeled ashing crucible.
4. Repeat steps 1 – 3 for all SDF bags to be ashed.
5. Place covered ashing crucibles with filter bags in a furnace at 600°C for 3 hours.
6. After the 3 hour furnace time, place the ashed crucibles in desiccator(s) and allow them to cool.
7. Remove cooled crucibles from the desiccator(s) and record their weights.
10 mm of clear
polypropylene