Ankom TDF Guía de referencia

Ash Determination Procedure –IDF/SDF/TDF

Rev 9/20/13

Pg. 1 of 2

Ash Determination

ANKOM Technology recommends that you use ceramic crucibles with fitted

covers to avoid cross contamination or loss of ash. Fold the filter bags so that they

easily fit into the crucibles.

IDF

To determine the ash content within the IDF residue, follow the procedure below.

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.

With your Heat Sealer set to “6” (setting may vary depending on heat sealer and power source), press the Heat

Sealer arm down for 3 to 4 seconds to seal the clear polypropylene part of the bag just above the white filter

material.

Label the folded, sealed filter bag and place it in a labeled ashing crucible.

Repeat steps 1 –3 for all IDF bags to be ashed.

Place covered ashing crucibles with filter bags in a furnace at 600°C for 3 hours.

After the 3 hour furnace time, place the ashed crucibles in desiccator(s) and allow them to cool.

Remove cooled crucibles from the desiccator(s) and record their weights.

10 mm of clear

polypropylene

Ash Determination Procedure –IDF/SDF/TDF

Rev 9/20/13

Pg. 2 of 2

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.

Diatomaceous Earth (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.

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.

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.

Label the folded, sealed filter bag and place it in a labeled ashing crucible.

Repeat steps 1 –3 for all SDF bags to be ashed.

Place covered ashing crucibles with filter bags in a furnace at 600°C for 3 hours.

After the 3 hour furnace time, place the ashed crucibles in desiccator(s) and allow them to cool.

Remove cooled crucibles from the desiccator(s) and record their weights.

10 mm of clear

polypropylene

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