FED-STD-791D
4.10 Desiccator, with desiccant.
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
materials references and standards listed in this section must be handled carefully. Federal Test
Method 10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability, handling and
storage precautions, emergency treatment and measures, and spill practices of each chemical are
explained.
5.2 Isopropyl alcohol, reagent grade [1,3,0].
5.3 Petroleum ether, reagent grade, boiling point range 30 to 60C [1,4,0].
6. PROCEDURE
6.1 Preparation of apparatus and containers.
6.1.1 All components of the filtration apparatus and containers must be washed with hot
tap water containing detergents.
6.1.2 Rinse with hot tap water.
6.1.3 Rinse with distilled water.
6.1.4 Rinse with filtered isopropyl alcohol.
6.1.5 Rinse with filtered petroleum ether.
6.1.6 Place clean plastic film or clean aluminum foil over containers and filtration
apparatus.
NOTE 1:
Rinse a sufficient number of times to completely remove the previous solvent.
6.2 Preparation of reagents.
6.2.1 Filter the petroleum ether, and isopropyl alcohol, through a 0.22-m membrane
filter. Discard the first 50 mL of each and filter enough solvents to complete testing of samples
to be filtered. Containers used for filtered reagents must be cleaned initially as described in
Section 6.1.
NOTE 2: Ground the filter mechanism when filtering flammable solvents to prevent
buildup of static electricity.
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