FED-STD-791D
emergency treatment and measures, and spill practices of each chemical are explained.
5.2 Cleaning solution glass. Concentrated sulfuric acid [3,0,2] saturated with technical
grade potassium dichromate [1,0,1].
5.3 Distilled or deionized water.
6. PROCEDURE
6.1 Immerse the oil sample bottle in the acid-dichromate cleaning solution, rinse it with
tap water followed by distilled or deionized water, and allow it to drain until dry. If the bottle is
still not clean, soak it in hot cleaning solution for 30 min. Rinse it with tap water followed by
distilled or deionized water, and allow it to drain until dry.
6.2 Pour 10 mL of distilled or deionized water into the sample bottle. Carefully add 100
mL of the fuel to be tested and seal the bottle with the screw cap lined with a Viton gasket.
6.3 Place the sample bottle in the mechanical shaker in an upright position and shake it
for 15 min. Remove the bottle and allow it to remain at 25 3 C, undisturbed in darkness for
24 h (or 72 h during a weekend period).
6.4 After positioning the sample bottle on a flat surface with adequate lighting, rate and
report the condition of the fuel-water interface in accordance with Table 1.
TABLE 1. Appearance of interface.
Rating
Appearance
0
Clean break at fuel-water interface
1
Very slight "skin" at fuel-water interface
2
Skin at fuel-water interface, heavier than #1
3
First sign of white emulsion forming at fuel-water interface
4
Emulsion occurring at interface and starting into water layer
5
Slightly more emulsion than #4 and with thin film on sides of bottle
Emulsion on bottom layer, water still visible
6
7
Semi-solid emulsion with bubbles (assuming a sponge-like configuration
8
Same emulsion as #7, but smaller bubbles
9
Almost a solid emulsion
10
Solid emulsion resembling mayonnaise
6.5 After rating the condition of the fuel-water interface, carefully remove approximately
95 mL of the fuel using the 100-mL syringe fitted Teflon needle.
NOTE: In removing the fuel, be careful not to disturb the fuel-water interface or the
water bottom.
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