ASTM D1094 standard test method for water reaction of aviation fuels
10. Procedure
10.1 Measure 20 mL of phosphate buffer solution at room temperature into the cylinder and record the volume to the nearest 0.5 mL. Add 80 mL, at room temperature, of the fuel to be tested and stopper the cylinder.
10.2 Shake the cylinder for 2 min +/- 5 s, two to three strokes per second using 5 to 10-in. (12 to 25-cm) strokes.
NOTE 4 - Caution - Take care to avoid a swirling motion during shaking of the cylinder since swirling action tends to break any emulsion that might be formed.
10.3 Immediately place the cylinder on a vibration-free surface and allow the contents to settle undisturbed for 5 min.
10.4 Without picking up the cylinder, record the following, viewing in diffused light:
10.4.1 The change in volume of the aqueous layer to the nearest 0.5 mL.
10.4.2 The condition of the interface in accordance with Table 2.
10.4.3 The degree of separation of the two phases in accordance with Table 1.
10.4.4 Disregard any slight cloudiness in the fuel layer that is no longer visible when viewed against a white background.
