ASTM D1094 standard test method for water reaction of aviation fuels
8. Preparation of Apparatus
8.1 Clean the graduated cylinder thoroughly before carrying out this test. Only cylinders that are adequately cleaned can be used.
8.1.1 Remove traces of oil from the graduated cylinder and stopper by flushing with hot tap water, brushing if necessary. Alternately, remove all traces of oil from the graduated cylinder and stopper, using either n-hexane or n-heptane or the IP petroleum solvent 60/80. Rinse with acetone followed by tap water.
8.1.2 Following the washing described in 8.1.1, immerse the cylinder and stopper in either (1) a non-ionic detergent cleaning solution, or (2) glass cleaning solution described in 7.4. The type of non-ionic detergent and conditions for its use need to be established in each laboratory. The criterion for satisfactory cleaning shall be a matching of the quality of that obtained with chromic acid cleaning solution. Non-ionic detergent cleaning avoids the potential hazards and inconveniences related to handling corrosive chromic acid solutions. The latter remains as the reference cleaning practice and as such may function as an alternate to the preferred procedure-cleaning with non-ionic detergent solutions. Following cleaning with non-ionic detergent or glass cleaning solution, rinse with tap water, then distilled water, and finally rinse with phosphate buffer solution and drain.
8.1.3 Inadequately cleaned glassware used in this test can give misleading indications of fuel contaminants. Use only cylinders that are adequately cleaned. Cylinders that drain cleanly are adequately cleaned. Alternatively, a separation rating (see Table 1) of 2 or less is indicative of adequately cleaned glassware.
9. Preparation of Samples
9.1 It is desirable to take a sample of at least 100 mL to perform this test. A clean container is required.
9.2 Under no circumstances shall the sample be prefiltered after collection. Filtration media can remove surfactants, the detection of which is one of the purposes of this test method. If the test fuel sample is contaminated with particulate matter, allow it to settle before testing.
NOTE 3 - Test method results are known to be sensitive to trace contamination from sampling containers.
