MIL-STD-1330D(SH) APPENDIX B
20 September 1996
B.9.4 Homogenize the 500 to 600 mL NOC sample for 3 minutes at a speed of about 7,500 revolutions per minute (rpm) (position 3 on an OMNI Model GLH homogenizer).
B.9.5 Using an eye-dropper or pipette, wet the filter with about 1 mL of isopropyl alcohol. Allow not less than 15 seconds for the isopropyl alcohol to fully wet the filter. This is observable as a change in filter color from opaque white when dry to translucent when wet.
B.9.6 Optional - Excessive isopropyl alcohol can react with NOC to form a white precipitate that may cause high NVR results. If this interference is suspected, the isopropyl alcohol can be removed from the filter by transferring 15 to 25 mL of demineralized water to the filter reservoir and filtering the demineralized water by vacuum or pressurizing the reservoir with oil-free air or nitrogen before proceeding to step B.9.7.
B.9.7 Transfer 200 mL of homogenized NOC to the filter reservoir.
B.9.8 Filter the homogenized NOC at less than 50 mL/min by vacuum or by pressurizing the reservoir with oil-free air or nitrogen. Very little pressure differential (less than 5 psid) will be required to obtain the desired filtration rate. DO NOT EXCEED A FILTRATION RATE OF 50 MILLILITERS PER MINUTE.
B.9.9 Transfer 100 to 110 mL of demineralized water to the filter reservoir to wash the filter and reservoir of residual NOC.
B.9.10 Filter the demineralized water at less than 50 mL/min by vacuum or by pressurizing the reservoir with oil-free air or nitrogen. Very little pressure differential (less than 5 psid) will be required to obtain the desired filtration rate. DO NOT EXCEED A FILTRATION RATE OF 50 MILLILITERS PER MINUTE.
B.9.11 Remove the filter, place in a petri dish, and dry with petri dish cover ajar in an oven at 131 to 140EF (55 to 60EC) for 20 to 30 minutes.
B.9.12 Remove the petri dish with filter from the oven, transfer the
filter to an ambient temperature petri dish, and allow it to cool with the cover
ajar for at least 2 minutes.
B.9.13 Weigh the filter to the nearest 0.1 mg; preferably to the nearest
0.05 mg.
B.10 Calculations.
B.10.1 Calculate the baseline (before use) NVR in NOC by subtracting the initial weight of the filter (step B.9.2) from the final weight of the filter
(step B.9.13) after filtering new-unused NOC. Record the weight difference in mg. Multiply the weight difference by five, and record as baseline (before use) mg/L NVR in NOC.
B.10.1.1 Perform a baseline analysis for each lot or batch of NOC. The term lot or batch refers to the manufacturing lot or batch numbers identified on each container of NOC. Where multiple containers have the same lot or batch number, only one container needs to be sampled. For cleaning applications using multiple containers with different lot or batch numbers, either the average of the
different baselines or the lowest of the different baselines shall be used when determining final NVR in NOC.
B.10.1.2 When determining baseline NVR in new-unused NOC, step B.9.4 may be deleted, and unhomogenized NOC may be used in step B.9.7.
B.10.2 Calculate the post-cleaning (after use) parts per million (ppm) above baseline NVR in NOC as follows:
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