MIL-STD-1622B(SH)
such as Sigma Chemical Company. Do Not Use Powdered KHP; Powdered
KHP Will Not Completely Dissolve.
(b)Thymolphthalein pH indicator, CAS No. 125-20-2, powder, available
from chemical supply houses such as Sigma Chemical Company.
(c)Grade B water.
(d)Isopropyl alcohol as specified in 4.2.4.
5.14.5.3 Reagent preparation.
(a)Prepare a 4 percent wt/vol KHP solution by adding 100.0 + 1.0 mL of grade B water to each 4.0 + 0.1 grams of KHP (see 5.14.5.2(a)).
The KHP may not dissolve in the water immediately. After adding the water to the flask gently swirl or stir the contents for about
1 minute being careful not to deposit solid KHP on the sides of the container. Let the container stand for 10 minutes and swirl or stir the flask for an additional minute. The KHP solution has a 3 month shelf life when stored in a tightly sealed glass container.
(b)Prepare a 0.2% wt/vol thymolphthalein pH indicator solution by adding 50.0 + 1.0 mL of isopropyl alcohol (see 5.14.5.2(d)) to each 0.1 + 0.01 grams of thymolphthalein (see 5.14.5.2(b)). The solution may have to sit for up to 4 hours to allow the thymolphthalein to completely dissolve. The pH indicator should
be clear, water white with no precipitate. The pH indicator has a
1 month shelf life when stored in a tightly sealed brown glass or
plastic container.
5.14.5.4 Procedure.
(a)Transfer 50.0 + 1.0 mL of the 4.0 percent KHP solution
(5.14.5.3(a)) to the beaker or erlenmeyer flask.
(b)Add five drops of the 0.2 percent thymolphthalein pH indicator
solution (5.14.5.3(b)) to the beaker or erlenmeyer flask. The KHP
solution should be clear.
(c)Fill the syringe or buret with NOC test solution. Record to the
nearest 1 mL the level of the NOC in the syringe or buret.
(d)Slowly add NOC to the KHP solution while swirling or stirring the
contents until a blue color end-point persists for 15 seconds.
Record to the nearest 1 mL the final level of the NOC in the
syringe or buret.
5.14.5.5 Calculation. Determine the volume of NOC used by subtracting the final level (5.14.5.4(d)) of NOC solution in the syringe or buret from the initial level (5.14.5.4(c)) of NOC solution in the syringe or buret. Record this volume difference in milliliters. Report this number as the alkalinity - mL of NOC.
5.14.6 Detection of hydrocarbon contamination by swipe. This procedure can be used to identify the presence of hydrocarbons in visible contamination. Some non-visible contamination such as a film of hydrocarbon lubricating oil may also be detected. It is intended to supplement the visual inspection methods of 5.14.1.2 to 5.14.1.4 during maintenance or loss of system cleanliness. The procedure does not measure the concentration of hydrocarbon contamination. The procedure has a sensitivity of 20 to 30 mg/ft2 hydrocarbons.
5.14.6.1 Equipment.
(a)Disposable pure teflon membrane filters, 47 millimeter diameter, pore size 0.45 or 0.5 micron. Suitable filters include Savillex
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