Processing kodak motion picture films, module 3 analytical procedures

Shaking the Sample with Water
1. Set a timer for 2-1 ⁄ 2 minutes
2. Add 10 mL of temperature - equilibrated (27°C)
distilled water to a 150 mm test tube from a tip up
pipet.
3. Add the stack of film strips; immediately stopper with
a clean cork (not a rubber stopper).
4. Start the timer and shake the test tube vigorously for
2-1 ⁄ 2 minutes. Shake test tube in a horizontal position.
5. After 2-1 ⁄ 2 minutes, pour the water into a 30-mL
beaker and place the beaker in the water bath.
Note: Do not allow the sample to remain in the test tube after
it has been shaken. Proceed directly to the pH measurement.
Determination of the Sample pH
1. Rinse the electrodes with distilled water and dry them
with cleansing tissue.
2. Immerse the electrodes into the sample beaker while it
remains in the water bath.
3. Determine the pH after the electrodes have been in the
sample beaker for two minutes.
4. Remove the sample and rinse the electrodes with
distilled water. Place them in potassium acid
phthalate buffer.
5. Repeat the cross-check after the third sample
measurement. Then place the electrodes in the
potassium acid phthalate buffer for storage, or
restandardize them if more determinations are to be
made.
Note: No more than 20 minutes should elapse between any
standardization and final cross-check.
2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03