Processing kodak motion picture films, module 3 analytical procedures

Automated Titration
An example of a program listing for the determination of
total alkalinity using a METROHM 682 titrator is shown in
APPENDIX 1.
pH Calibration Procedure
1. Fill a beaker half-full with pH 7 calibrating buffer and
a second beaker half-full with pH 4 calibrating buffer.
2. Place the electrodes into a constantly stirred pH 7
calibrating buffer.
3. Press the “MEAS” key on the titrator panel. The
display will read, “MEAS pH***.”
4. Press the “PREP STEP” key until the display reads
“EL CAL 0/1.”
5. Enter “1” and press the “ENTER” key until the display
reads “pH(s)1 7.00.”
6. Allow the electrodes to equilibrate for 2 minutes, then
enter the assigned value of the pH 7 calibrating buffer
and press the “ENTER” key.
7. Remove the electrodes from the cup, rinse the
electrodes with reagent water, blot with a tissue, and
place the electrodes into the pH 4 calibrating buffer.
8. Type in 4.00.
9. Press the “ENTER” key until the display reads
“pH(s)2 4.00.”
10. Allow the electrodes to equilibrate. The slope will be
printed out. The slope should be between 98 and
102 percent. If not, repeat steps 2 through 10.
11. Press the “QUIT” key to continue with the procedure.
Titration of the Sample
1. Pipet (wipe the pipet before leveling) 5.0 mL of
sample into a 150-mL beaker containing 50 mL of
reagent water and a Teflon-coated stir bar.
2. Rinse the electrodes with reagent water and blot the
electrodes with a tissue.
3. Place the electrode assembly and the tip of the buret (if
possible) into the solution. turn on the stirrer.
4. Press “GO.”
Calculations
1. The total alkalinity results are printed on the titrator’s
printer.
2. The total alkalinity is reported to a tenth of a millilitre
(0.1 mL).
Note: The sample size used to determine the total
alkalinity of a solution must be included when
reporting results. For example, the total alkalinity of
solution X is 24.5 mL for a 5.0 mL sample size.
APPENDIX 1
METROHM 682 Titrator Example Programs Total
Alkalinity Determination
Set pH 4.3
Prep. Steps
Pause 10 s
Titr.dosimat 1
Electr. input 1
Parameters:
EP1 pH 4.30
Dyn.pH 1 3.0
Drift1 10.0 mV/s
T(delay) 1 s
Temp. 25°C
Stop V 99.99 mL
Formula: F1 = (F1 = (EP1*C01)
Formula Constant:
C01 = correction factor for the normality of the sulfuric
acid. C01 can be calculated as follows:
Actual normality of sulfuric acid
0.1000
Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 3