Processing kodak motion picture films, module 3 analytical procedures

PROCEDURE A
For Fresh Tank and Replenisher
Note: Prepare the double junction/silver billet electrode pair
and calibrate the electrode-instrument system according to
the instructions given in Method ULM-0003-01,
Potentiometric Titrations for Photoprocessing Solutions or
any subsequent revision.
Sample Treatment
(Perform in an Exhaust Hood)
1. Pipet the sample, wipe the pipet before leveling, into
the beaker indicated below.
Solution Sample Size Beaker Size
Fresh Tank 100.0 mL 600 mL
Replenisher 200.0 mL 800 mL
2. Stir the sample moderately on a magnetic stirrer, and
add very slowly from a tip-up pipet, 50 mL of 18 N
sulfuric acid.
Warning
ACID. Avoid contact with skin and eyes. In case of
contact, flush with water.
3. From a graduated cylinder add Acetone to the solution
in the beaker as it stirs.
Solution Acetone
Fresh Tank 250 mL
Replenisher 300 mL
Warning
EXTREMELY FLAMMABLE. Keep away from heat,
sparks and flame. Keep container closed. Use with
adequate ventilation. Avoid prolonged or repeated
contact with skin.
Titration
1. Using a 25-mL buret, titrate the sample
potentiometrically, according to Method
ULM-0003-01, with standardized 0.05 N silver nitrate.
Note: The titration may be performed most rapidly in
the beginning where the potential change is the
smallest. Refer to Figure 1 to determine the increment
size to use in the region of the end point and the
expected potential change in millivolts.
2. Determine the end point using the concentric arcs
method. (Refer to Universal Method ULM-0003-01,
Potentiometric Titrations for Photoprocessing
Solutions or any subsequent revisions.)
Figure 1 Typical Bromide Titration Curve in Reversal
Color Developer
60
15.00 17.00 19.00 21.00 23.00 25.00 27.00
F002_0886AC mL Standardized 0.05 N Silver Nitrate
Calculations
NaBr, g/L =
(N AgNO3)(mL AgNO3) x (eq. wt. NaBr) x (1000)
=
(mL sample) x (1000)
Fresh Tank—100-mL sample
(N AgNO3 )(mL AgNO3 ) x (102.91) x (1000)
(100) x (1000)
1.029(mL AgNO 3)(N AgNO 3)
Replenisher—200-mL sample
(N AgNO3 )(mL AgNO3 ) x (102.91) x (1000)
(200) x (1000)
0.515(mL AgNO 3 )(N AgNO 3 )
2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
mV
420
380
340
300
260
220
180
140
100
Seasoned Tank
(Procedure B)
Fresh Tank
and Replenisher
(Procedure A)
=
=