Processing kodak motion picture films, module 3 analytical procedures

RELIABILITY
Procedure A—The 95 percent confidence limits for an
individual analysis of a fresh tank or replenisher sample are
estimated to be slightly less than ± 0.05 g/L NaBr.
Procedure B—This procedure was specifically designed
for current mix formulations and variance due to seasoning.
Any change in mix formulation, especially in bromide
concentration, may necessitate recalibration. This procedure
will accurately analyze bromide in seasoned tank and
reconstituted replenisher solutions containing as much as
1.5 g/L sodium bromide in SD-49 developer and 2.10 g/L
sodium bromide in SD-50 or SD-51 developer. Analytical
results will be low on solutions exceeding these
concentrations of sodium bromide. Eight seasoned samples
in the appropriate bromide concentration range were
analyzed by three analysts. Based on 24 data points obtained,
the 95 percent confidence limits for an individual
determination are ± 0.05 g/L sodium bromide.
SPECIAL APPARATUS
pH Meter
Reference Electrode, Double Junction, Orion No.900200
or equivalent
Indicator Electrode, Silver Billet, Beckman No. 39261 or
equivalent
Millipore Filter apparatus
Millipore Filter membrane (0.45 micron porosity 47 mm)
Exhaust Hood
Note: Use pipets and volumetric glassware meeting the
“Class A” definition by the National Institute of Standards
and Technology (NIST).
REAGENTS
Use ACS Reagent Grade reagents unless specified
otherwise.
1.0 M Ammonium Nitrate, NH 4NO3 Celite
Silver Halide Developer
0.05 N Silver Nitrate, AgNO 3 (standardized to 4 decimal
places)
18 N Sulfuric Acid, H 2SO4 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, wipe the pipes before leveling, 50.0 mL of
sample into a 250-mL beaker.
Warning
ACID. Avoid contact with skin and eyes. In case of
contact, flush with water.
2. Stir the sample moderately on a magnetic stirrer and
add very slowly from a tip-up pipes, the indicated
volume of 18 N sulfuric acid.
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 Figures 1 and 2 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 concentric arcs from
Method ULM-0003-01, Potentiometric Titrations for
Photoprocessing Solutions.
Calculations
Process Formula Acid
ECN-2 SD-49/49R 25 mL
ECP-2B
SD-50/50R
SD-51/51R
50 mL
50 mL
NaBr, g/L =
(N AgNO3 )(mL AgNO3 ) x (eq. wt. NaBr) x (1000)
=
(mL sample) x (1000)
(N AgNO 3 )(mL AgNO 3 ) x (102.91) x (1000)
(50) x (1000)
2.058(mL AgNO 3)(N AgNO 3)
2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
=