Processing kodak motion picture films, module 3 analytical procedures

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.)
Calculations
Seasoned Tank—100-mL sample
NaBr, g/L =
(N AgNO3)(mL AgNO3) x (eq. wt. NaBr) x (1000)
=
(mL sample) x (1000)
1.029(mL AgNO 3 )(N AgNO 3 )
4 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03