Processing kodak motion picture films, module 3 analytical procedures

Titration
1. Titrate potentiometrically (refer to Universal Method
ULM-0003-01, Potentiometric Titrations for
Photoprocessing Solutions) with standardized
0.05 silver nitrate. Use a silver/silver sulfide
(indicator) and a double junction (reference) as the
electrode pair at a titration speed of 1 mL/min.
Warning
Silver nitrate is poisonous, causes burns, and stains
skin. Avoid contact.
If a Metrohm Automatic Titrator is used, the following
settings are recommended:
Potentiograph E536 Control Setting
Stop %U Off
mm/100% Volume 400
Auto Control 8
min/100% Volume 20
mV x 100 –1
mV - pH Switch (range) 750 mV
mV/pH 100%
°C Auto
Dosimat 655 Control Setting
Mode Switch Mode 1
2. Determine the end point using the Concentric Arcs
Technique (see Method ULM-0003-01,
Potentiometric Titrations for Photoprocessing
Solutions, or subsequent revision). Figure 1, Typical
PBA-1 Titration Curve shows a typical titration curve.
Calculation
PBA-1, g/L =
(N AgNO 3 )(mL AgNO 3 )(eq wt PBA-1)(1000) =
(mL sample)(1000)
(N AgNO 3 )(mL AgNO 3 )(220.2)(1000) =
(50.0)(1000)
4.404(N AgNO 3)(mL AgNO 3)
Where:
eq wt PBA-1 = 220.2 g/equivalent
Figure 1 Typical PBA-1 Titration Curve
F002_0899AC
1.00 2.00 3.00 4.00 5.00 6.00 7.00
mL Standardized 0.05 N Silver Nitrate
2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
Potential (mV)
0.0