Processing kodak motion picture films, module 3 analytical procedures
Processing kodak motion picture films, module 3 analytical procedures
Processing kodak motion picture films, module 3 analytical procedures
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Potentiometric Determination of Bromide in Developer<br />
ECN-926C<br />
ECP-926C<br />
Process ECN-2 ECP-2B VNF-1/LC RVNP<br />
Formulas SD-49 SD-50/51 — —<br />
INTRODUCTION<br />
This method contains two separate <strong>procedures</strong> for analysis of<br />
bromide. Procedure A is used for the analysis of fresh tank<br />
and fresh replenisher solutions. Procedure B is used for the<br />
analysis of seasoned tank and reconstituted replenisher<br />
solutions. Analysis of seasoned tank and reconstituted<br />
replenisher solutions using Procedure A will result in<br />
erroneously high results-as much as 0.3 g/L. This effect is<br />
dependent upon seasoning; aging is not a factor.<br />
Procedure A—The sample is acidified and then titrated<br />
potentiometrically with silver nitrate.<br />
Procedure B—Bromide enrichment by selective<br />
precipitation is utilized. All of the bromide is precipitated as<br />
silver bromide along with minor amounts of other silver<br />
salts, by the addition of a small excess of silver to an<br />
acidified sample of seasoned developer. The silver salts are<br />
filtered and developed by a silver halide developer, releasing<br />
soluble bromide. The sample is filtered again, the filtrate is<br />
acidified,<br />
As an aid in selecting the proper inflection point and<br />
detecting instrument trouble or <strong>analytical</strong> errors, a set of<br />
standard titration curves of all developers should be kept on<br />
file. Such curves can be compared with the general shape and<br />
relative position of any routine titration curve. Typical<br />
titration curves are shown in Figures 1 and 2 as an aid in<br />
determining the increment size to use in the region of the end<br />
point and the expected potential change in millivolts.<br />
This method requires handling potentially hazardous<br />
chemicals. Consult the Material Safety Data Sheet for each<br />
chemical before use. MSDS's are available from your<br />
chemical supplier.<br />
Figure 1 Typical Bromide Titration Curve in PROCESS<br />
ECN-2 Developer<br />
Seasoned Tank and<br />
Reconstituted<br />
Replenisher<br />
(Procedure B)<br />
Fresh Tank and<br />
Replenisher<br />
(Procedure A)<br />
Figure 2 Typical Bromide Titration Curve in PROCESS<br />
ECP-2B Developer<br />
<strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 1<br />
mV<br />
-520<br />
-480<br />
-440<br />
-400<br />
-360<br />
-320<br />
-280<br />
-240<br />
4.00 6.00 8.00 10.00 12.00 14.00<br />
F002_0884AC mL Standardized 0.05 N Silver Nitrate<br />
mV<br />
-500<br />
-480<br />
-460<br />
-440<br />
-420<br />
-400<br />
-380<br />
-360<br />
-340<br />
-320<br />
-300<br />
-280<br />
-260<br />
Seasoned Tank<br />
and Reconstituted<br />
Replenisher<br />
(Procedure B)<br />
Fresh Tank and<br />
Replenisher<br />
(Procedure A)<br />
-240<br />
9.00 11.00 13.00 15.00 17.00 19.00<br />
F002_0885AC<br />
mL Standardized 0.05 N Silver Nitrate<br />
21.00
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