Processing kodak motion picture films, module 3 analytical procedures

3 Analytical Procedures for Chemical Control
INTRODUCTION
Analysis of the critical chemicals in photographic processing
solutions may be used as a basis for discarding a solution or
for adjusting the composition of a solution for further use.
Examples of the routine use of analysis include certification
of replenisher solutions, start-up and daily tank analyses, and
the measurement of silver in fixers. Chemical analyses are
also used for determining proper replenisher formulas with
their corresponding replenishment rates. The cost of the
chemical analyses may be small when compared to the cost
of using a substandard processing solution or the cost of
process downtime.
The analytical procedures in this module are for analysis
of chemicals in the solutions of KODAK Motion Picture
Processes: ECN-2, ECP-2D, VNF-1 and RVNP. The
numbers in the first column of the Table of Contents, identify
the appropriate process for the procedure. A number with no
letter prefix or the ULM- prefix, can be used with all Kodak
film or paper processes. The ECN- prefix indicates the
procedure is only for Process ECN-2 solutions, whereas
ECP- procedures can be used for Process ECP-2D solutions.
ECR- indicates use only with reversal Process VNF-1. The
numbers are also assigned a suffix letter A, B, C, etc,
indicating that the procedure is a revision of an earlier
procedure or is based on an earlier procedure. The numbers
found under the title of each procedure correspond to a
Kodak internal system identifying the appropriate process.
The procedures are as short and simple as possible,
commensurate with the accuracy and precision that is
required for adequate chemical control of the process. We
recommend the laboratory and personnel be supervised by a
chemist. The analyses may be carried out by a trained
technician. Essential equipment includes an analytical
balance, a pH meter (with suitable electrodes, buffers and
filling solutions), thermometers, hydometers, magnetic
stirrers, a constant-temperature water bath, and a
spectrophotometer.
A spectrophotometer equipped for making measurements
in the ultraviolet and visible regions of the spectrum,
provides a rapid means for making certain chemical
analyses. Some models can also be used to check filters for
sensitometers, densitometers and printers.
This module also includes some procedures for noncritical
chemicals, and a collection of standard analytical practices
which are not usually required for routine control. These
may be used as a basis for diagnosing processing troubles as
they arise. These practices are generally used by the
supervisors and technicians in charge of the maintenance of
analytical equipment.
Instructions for the preparation of the required reagents
are given in Module 4, Reagent Preparation Procedures.
Note: The information presented herein is accurate and
reliable to the best of our knowledge and belief, but is
furnished without warranty of any kind. Customers must
make their own determination of the suitability of
completeness of any product, material, and/or procedure for
a specific purpose and adopt such safety precautions as may
be necessary.
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