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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RELIABILITY<br />
Three standard reversal color developer mixes containing<br />
20, 50 and 80 mg/L of potassium iodide were analyzed in<br />
duplicate by two analysts. For the first analysis of each mix<br />
the analyst added RA-1, equivalent to 56 mg/L, to the<br />
sample before treatment. The second analysis was performed<br />
after a 168 mg/L RA-1 addition. The RA-1 was added just<br />
prior to the analyses because of its tendency to decompose in<br />
developer solutions during storage. The procedure was<br />
repeated the next day using three color developer mixes from<br />
another color reversal process.<br />
The least mean square line and 95 percent confidence<br />
limits for individual results are based on these data. The<br />
95 percent confidence limits are ± 1.71 mg/L of KI.<br />
SPECIAL APPARATUS<br />
pH Meter<br />
Reference Electrode, Double Junction, Orion No. 900200<br />
or equivalent [Filling solutions: Sat. Silver Chloride soln.<br />
or Orion No. 900002 (inner chamber) and 10 percent<br />
potassium nitrate, or Orion No. 900003 (outer chamber)]<br />
Indicator Electrode, Silver Billet, Beckman No. 39261 or<br />
equivalent<br />
Note: Use pipets and volumetric glassware meeting the<br />
“Class A” definition by the National Institute of Standards<br />
and Technology (NIST).<br />
REAGENTS<br />
Use ACS Reagent Grade reagents unless specified<br />
otherwise.<br />
10 N Sodium Hydroxide, NaOH<br />
Chloroform, CHCl 3 , reagent-grade<br />
Acetic Acid, Glacial, CH 3 COOH, Reagent ACS<br />
Sodium Chloride, NaCl<br />
0.005 N Silver Nitrate, AgNO 3<br />
(standardized to 5 decimal places)<br />
PROCEDURE<br />
Extraction<br />
1. Add 250 mL of developer, from a graduated cylinder,<br />
to a 500-mL separatory funnel.<br />
2. Add 25 mL of 10 N sodium hydroxide from a tip-up<br />
pipet.<br />
3. Add 100 mL of chloroform from a tip-up pipet.<br />
Warning<br />
DANGER! Suspected carcinogen. WARNING!<br />
Harmful if inhaled. Can cause embryo-fetal injury<br />
Avoid breathing vapor. Keep container closed. Use<br />
with adequate ventilation. Avoid prolonged or<br />
repeated contact with skin.<br />
4. Stopper and shake the funnel a few times; then vent<br />
through the stopper. Continue to shake the funnel for<br />
30 seconds, venting occasionally.<br />
5. Discard the lower (chloroform) layer and any<br />
emulsion present at the interface.<br />
Note: Waste chloroform should be disposed of<br />
according to locally acceptable practices.<br />
6. Repeat Steps 3, 4, and 5 twice.<br />
Titration<br />
Note: Prepare the electrode pair and calibrate the electrodeinstrument<br />
system according to the instructions given in<br />
Method ULM-0003-01, Potentiometric Titrations for<br />
Photoprocessing Solutions, or any subsequent revision.<br />
1. Drain the remaining (aqueous) layer into a 400-mL<br />
beaker.<br />
2. While stirring on a magnetic mixer, add 35 mL of<br />
glacial acetic acid from a tip-up pipet.<br />
3. Add and dissolve 10 g of sodium chloride.<br />
4. Titrate the sample with standardized 0.005 N silver<br />
nitrate using a 25-mL buret. See instructions for<br />
potentiometric titrations in Method ULM-0003-01,<br />
Potentiometric Titrations for Photoprocessing<br />
Solutions.<br />
5. Determine the end point using the concentric arcs<br />
technique from Method ULM-0003-01,<br />
Potentiometric Titrations for Photoprocessing<br />
Solutions.<br />
Calculation<br />
KI, mg/L =<br />
708(N AgNO 3 )(mL AgNO 3 ) – 3.43<br />
2 <strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
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