Processing kodak motion picture films, module 3 analytical procedures
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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

motion.kodak.com
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22.07.2013 Views

2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03

Potentiometric Determination of Ferrocyanide in Process ECN Ferricyanide Bleach and Ferrocyanide Stock Solutions ECN-0020-01 Process ECN-2 ECP-2D VNF-1/LC RVNP Formulas SR-29 — — — INTRODUCTION Ferrocyanide is determined by an oxidation titration with standardized sulfato cerate in an acid solution. The reaction is: Ce +4 + Fe(CN) 6 4- → Ce +3 + Fe(CN) 6 3- The endpoint of the titration is detected potentiometrically. The electrodes used for the titration are a platinum indicator electrode and a double junction reference electrode. Results are reported in terms of potassium ferrocyanide trihydrate, K 4Fe(CN) 6 3H 2O. This method requires handling potentially hazardous chemicals. Consult the Material Safety Data Sheet for each chemical before use. MSDS's are available from your chemical supplier. Sample Mean (g/L K 4 Fe(CN) 6 3H 2 O) N PRECISION AND BIAS Repeatability Standard Deviation, 1sr and 95 Percent Confidence Estimate (not including Bias) Repeatability standard deviation is an estimate of the variability one trained analyst should be able to obtain under favorable conditions (analyzing a sample, with one instrument, within one day). The 95 percent confidence estimate (calculated using the repeatability standard deviation) around a single test result will include the mean value 95 percent of the time. To obtain the repeatability data, a single skilled analyst performed three (3) replicates on each of the following solutions during methods development. 1. A “fresh” ferricyanide bleach prepared with all components at their respective “working tank” aim concentrations. 2. The same “fresh” solution as in number 1, above, reanalyzed after making an analytically weighed, standard addition of 4.9452 g/L K4Fe(CN) 6 3H2O. 3. A “seasoned” ferricyanide bleach analyzed potentiometrically as received, at 3.5057 g/L K4Fe(CN) 6 3H2O. 4. The same “seasoned” solution as in number 3, above, reanalyzed after making an analytically weighed, standard addition of 1.0280 g/L K4Fe(CN) 6 3H2O. K 4 Fe(CN) 6 3H 2 O Repeatability Standard Deviation, 1s r (g/L K 4 Fe(CN) 6 3H 2 O) 95 Percent Confidence Estimate g/L K 4 Fe(CN) 6 3H 2 O) “Fresh” “Fresh” plus 0.073 3 0.0037 ± 0.016 Standard Addition “Seasoned”, 5.000 3 0.0024 ± 0.010 As Received “Seasoned” 3.506 3 0.0002 ± 0.001 plus Standard Addition 4.526 3 0.0023 ± 0.010 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 1

2 <strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03

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