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
Calculations Na 4 Fe(CN) 6 1O H 2 O, mg/L = where: Undiluted Diluted Using Solution B Using Solution C (∆Α 700)(22.6 * )(2.28 † )(dilution factor) * 22.6 = factor used to convert absorbance at 700 nm to mg/L of Fe(CN) 6 –4 † 2.28 = factor used to convert mg/L Fe(CN) 6 –4 to mg/L Na 4Fe(CN) 6 1O H 2O (∆Α 700 ) = (∆Α 700 sample – ∆Α 700 blank) Na 4 Fe(CN) 6 1O H 2 O, mg/L = Na 4 Fe(CN) 6 1O H 2 O, mg/L = Na 4 Fe(CN) 6 1O H 2 O, mg/L = (∆Α 700 )(22.6)(2.28)(1) = 51.53(∆Α 700 ) (∆Α 700 )(22.6)(2.28)(10) = 515.3(∆Α 700 ) (∆Α 700)(22.6)(2.28)(100) = 5152.8(∆Α 700 ) 2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
Hydroquinone in Sound Track Developer ECP-2-407 Process ECN-2 ECP-2D VNF-1/LC RVNP Formulas — SD-43b — — INTRODUCTION A phosphate buffer is added to the sample to control its pH. Then the hydroquinone (HQ) is extracted with ethyl acetate. Alcohol and sulfuric acid are added to the ethyl acetate layer to effect a single-phase system. This solution is then titrated with sulfato cerate. The end of the titration is detected by the change in color from orange or light green or colorless. 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. SPECIAL APPARATUS 50-mL Buret (offset-tip) 5-mL Syringe Note: Use pipets and volumetric glassware meeting the “Class A” definition by the National Institute of Standards and Technology (NIST). REAGENTS Use ACS Reagent Grade reagents unless specified otherwise. Potassium Monohydrogen/Dihydrogen Phosphate Buffer, pH 7.9 at 27°C (80.6°F). Ethyl Acetate, water saturated 7.0 N Sulfuric Acid, H 2 SO 4 Ferroin Indicator Methyl Alcohol, CH 3 OH 0.05 N Sulfato Cerate (standardized to 4 decimal places) PROCEDURE Extraction of Hydroquinone 1. Add 25 mL of potassium monohydrogen/dihydrogen phosphate buffer, pH 7.9, from a tip-up pipet, to a 250-mL separatory funnel No. 1. 2. Using a 5-mL syringe, add 2.00 mL of sample to funnel No. 1. 3. Add, from a tip-up pipes, 50 mL of water-saturated ethyl acetate to funnel No. 1. 4. Shake the separatory funnel briskly for 15 seconds; then allow the layers to separate (30 seconds or more). 5. Transfer as completely as possible the bottom (water) layer to separatory funnel No. 2 without losing any of the top layer containing HQ. 6. Add, from a tip-up pipet, 50 mL of water-saturated ethyl acetate to funnel No. 2. 7. Shake funnel No. 2 briskly for 15 seconds; then allow the layers to separate (30 seconds or more). 8. Discard the bottom layer. (A small amount of the bottom layer may be left in the funnel.) 9. Transfer the contents of funnel No. 2 to separatory funnel No. 1. 10. Add 10 m L of potassium monohydrogen /dihydrogen phosphate buffer, pH 7.9, from a tip-up pipet. 11. Shake briskly for 10 seconds and allow the layers to separate. 12. Discard as completely as possible the bottom layer without losing any of the top layer containing HQ. Preparation of the Top Layer for Titration of HQ 1. Add, from a tip-up pipet, 50 mL of methyl alcohol and 50 mL of 7.0 N sulfuric acid to a 400-mL beaker. 2. Transfer the top layer to the 400-mL beaker. 3. Add three drops of Ferroin indicator. Absorbance Measurements 1. Place the beaker on a magnetic stirrer and stir at a moderate rate. (Be careful to keep the sample from splashing.) 2. Immerse the tip of the buret into the sample, and titrate with standardized 0.05 N sulfato cerate at a moderate rate. 3. When near the end point, withdraw the tip of the buret from the solution, and reduce the rate of delivery to about three drops a second. Titrate to the first light green color that persists for 15 seconds. Calculations HQ, g/L = (N cerate)(mL cerate – blank)(eq wt of HQ)(1000) (mL sample)(1000) (N cerate)(mL cerate – 0.27)(55.0)(1000) (2.00)(1000) 27.5(N cerate)(mL cerate – 0.27) Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 1 = =
- Page 105 and 106: Titrimetric Determination of Persul
- Page 107 and 108: APPARATUS Conical Flask with stoppe
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- Page 113 and 114: Potentiometric Determination of Sod
- Page 115 and 116: PROCEDURE Treatment of the Sample 1
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- Page 121 and 122: Procedure Treatment and Titration o
- Page 123 and 124: Iodometric Determination of Sulfite
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- Page 127 and 128: Automated Titration An example of a
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- Page 133 and 134: Titrimetric Determination of EASTMA
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- Page 137 and 138: Titration of the Developing Agent w
- Page 139 and 140: Cerimetric Determination of CD-2 Co
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- Page 149 and 150: CALCULATIONS For Na3Fe(CN) 6 g/L Na
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- Page 159 and 160: Titrimetric Determination of Hypo I
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- Page 167 and 168: Examples: Titration mL 0.1 N Na 2S
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- Page 171 and 172: APPARATUS All volumetric glassware
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- Page 175 and 176: PROCEDURE A. Preparation of Sample
- Page 177 and 178: Titrimetric Determination of Persul
- Page 179 and 180: APPARATUS Conical Flask with stoppe
- Page 181 and 182: Determination of the pH of the East
- Page 183 and 184: Determination of the pH of Processe
- Page 185 and 186: Potentiometric Determination of Sil
- Page 187 and 188: APPARATUS METROHM 536 Titrator or e
- Page 189 and 190: Determination of Sodium Metabisulfi
- Page 191 and 192: II. Visual Endpoint Titrations A. R
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Calculations<br />
Na 4 Fe(CN) 6 1O H 2 O, mg/L =<br />
where:<br />
Undiluted<br />
Diluted<br />
Using Solution B<br />
Using Solution C<br />
(∆Α 700)(22.6 * )(2.28 † )(dilution factor)<br />
* 22.6 = factor used to convert absorbance at 700 nm to mg/L of<br />
Fe(CN) 6 –4<br />
† 2.28 = factor used to convert mg/L Fe(CN) 6 –4 to<br />
mg/L Na 4Fe(CN) 6 1O H 2O<br />
(∆Α 700 ) = (∆Α 700 sample – ∆Α 700 blank)<br />
Na 4 Fe(CN) 6 1O H 2 O, mg/L =<br />
Na 4 Fe(CN) 6 1O H 2 O, mg/L =<br />
Na 4 Fe(CN) 6 1O H 2 O, mg/L =<br />
(∆Α 700 )(22.6)(2.28)(1) =<br />
51.53(∆Α 700 )<br />
(∆Α 700 )(22.6)(2.28)(10) =<br />
515.3(∆Α 700 )<br />
(∆Α 700)(22.6)(2.28)(100) =<br />
5152.8(∆Α 700 )<br />
2 <strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
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