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Kodak ECN-0002/1 - page 1
Proces sing KO DAK Moti on Picture Films, Mo dule 3, An alytica l Procedu res • H24. 03 1 Titrimetric Determination of Hypo Index, Thiosulfate, and Sulfite in EASTMAN Color Films, Process EC N -2 Fixer ECN-0002/1 INTRODUCTION This method describes th e titrimetric determin ation of hypo index (total redu ctants), thiosulfate, and sulfite in EASTM ...
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Kodak ECN-0002/1 - page 2
2 Proc essi ng KODA K Moti on Pi cture Films , Modu le 3 , Anal ytica l Proc edu res • H24.03 additions of 34. 57 g/L t hiosulfate ion and 5.444 g/L sodium sulfite wer e mad e to that “ seasoned ” sample. POTENTIOMETRIC TITRATION STATISTICS Repeatability S tandard Deviation, 1s r & 95 Percent Confidence Estimate ( not including bias) Repe ...
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Kodak ECN-0002/1 - page 3
Process ing KODA K Motion Picture F ilms, Modu le 3, A nalytical Procedur es 3 Reco very Recovery is us ed instead of bi as for “ seasoned ” samples, si nce the component concentration level was not determ ined independently of the test method. It is defined as the calculated mean for the “ seasoned ” sample with a standard addition of the ...
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Kodak ECN-0002/1 - page 4
4 Proc essi ng KODA K Moti on Pi cture Films , Modu le 3 , Anal ytica l Proc edu res VISUAL TITRATION STATISTICS Repeatability S tandard Deviati on, 1s r and 95 Per cent Conf idence Es timate Repeatability stand a rd deviati on is an estimate of the variability one trained analy st should be able to obtain under favorable conditions (analyzing a sa ...
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Kodak ECN-0002/1 - page 5
Process ing KODA K Motion Picture F ilms, Modu le 3, A nalytical Procedur es 5 Reco very Recovery is us ed instead of bi as for “ seasoned ” samples, si nce the component concentration level was not determ ined independently of the test method. It is defined as the calculated mean for the “ seasoned ” sample with a standard addition of the ...
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Kodak ECN-0002/1 - page 6
6 Proc essi ng KODA K Moti on Pi cture Films , Modu le 3 , Anal ytica l Proc edu res • H24.03 APPARATUS All volumetric glasswar e sh ould meet all “ Class A ” specifications, as defined by American Society for Testing and Material s (ASTM) Standar ds E 287, E 288, an d E 969, unles s ot he rwis e stat ed. For Potentiometric Titra tion: • Me ...
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Kodak ECN-0002/1 - page 7
Proc essing KO DAK Moti on Pictu re Films, Mo dule 3, Analytica l Procedu res • H24.03 7 B. Thiosulfate Determin ation 1. Sample Pretreatm ent: a. To a 250-m L beaker with a magnetic st ir-bar, add 75 mL of reagent water. b. Pipette 2.0 mL of s ample int o the 250-mL beaker. c. Add 5 mL of 6% formal dehyde (pH 3 .9) to the beaker. d. Start stirri ...
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Kodak ECN-0002/1 - page 8
8 Proc essi ng KODA K Moti on Pi cture Films , Modu le 3 , Anal ytica l Proc edu res • H24.03 CALCULATIONS For Potentiometric Titr ation A. Hypo Index (HI) or Total Reductants : Where: B. Thiosulfate (S 2 O 3 = ): Where: C. Sodium Sulfite (Na 2 SO 3 ): Where: HI (1 ), m L = (mL B lan k A – mL Sample A) (N Na 2 S 2 O 3 ) 0.1000 N N a 2 S 2 O 3 H ...
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Kodak ECN-0002/1 - page 9
Proc essing KO DAK Moti on Pictu re Films, Mo dule 3, Analytica l Procedu res • H24.03 9 Example Potentiometric Calculations: Hypo In dex (HI) or Tot al Reductan ts: Thiosulfa te (S 2 O 3 = ): Sodium Sulfite (Na 2 SO 3 ): Titration mL 0.1 N Na 2 S 2 O 3 Titrant Blank A = 40.50 Sampl e A = 21.85 Blank B = 40.55 Sampl e B = 19.80 HI (1 ), m L = (40 ...
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Kodak ECN-0002/1 - page 10
10 Proc essi ng KODA K Moti on Pi cture Films , Modu le 3 , Anal ytica l Proc edu res • H24.03 For Visual Titration A. Hypo Index (HI) or Total Reductants : Where: B. Thiosulfate (S 2 O 3 = ): Where: C. Sodium Sulfite (Na 2 SO 3 ): Where: HI (1 ), m L = (mL Bl ank A – mL Sample A) (N Na 2 S 2 O 3 ) 0.1000 N N a 2 S 2 O 3 HI (1), mL = mL of 0.10 ...
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