Processing kodak motion picture films, module 3 analytical procedures

CALCULATIONS
For Na3Fe(CN) 6
g/L Na3Fe(CN) 6 = (mL Na2S2O3 ) (N Na2S2O3 ) (eq wt Na3Fe(CN) 6 ) (1000)
(mL sample) (1000)
For K 3 Fe(CN) 6
g/L K3Fe(CN) 6 = (mL Na2S2O3 ) (N Na2S2O3 ) (eq wt K3Fe(CN) 6 ) (1000)
(mL sample) (1000)
Where:
mL Na2S2O3 = volume of Na2S2O3 in milliliters required to reach
the equivalence point
N = normality of the Na2S2O3 in milliequivalents per
milliliter (meq/mL)
eq. wt = equivalent weight of ferricyanide in milligrams per
milliequivalents [280.92 for Na3Fe(CN) 6 , 329.25 for
K3Fe(CN) 6 ]
1000 = factor to convert milligrams to grams of ferricyanide
mL sample = milliliters of sample pipetted in step 1 of Removal of
the Interfering Constituents
1000 = factor to convert mLs of sample to Litres
If mL 0.1000 N Na 2 S 2 O 3 = 34.77
(g/L) Na 3 Fe(CN) 6 =
(g/L) Na 3 Fe(CN) 6 = 39.07
(g/L) K 3 Fe(CN) 6 =
(g/L) K 3 Fe(CN) 6 = 45.79
(34.77) (0.1000) (280.92) (1000)
(25) (1000)
(34.77) (0.1000) (329.25) (1000)
(25) (1000)
Figure 1 Typical Titration Curve, Ferricyanide in ECN-2
Ferricyanide Bleach
DENSITY
4.0
3.0
2.0
1.0
0.0
4.0
F002_0985AC
Exposure: Daylight
Process: C-41
Densitometry: Status M
3.0 2.0 1.0 0.0
LOG EXPOSURE (lux-seconds)
B
G
R
1.0
2.0
Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 5