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4 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures
VISUAL TITRATION STATISTICS
Repeatability Standard Deviation, 1s
r
and
95 Percent Confidence Estimate
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).
HYPO INDEX (3.0 mL)
Samples (Process
ECN-2 Fixer)
Mean Level
(mL 0.1 N I
2
)
(N)
Repeatability Standard
Deviation, 1S
r
(mL 0.1 N I
2
)
95 Percent
Confidence Estimate
(mL 0.1 N I
2
)
“Fresh” at “Aim” 29.42 5 0.089 ± 0.25
“Seasoned”, As
Received
47.29 5 0.060 ± 0.17
“Seasoned” with
Standard Addition
57.65 5 0.084 ± 0.23
THIOSULFATE (S
2
O
3
=
)
Samples (Process
ECN-2 Fixer)
Mean Level
(g/L S
2
O
3
=
)
(N)
Repeatability Standard
Deviation, 1S
r
(g/L S
2
O
3
=
)
95 Percent
Confidence Estimate
(g/L S
2
O
3
=
)
“Fresh” at “Aim” 81.37 5 0.10 ± 0.28
“Seasoned”, As
Received
125.29 5 0.24 ± 0.67
“Seasoned” with
Standard Addition
155.73 5 0.19 ± 0.53
SULFITE (Na
2
SO
3
)
Samples (Process
ECN-2 Fixer)
Mean Level
(g/L Na
2
SO
3
)
(N)
Repeatability Standard
Deviation, 1S
r
(g/L Na
2
SO
3
)
95 Percent
Confidence Estimate
(g/L Na
2
SO
3
)
“Fresh” at “Aim” 16.08 5 0.18 ± 0.50
“Seasoned”, As
Received
28.93 5 0.24 ± 0.67
“Seasoned” with
Standard Addition
33.43 5 0.31 ± 0.86
Bias
Bias is a statistically significant deviation of the mean from
the known mix level at a 95 percent confidence level. It is
determined for “fresh” samples only. Bias is not determined
for “seasoned” samples, since the component concentration
level was not determined independently of the test method.
Statistically significant biases were found for hypo index,
thiosulfate, and sodium sulfite (see the table below) for a
“fresh” tank Process ECN-2 Fixer sample. However, the
individual biases for hypo index, thiosulfate, or sodium
sulfite were judged not to be practically significant.
Analyte
Bias
(Measurement Unit of Analyte)
Bias
(%)
Hypo Index
(mL 0.1 N I
2
)
– 0.82 – 2.71%
Thiosulfate
(g/L S
2
O
3
=
)
– 0.696 – 0.85%
Sodium Sulfite
(Na
2
SO
3
)
– 1.322 – 7.6%