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
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Reproducibility<br />
Customer Standard Deviation, 1sc & 95 Percent<br />
Confidence Estimate (not including bias)<br />
Reproducibility or customer standard deviation (1sc ) is an<br />
estimate of the variability a customer could expect when<br />
submitting a sample to any Photoprocessing Quality<br />
Services laboratory, where any trained analyst could test the<br />
sample using any instrument on any day.<br />
The 95 percent confidence estimate (calculated using the<br />
customer standard deviation) around a single test result will<br />
include the mean value 95 percent of the time.<br />
Three ferricyanide bleach samples were analyzed by four<br />
analysts, on two different days. Duplicate analyses were<br />
performed on each sample, on each of the two days. These<br />
samples were:<br />
1. A “fresh” tank solution prepared at 30.000 g/L<br />
K3Fe(CN) 6 .<br />
2. A “seasoned” ferricyanide bleach sample analyzed at<br />
32.582 g/L K3Fe(CN) 6 .<br />
3. The same “seasoned” solution, as in number 2, above,<br />
analyzed in the same manner, after making a standard<br />
addition of 9.751 g/L K3Fe(CN) 6 .<br />
Sample<br />
“Fresh” at<br />
“Aim”<br />
(30.000 g/L<br />
K 3Fe(CN) 6)<br />
“Seasoned”,<br />
As Received<br />
“Seasoned”<br />
with<br />
Standard<br />
Addition<br />
K 3 Fe(CN) 6 (Potentiometrically)<br />
Mean<br />
(g/L<br />
K 3Fe(CN) 6)<br />
N<br />
Reproducibility<br />
Standard<br />
Deviation, 1S c<br />
(g/L K 3 Fe(CN) 6 )<br />
95 Percent<br />
Confidence<br />
Estimate<br />
(g/L<br />
K 3Fe(CN) 6)<br />
30.445 16 0.094 ± 0.20<br />
32.582 16 0.081 ± 0.17<br />
42.200 16 0.146 ± 0.31<br />
Bias<br />
Bias is a statistically significant deviation of the mean from<br />
the known mix level at a 95 percent confidence level. It is<br />
determined for “fresh” samples only. Bias is not determined<br />
for “seasoned” samples, since the component concentration<br />
level was not determined independently of the test method.<br />
A statistically significant high bias of (+0.445 g/L) for<br />
K3Fe(CN)6 was found for a Process ECP-2 “fresh” tank<br />
developer sample. However, the bias was judged not to be<br />
practically significant.<br />
Recovery<br />
Recovery is used instead of bias for seasoned samples, since<br />
the component concentration level was not determined<br />
independently of the test method. It is defined as the<br />
calculated mean for the seasoned sample with a standard<br />
addition of the component minus the mean for the seasoned<br />
sample, divided by the actual amount of the standard<br />
addition. It is expressed as a percentage. Statistically, the<br />
recovery of 98.6 percent for Process ECP-2 was<br />
significantly different from 100 percent, but was judged not<br />
to be practically significant.<br />
Visual Titration<br />
Repeatability Standard Deviation (1sr) ) & 95 Percent<br />
Confidence Estimate (not including bias)<br />
Repeatability standard deviation is an estimate of the<br />
variability one trained analyst should be able to obtain under<br />
favorable conditions (analyzing a sample, with one<br />
instrument, within one day).<br />
The 95 percent confidence estimate (calculated using the<br />
repeatability standard deviation) around a single test will<br />
include the mean value 95 percent of the time.<br />
To obtain the repeatability data, a single skilled analyst<br />
performed five (5) replicates on each of the following<br />
solutions during methods development (this procedure was<br />
performed by both potentiometric and visual end point<br />
detection):<br />
1. A “fresh” ferricyanide bleach prepared with all<br />
components at their respective “working tank” aim<br />
concentrations.<br />
2. A “seasoned” ferricyanide bleach analyzed as received<br />
at 32.504 g/L.<br />
3. The same “seasoned” solution as in number 2, above,<br />
reanalyzed after making an <strong>analytical</strong>ly weighed,<br />
standard addition of 9.751 g/L K3Fe(CN) 6 .<br />
Sample<br />
“Fresh” at<br />
“Aim”<br />
(30.004 g/L<br />
K 3 Fe(CN) 6 )<br />
“Seasoned”,<br />
As Received<br />
“Seasoned”<br />
with<br />
Standard<br />
Addition<br />
Mean<br />
(g/L<br />
K 3Fe(CN) 6)<br />
K 3 Fe(CN) 6 (Visually)<br />
Bias<br />
Bias is a statistically significant deviation of the mean from<br />
the known mix level at a 95 percent confidence level. It is<br />
determined for “fresh” samples only. Bias is not determined<br />
for “seasoned” samples, since the component concentration<br />
level was not determined independently of the test method.<br />
A statistically significant high bias of (+0.183 g/L) for<br />
K3Fe(CN)6 was found for a Process ECP-2 “fresh” tank<br />
developer sample. However, the bias was judged not to be<br />
practically significant.<br />
2 <strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03<br />
N<br />
Repeatability<br />
Standard<br />
Deviation, 1S r<br />
(g/L K 3 Fe(CN) 6 )<br />
95 Percent<br />
Confidence<br />
Estimate<br />
(g/L<br />
K 3 Fe(CN) 6 )<br />
30.187 6 0.019 ± 0.05<br />
32.504 5 0.013 ± 0.03<br />
42.084 5 0.055 ± 0.14
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