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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B. 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 />
Four analysts analyzed four Accelerator tank samples, on<br />
two different days. Duplicate analyses were performed on<br />
each sample, on each of the two days. These samples were:<br />
1. A “fresh” Accelerator tank solution prepared with all<br />
components at their respective “working tank” aim<br />
concentrations.<br />
2. The same “fresh” solution as in number 1, above,<br />
reanalyzed in the same manner, after making a<br />
standard addition of 0.5448 g/L Na2S2O5 (assay<br />
99.04 percent).<br />
3. A “seasoned” Accelerator tank solution analyzed as<br />
received as 2.6286 g/L Na2S2O5. 4. The same “seasoned” solution, as in number 3, above,<br />
analyzed in the same manner, after making a standard<br />
addition of 0.7360 g/L Na2S2O5 (assay 99.04 percent).<br />
Sample<br />
Mean<br />
(g/L Na 2S 2O 5) N<br />
Na 2 S 2 O 5<br />
Reproducibility<br />
Standard<br />
Deviation, 1s r<br />
(g/L Na 2 S 2 O 5 )<br />
95 Percent<br />
Confidence<br />
Estimate<br />
(g/L Na 2 S 2 O 5 )<br />
“Fresh”<br />
“Fresh” plus<br />
1.96 16 0.162 ± 0.35<br />
Standard<br />
Addition<br />
“Seasoned”,<br />
2.43 16 0.136 ± 0.29<br />
As<br />
Received<br />
“Seasoned”<br />
2.63 16 0.186 ± 0.40<br />
plus<br />
Standard<br />
Addition<br />
3.33 16 0.173 ± 0.37<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 was not determined<br />
for this sample because the component concentration level<br />
was not determined independently of the test method. An<br />
equilibrium is established between sodium metabisulfite and<br />
PBA-1 that effectively lowers the concentration of sodium<br />
metabisulfite in freshly mixed solutions. Therefore bias is<br />
estimated for fresh solutions by spiking a known amount of<br />
sodium metabisulfite to a fresh mix that has been allowed to<br />
sit overnight, and the recovery is then calculated.<br />
The recovery of 86.03 percent was not statistically<br />
significantly different from 100 percent at the 95 percent<br />
confidence level.<br />
Recovery<br />
Recovery is used for seasoned samples, since the component<br />
concentration level was not determined independently of the<br />
test method. It is defined as the calculated mean for the<br />
seasoned sample with a standard addition of the component<br />
minus the mean for the seasoned sample, divided by the<br />
actual amount of the standard addition. It is expressed as a<br />
percentage.<br />
The recovery of 95.84 percent was not statistically<br />
significantly different from 100 percent at the 95 percent<br />
confidence level.<br />
4 <strong>Processing</strong> KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03