Processing kodak motion picture films, module 3 analytical procedures

Recovery
Recovery is used instead of bias for “seasoned” samples,
since the component concentration level was not determined
independently of the test method. It is defined as the
calculated mean for the seasoned sample with the standard
addition of the component minus the mean for the
“seasoned” sample, divided by the actual amount of the
standard addition. It is expressed as a percentage.
For the Process ECN-2 sample, the recovery was not
statistically different from 100 percent.
For the Process ECP-2D, KUL sample, the recovery of
98.4 percent is statistically different from 100 percent. This
was judged not to be practically significant.
Reproducibility
Customer Standard Deviation, 1sc & 95 Percent
Confidence Estimate (not including bias)
The customer standard deviation (1sc ) is an estimate of the
variability a customer could expect when submitting a
sample to any Photoprocessing Quality Services laboratory,
where any trained analyst could test the sample using any
instrument on any day.
The 95 percent confidence estimate (calculated using the
customer standard deviation) around a single test result will
include the mean value 95 percent of the time.
Three persulfate bleach samples were analyzed by four
analysts, on two different days. Duplicate analyses were
performed on each sample, on each of the two days. These
samples were:
1. A “fresh” tank solution prepared at:
15.001 g/L NaCl for Process ECN-2
15.014 g/L NaCl for Process ECP-2D
2. A seasoned persulfate bleach sample analyzed, “as
received” at:
17.608 g/L NaCl for Process ECN-2
22.701 g/L NaCl for Process ECP-2D
3. The same “seasoned” solution, as in number 2, above,
analyzed in the same manner, after making a standard
addition of:
5.269 g/L NaCl for Process ECN-2
6.990 g/L NaCl for Process ECP-2D
Samples
(Process
ECN-2)
“Fresh” at
“Aim”
(15.001 g/L
NaCl)
“Seasoned”
as received
“Seasoned”
with
Standard
Addition
Samples
(Process
ECP-2D)
“Fresh” at
“Aim”
(15.014 g/L
NaCl)
“Seasoned”
as received
“Seasoned”
with
Standard
Addition
Mean
(g/L NaCl)
APPARATUS
All volumetric glassware should meet all “Class A”
specifications, as defined by American Society for Testing
and Materials (ASTM) Standards E 287, E 288, and E 969,
unless otherwise stated.
5-mL pipette
Beakers, 250-mL
ORION double-junction reference electrode 900200 or
equivalent with (10 percent KNO 3 outer filling solution)
Silver billet indicator electrode BECKMAN Model 39261
or equivalent
Automatic titrator with stirrer, METROHM E536 with an
E665 Dosimat (50-mL burette) or equivalent.
REAGENTS
Use ACS Reagent Grade reagents unless otherwise
specified.
Glacial Acetic Acid
Sodium Chloride, NaCl
0.05 N Silver Nitrate, AgNO 3, standardized to four
decimal places
Water, Type I Reagent—This method was developed
using reagent water equivalent to purer than Type I Grade,
as defined in ASTM Standard D 1193. Other grades of
water, e.g., reverse osmosis (RO), demineralized, or
distilled water, may give equivalent results, but the effects
of water quality on method performance have not been
studied.
2 Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03
(N)
Reproducibility
Standard
Deviation, 1S c
(g/L NaCl)
95 Percent
Confidence
Estimate
(g/L NaCl)
14.949 16 0.052 ± 0.11
17.608 16 0.155 ± 0.33
22.789 16 0.052 ± 0.11
Mean
(g/L NaCl)
(N)
Reproducibility
Standard
Deviation, 1S c
(g/L NaCl)
95 Percent
Confidence
Estimate
(g/L NaCl)
14.946 16 0.050 ± 0.11
22.701 16 0.093 ± 0.20
29.619 16 0.113 ± 0.24