High Technology, Inc.
109 Production Road,
Walpole MA USA 02081
Document Number
OM-E-FC-360-30
Revision Level
Rev. 3
Prepared By
J.S. Bolio
Approved By
S. Titov
Effective date
8/15/2016
Operator’s Manual: HTI BioChem FC-360
Page 134 of 217
HIGH TECHNOLOGY, INC. PROPRIETARY AND CONFIDENTIAL
Photometric Accuracy
Photometric Accuracy means
similarity between the absorbance unit and the real absorbance of a
specific certified solution measured using reference standards.
The error while reading the absorbance of this solution regarding the certified value is called
Photometric inaccuracy
.
Required materials:
2 solutions of Potassium Dichromate in Perchloric Acid 0.001 N of different concentration and with
known and certified absorbance, measured using NIST Reference Standards Certificates (National
Institute of Standards and Technology). Example: solution A and B
Automatic pipette
Procedure:
1. Dispense manually 300 µl of the solution A in cuvette 3 or in any cuvette, indicating it on the
screen (Figure 12-29)
2. Dispense manually 300 µl of the solution B in cuvette 4 or in any cuvette, indicating it on the
screen (Figure 12-30)
3. Wait for 5 minutes to reach thermal stability of the solutions in the cuvette
4. Select
Maintenance
Validations
Photometric Accuracy
Cuvette number
OK
Cuvette Number
OK
Filter
OK
5. The instrument makes the readings of both solutions at the selected wavelength, reporting the
value in absorbance units AU.
6. Make the reading duplicate.
7. Calculate the % of photometric inaccuracy according to the following formula:
% Photometric inaccuracy = [measured abs
– reference abs] x 100
Reference abs.
Figure 12-30
Acceptable photometric inaccuracy: lower than 5.0%