Accessories
SPECORD
®
Receptacle for cells with turbid samples
Note
In absorbance measurements, the pathlength is one of the crucial factors.
Therefore, it is important to insert all samples (samples and references) in the same
location and position. In this way, you can avoid measurement errors caused by angular
differences and parallel offset of the beam.
7.2
Receptacle for cells with turbid samples
In the measurement of strongly turbid samples, a considerable portion of the radiation
does not exit the sample cell straightly, but is scattered within a solid angle. For
photometrically accurate measurements it is necessary that the detector capture the total
scattered radiation. For this purpose, the sample and the reference substance must be
arranged as close to the detector as possible.
Therefore, the receptacles for the cells with scattering samples are located in the right-
hand sample-compartment wall of the SPECORD
®
in front of the photodiode detectors
(Fig. 4-5, 7 and 9 p.17). The receptacles can accommodate standard cells of 10 mm
pathlength.
1. Remove the foamed-plastic caps covering the cell receptacles and insert the cells
for the analysis.
2. After the measurement is finished, make sure to cover the cell receptacles again
with the foamed-plastic caps. If you fail to do so, extraneous light might be incident
on the detector and distort the results of the measurements.
Page 28
SPECORD
®
200/205/210/250 User's Manual – Edition 04/2005
Analytik Jena AG
