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Matching sample cells
To decrease the effects that optical differences among sample cells can have on turbidity, transmittance or absorbance measurements, measure
samples in matched sample cells. It may not be possible to match all sample cells due to the differences in glass.
1. Rinse two or more
2. Clean the sample
clean, empty sample
cells with a soft, lint-free
cells two times with
cloth to remove water
dilution water and drain
spots and fingerprints.
to waste. Fill the
Do not invert the
sample cells to the line
sample cell.
(about 30 mL) with
filtered dilution water
and immediately put the
cap on the sample cell.
Refer to
Prepare
dilution water
on page 23.
Let the sample cell sit
for at least five minutes
to degas.
3. Apply a small bead
4. Use the oiling cloth
of silicone oil from the
provided to apply the oil
top to the bottom of the
equally to the surface of
sample cells.
the sample cells.
Remove the excess oil.
Make sure that the
sample cells are almost
dry.
5. Put the first sample
6. Remove the sample
cell in the sample cell
cell, turn it about
holder. Close the cover.
turn and put it in the
sample cell holder
Record the value when
again. Close the cover.
stable.
Record the value when
stable.
1
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of a
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English 21
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