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SURFACTANTS, ANIONIC,
9.
After the timer
beeps, remove the
stopper and drain the
bottom water layer.
Discard this layer.
Note: Benzene solutions
are a regulated waste and
cannot be poured down the
drain. See Section 3 for
proper disposal of these
materials.
13.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.000 mg/L LAS
continued
10.
Drain the top
benzene layer into a
clean sample cell (the
prepared sample).
Note: The benzene layer
cannot be filtered before
color measurement.
Filtration removes the
blue color.
14.
Place the prepared
sample into the cell
holder. Tightly cover the
sample cell with the
instrument cap.
11.
Fill another sample
cell to the 25-mL mark
with pure benzene
(the blank).
15.
Press:
READ
The cursor will move to
the right, then the result
in mg/L anionic
surfactants (LAS) will
be displayed.
Note: Standard Adjust may
be performed using a
prepared standard (see
Standard Adjust in
Section 1).
Note: Acetone may be used
to clean benzene from
glassware.
418
12.
Place the blank in
the cell holder. Tightly
cover the sample cell
with the instrument cap.
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