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ALUMINUM,
7.
Put 1 drop of ECR
Masking Reagent
Solution into a 10-mL
sample cell.
10.
Fill a second
10-mL cell to the
10-mL line with the
remaining solution in
the cylinder (the
prepared sample).
Cap.
continued
8.
Fill the sample
cell to the 10-mL
mark with the
solution from the
cylinder (the blank).
Cap and invert several
times to mix.
Note: The solution will
start to turn yellow.
11.
Within five
minutes after the
5-minute waiting
period, place the
blank in the cell
holder.
Note: In bright light, it
may be necessary to
close the cell
compartment cover.
52-13
5 minutes
9.
Wait 5 minutes.
12.
Press:
ZERO
The display will
count down to 0.
Then the display will
show
0.000 mg/L
and the zero prompt
will turn off.
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