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IRON, TOTAL,
4.
Fill a cell with 10
mL of sample (the
blank). Cap. Collect
at least 40 mL of
sample in a 50 mL
beaker.
Note: For proof of
accuracy, a 0.4 mg/L
iron standard solution
(preparation given in
the Accuracy Check)
can be used in place of
the sample.
Note: Sample pH is
important in this test; see
pH discussion in
Interferences (Section I).
3 minutes
7.
Wait 3 minutes.
continued
5.
Fill a TPTZ Iron
AccuVac Ampul with
sample.
Note: Keep tip
immersed while the
ampul fills completely.
8.
Place the blank in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
57-16
6.
Invert the ampul
(the prepared sample)
repeatedly to mix.
Wipe off any liquid or
fingerprints.
Note: A blue color will
develop if iron is
present.
9.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.
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