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IRON, TOTAL,
Using AccuVac Ampuls
1.
Enter the stored
program number for iron
(Fe)- AccuVac Ampuls.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
Note: Adjust the pH of
stored samples before
analysis.
5.
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.
continued
2.
Press:
39 ENTER
The display will show
mg/L, Fe and the
ZERO icon.
Note: Total iron
determination needs a
prior digestion. Use any of
the three procedures in
Digestion (Section 2).
6.
Press:
TIMER ENTER
A three-minute reaction
period will begin.
3.
Fill a sample cell
with at least 10 mL of
sample (the blank).
Collect at least 40 mL of
sample in a 50-mL
beaker.
Note: Sample pH is
important in this test; see
Interferences.
Note: Rinse glassware with
a 1:1 hydrochloric acid and
deionized water before use
to avoid errors due to iron
deposits on the glass.
7.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
209
4.
Fill a TPTZ Iron
AccuVac Ampul
with sample.
Note: Keep the tip
immersed while the ampul
fills completely.
8.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Fe
Note: Press EXIT to zero
the instrument while the
timer is running.
Note: If Reagent Blank
Correction is on, the
display may flash "limit".
See Section 1.
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