Hach DR/700 Procedures Manual page 517

IRON, TOTAL
For water, wastewater and seawater
TPTZ Method* (Powder Pillows or AccuVac Ampuls)
USING POWDER PILLOWS
1.
Install module
57.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage,
below. Adjust pH of
stored samples before
analysis.
Note: Total iron
determination needs a
prior digestion. Use
any of the three
procedures given in
Digestion (Section I).
*Adapted from G. Frederick Smith Chemical Co., The Iron Reagents, 3rd ed. (1980)
(0 to 1.00 mg/L)
2.
Press: I/O
The display will show
575 nm
and module
57.01
57-11
Method 8112
3.
After 2 seconds
the display will show
a program number,
concentration units,
the decimal position
and the zero prompt.
If necessary, press the
key
UP ARROW
until the lower
display shows
program number
57.03.1
Note: Rinse glassware
with a 1:1 Hydrochloric
Acid Solution. Rinse
again with
demineralized water.
These two steps will
remove iron deposits
which can cause slightly
high results.