Hach DR/850, Procedures Manual, Page: 195 / 460

195
Method 8008
IRON, TOTAL
(0 to 3.00 mg/L) For water, wastewater, and seawater
FerroVer Method
(Powder Pillows or AccuVac Ampuls)
USEPA approved for reporting wastewater analysis (digestion is required; see Section 2
*
)
1.
Enter the stored
program number for iron
(Fe) powder pillows.
Press:
PRGM
The display will show:
PRGM ?
Note: Determination of
total iron requires a
digestion prior to analysis
(see Section 2).
Note: Adjust pH of stored
samples before analysis.
2.
Press:
33 ENTER
The display will show
mg/L, Fe and the
ZERO icon .
3.
Fill a clean sample
cell with 10 mL
of sample (the blank).
Note: For turbid samples,
treat the blank with one
0.1-gram scoop of RoVer
Rust Remover. Swirl to mix.
4.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
5.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Fe
6.
Fill another sample
cell with 10 mL
of sample.
7.
Add the contents of
one FerroVer Iron
Reagent Powder Pillow
to the sample cell (the
prepared sample). Cap
and invert to dissolve the
reagent powder.
Note: Accuracy is not
affected by undissolved
powder.
8.
Press:
TIMER ENTER
A three-minute reaction
period will begin.
Note: An orange color will
form if iron is present.
Note: Samples containing
visible rust should be
allowed to react at least
five minutes.
* Federal Register , 45 (126) 43459 (June 27, 1980). See also 40 CFR, part 136.3, Table IB.