Hach DR/850 Procedures Manual page 197

IRON, TOTAL,
5.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Fe
9.
Place the AccuVac
ampul into the cell
holder. Tightly cover the
ampul with the
instrument cap.
continued
6.
Fill a FerroVer
AccuVac Ampul
with sample.
Note: Keep the tip
immersed while the ampul
fills completely.
10.
Press:
READ
The cursor will move to
the right, then the result
in mg/L iron (Fe) will
be displayed.
Note: Standard Adjust may
be performed using a
prepared standard (see
Section 1).
7.
Quickly invert the
ampul several times to
mix. Wipe off any liquid
or fingerprints.
Note: An orange color will
form if iron is present.
Note: Accuracy is not
affected by undissolved
powder.
197
8.
Press:
TIMER ENTER
A three-minute reaction
period will begin.
Note: Samples containing
visible rust should be
allowed to react at least
five minutes.