Hach DR/700 Procedures Manual page 455

CHROMIUM, HEXAVALENT,
5 minutes
7.
Wait 5 minutes.
10.
Insert the
AccuVac Vial
Adapter into the cell
holder.
8.
Place the blank in
the cell holder.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
11.
Place the
prepared sample in
the cell holder.
Note: In bright light it
may be necessary to
close the cell
compartment cover.
Table 1. Conversion Factors
To convert results from
mg/L Cr 6+
mg/L Cr 6+
55-7
continued
9.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.000 mg/L and
the zero prompt will
turn off.
12.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L hexavalent
chromium (Cr
Note: To convert results
to other units, see Table 1.
To Multiply by
mg/L CrO 2- 2.23
4
mg/L Na CrO 3.12
2 4
6+
).