Hach DR/700 Procedures Manual page 147

PHOSPHORUS, REACTIVE,
10.
Place the
prepared sample in
the cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a 10-
mL cell. If the
10-mL cell is used for
the blank, another
10-mL cell must be used
for the sample
11.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L phosphate
(PO ). See Table 1 to
4
convert results to
other units.
Table 1. Conversion Factors
To convert reading from
3-
mg/L PO
4
3-
mg/L PO
4
42-63
continued
To Multiply by
mg/L P O
2 5
mg/L P
0.747
0.326