Hach DR/700 - Page 723

81-49
PHOSPHORUS, REACTIVE, continued
7. Fill a 10-mL cell
to the 10-mL line
with sample (the
blank).
8. Place the blank in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
9. Press: ZERO
The display will
count down to 0
Then the display will
show 0.00 mg/L, and
the zero prompt will
turn off.
10. Place the
prepared sample in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
11. Press: READ
The display will
count down to 0.
Then the display will
show the results in
mg/L phosphate
(as PO
4
).
Note: To convert results
to other units, see Table 1.
Table 1. Conversion Factors
To convert reading from To Multiply by
mg/L PO
4
mg/L P
2
O
5
0.747
mg/L PO
4
mg/L P 0.326