Hach POCKET COLORIMETER II Instruction Manual page 19

10.
Subtract the reagent
blank from the reading for
true concentration.
Phosphorus, Reactive,
To convert reading
from
mg/L PO
mg/L PO
To convert results to
Note:
other units, use the
conversion table (Table 1).
1—19
Table 1
To
3– mg/L P O
2
4
3– mg/L P
4
continued
Multiply by
0.747
5
0.326