Phosphorus, Reactive, Amino Acid Method - Hach DR/850 Procedures Manual

PHOSPHORUS, REACTIVE
Amino Acid Method
1.
Enter the stored
program number for
reactive phosphate
3-
(PO ), amino acid
4
method.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
* Adapted from Standard Methods for the Examination of Water and Wastewater.
(0 to 30.0 mg/L PO
*
2.
Press:
85 ENTER
The display will show
mg/L, PO4 and the
ZERO icon.
Note: For alternate forms
(P, P O ), press CONC.
2 5
3-
)
4
For water, wastewater, seawater
3.
Fill a 25-mL sample
cell with 25 mL of sample.
387
Method 8178
4.
Add 1 mL of
Molybdate Reagent using
a 1-mL calibrated dropper.