Hach DR/850 - PHOSPHORUS, REACTIVE, (Also called Orthophosphate) PhosVer 3 (Ascorbic Acid) Method

347
Method 8048
PHOSPHORUS, REACTIVE (0 to 2.50 mg/L PO
4
3-
) For water, wastewater, seawater
(Also called Orthophosphate) PhosVer 3 (Ascorbic Acid) Method
*
(Powder Pillows or AccuVac Ampuls) USEPA Accepted for wastewater analysis reporting
**
Using Powder Pillows
* Adapted from Standard Methods for the Examination of Water and Wastewater.
** Procedure is equivalent to USEPA method 365.2 and Standard Method 4500-PE for wastewater.
1. Enter the stored
program number for
reactive phosphorus,
ascorbic acid method.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2. Press: 79 ENTER
The display will show
mg/L, PO4 and the
ZERO icon.
Note: For alternate forms
(P, P
2
O
5
), press the CONC
key.
3. Fill a sample cell
with 10 mL of sample.
Note: For samples with
extreme pH, see
Interferences following
these steps.
Note: Clean glassware
with 1:1 HCl. Rinse again
with deionized water. Do
not use detergents
containing phosphates to
clean glassware.
4. Add the contents of
one PhosVer 3
Phosphate Powder
Pillow for 10-mL
sample to the cell (the
prepared sample). Shake
for 15 seconds.
Note: A blue color will
form if phosphate is
present.