Hach DR/850, Procedures Manual, Page: 363 / 460

363
Method 8048
PHOSPHORUS, REACTIVE
(0.00 to 5.00 mg/L PO
4
3- )
PhosVer 3 Method, Test ’N Tube Procedure
For water, wastewater, and seawater
USEPA accepted for reporting wastewater analysis
*
1.
Enter the stored
program number for
reactive phosphorus
(PO
4
3-
), Test ’N Tube.
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:
82 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.
Insert the COD/TNT
Adapter into the cell
holder by rotating the
adapter until it drops
into place. Then push
down to fully insert it.
Note: A diffuser band
covers the light path holes
on the adapter to give
increased performance.The
band should NOT be
removed.
4.
Use a TenSette Pipet
to add 5.0 mL of sample
to a Reactive
Phosphorus Test 'N Tube
Dilution Vial. Cap
and mix.
Note: For samples with
extreme pH, see the
Interference section.
* Procedure is equivalent to USEPA Method 365.2 and Standard Method 4500-P E for wastewater.