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PHOSPHORUS, ACID HYDROLYZABLE
PhosVer 3 with Acid Hydrolysis
Test 'N Tube
Procedure
™
1.
Turn on the COD
Reactor. Heat to 150 °C.
Note: See DRB200
instrument manual for
selecting preprogrammed
temperature applications.
5.
Use a TenSette Pipet
to add 5.0 mL of sample
to a Total and Acid
Hydrolyzable Test Vial.
Cap and mix.
2.
Enter the stored
program number for acid
hydrolyzable phosphorus
3-
(PO
), Test 'N Tube.
4
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
6.
Heat the vial in the
DRB200 Reactor for
30 minutes.
(0.00 to 5.00 mg/L PO
For water, wastewater, and seawater
3.
Press:
82 ENTER
The display will show
mg/L, PO4 and the
ZERO icon.
Note: For alternate forms
(P, P
O
), press the
2
5
CONC key.
7.
Carefully remove the
vial from the reactor.
Place it in a test tube
rack and allow to cool to
room temperature.
Note: Vials will be hot.
371
Method 8180
3-
)
4
4.
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.
8.
Remove the cap from
the vial. Use a TenSette
Pipet to add 2.0 mL of
1.00 N sodium
hydroxide to the vial.
Cap and mix.
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