Hach DR/700 - Page 707

81-33
Method 8190
PHOSPHORUS, TOTAL (0 to 3.50 mg/L)
For water, wastewater and seawater
PhosVer 3 and Acid Persulfate Digestion;
Test ’N Tube
™ Procedure
1. Turn on the COD
Reactor. Heat to
103 to 106
o
C. Place
the plastic shield in
front of the reactor.
Note: Ensure safety
devices are in place to
protect the analyst from
splattering should
leakage occur.
Note: See COD Reactor
manual for temperature
adjustment instructions.
2. Install module
81.01
in a DR/700.
Note: Refer to
Calibration following
these steps.
Note: Clean glassware
with 1:1 hydrochloric
acid solution. Rinse
again with
demineralized water.
Do not use detergents
containing phosphates
to clean glassware.
3. Press: I/O
The display will show
810 nm
and module
81.01