Method - Hach DR/850 Procedures Manual

CHLORAMINE, MONO, High Range
Indophenol Method
1.
Enter the user
program number for
Chloramine, HR.
Press:
PRGM
The display will show:
PRGM?
Note: For most accurate
results, perform a Reagent
Blank Correction (Section
1 of the DR/800 Instrument
Manual).
5.
Wipe the outside of
the vial clean.
Place the vial into the
adapter. Cover the
sample vial tightly with
the instrument cap.
* U.S. Patent 6,315,950
*
For chlorinated drinking water and chlorinated wastewater
2.
Press:
111 ENTER
The display will show:
mg/L Cl
2
and then
Zero
Note: For alternate forms,
press the key.
CONC
6.
Press:
ZERO
The cursor will move to
the right and the display
will show:
0.0 mg/L Cl
2.
(0–10.0 mg/L Cl
3.
Insert the COD/TNT
Vial Adapter into the
cell holder by rotating
the adapter until it drops
in place. Push down to
fully insert it.
Note: For better
performance, adiffuser
band covers the light path
holes on the adapter. Do
not remove the band.
7.
Remove the vial
from the cell holder,
uncap, and add the
contents of one
Monochlor–F pillow to
the sample. Cap and
shake the vial about
20 seconds to dissolve.
Note: Use the microfunnel
as an aid in adding reagent
powder to the vial.
93
)

Method 10172

2
4.
Remove the cap
from one HR
Monochloramine
Diluent vial. Use a glass
pipet to add 2.0 mL of
sample to the vial.
Re-cap and invert
several times to mix.
8.
Press:
TIMER ENTER
A five-minute reaction
period will begin.