Hach DR/700 Procedures Manual page 539

QUATERNARY AMMONIUM COMPOUNDS
(0 to 5.0 mg/L)
For water, wastewater, cooling tower and pool/spa water
Direct Binary Complex Method
1.
Install module
57.01
in a DR/700.
4.
Fill a 25-mL cell
to the 25-mL line
with demineralized
water (the blank).
Note: For proof of
accuracy, use a 4 mg/L
cetyltrimethyl
ammonium bromide
(CTAB) Standard
Solution (preparation in
the Accuracy Check) in
place of the sample.
2.
Press:
I/O
The display will show
575 nm
and module number
57.01
5.
Add the contents
of one Q.A.C.
Reagent 1 powder
pillow. Cap and
invert to mix.
Remove cap after
mixing.
Note: Shaking the cell
will cause air bubble
turbidity which
dissipates slowly and
interferes with test
results.
57-33
Method 8337
3.
After 2 seconds,
the display will show
a program number,
concentration units
and the zero prompt.
If necessary, press the
key until
UP ARROW
the lower display
shows program
number
57.07.1
6.
Add the contents
of one Q.A.C.
Reagent 2 powder
pillow. Cap and
invert to mix.