Hach DR/700 - Page 539

57-33
Method 8337
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.
2. Press: I/O
The display will show
575 nm
and module number
57.01
3. After 2 seconds,
the display will show
a program number,
concentration units
and the zero prompt.
If necessary, press the
UP ARROW key until
the lower display
shows program
number
57.07.1
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.
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.
6. Add the contents
of one Q.A.C.
Reagent 2 powder
pillow. Cap and
invert to mix.