Hach DR/700 - Page 117

42-33
Method 8038
NITROGEN, AMMONIA (0 to 3.00 mg/L NH
3
-N)
For water, wastewater*, seawater*
Nessler Method**, EPA accepted for reporting
(distillation required)†
2. Press: I/O
The display will show
420 nm
and module number
42.01
3. After 2 seconds,
the display will show
a program number,
the concentration
units, decimal
position and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
42.05.1
*Requires distillation.
** Adapted from Standard Methods for the Examination of Water and Wastewater.
†Procedure is equivalent to USEPA Method 350.2 and Standard Method 4500-NH
3
B and C for wastewater.
1. Install module
42.01
in a DR/700.
Note: If samples cannot
be analyzed immediately,
see Sampling and
Storage following these
steps. Adjust the pH of
stored samples before
analysis.