Hach DR/850 - NITROGEN, AMMONIA Salicylate Method

259
Method 8155
NITROGEN, AMMONIA (0 to 0.50 mg/L NH
3
-N) For water, wastewater, seawater
Salicylate Method
*
1. Enter the stored
program number
for ammonia nitrogen
(NH
3
-N).
Press:
PRGM
The display will show:
PRGM ?
2. Press: 64 ENTER
The display will show
mg/L, NH3-N and the
ZERO icon.
Note: For alternate forms
(NH
3
, NH
4
), press the
CONC key.
3. Fill a sample cell
with 10 mL of deionized
water (the blank).
4. Fill a second sample
cell with 10 mL of
the sample.
5. Add the contents of
one Ammonia Salicylate
Reagent Powder Pillow
to each sample cell. Cap
both cells and shake
to dissolve.
6. Press:
TIMER ENTER
A three-minute reaction
period will begin.
7. After the timer beeps
add the contents of one
Ammonia Cyanurate
Reagent Powder Pillow
to each sample cell. Cap
the cells and shake to
dissolve the reagent.
Note: A green color will
develop if ammonia
nitrogen is present.
8. The display will
show: 15:00 TIMER 2
Press:
ENTER
A 15-minute reaction
period will begin.
* Adapted from Clin. Chim. Acta., 14 403 (1966)