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NITROGEN, AMMONIA,
e) Turn on the heater power switch. Set the stir control to 5 and the heat
control to 10. Turn on the water and adjust to maintain a constant flow
through the condenser.
f) Turn off the heater after collecting 150 mL of distillate. Immediately
remove the collection flask to avoid sucking solution into the still.
Measure the distillate to assure 150 mL was collected (total volume
175 mL).
g) Adjust the pH of the distillate to about 7 with 1 N sodium hydroxide.
Use a pH meter.
h) Pour the distillate into a 250-mL volumetric flask. Rinse the
erlenmeyer with several small volumes of demineralized water and add
the rinsings to the volumetric flask. Dilute to the mark. Stopper. Mix
thoroughly. Analyze as described above.
SUMMARY OF METHOD
The Mineral Stabilizer complexes hardness in the sample. The
Polyvinyl Alcohol Dispersing Agent aids the color formation in the
reaction of Nessler Reagent with ammonium ions. A yellow color is
formed proportional to the ammonia concentration.
REQUIRED REAGENTS
Description
Nessler Reagent. . . . . . . . . . . . 2 mL . . . . . . 500 mL . . . . . . . 21194-49
Mineral Stabilizer . . . . . . . . . . 6 drops . . . . . 59 mL* SCDB . . 23766-26
Polyvinyl Alcohol
Dispersing Agent . . . . . . . . 6 drops . . . . . 59 mL* SCDB . . 23765-26
Water, demineralized . . . . . . . . 25 mL . . . . . 4 L . . . . . . . . . . . . . 272-56
REQUIRED APPARATUS
DR/700 Filter Module
Number 42.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46242-00
Pipet, 1 mL . . . . . . . . . . . . . . . 2 . . . . . . . . . each . . . . . . . . . . . 515-35
Pipet Filler, safety bulb . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 14651-00
continued
Quantity
Per Test
Unit
42-38
Cat. No.
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