DR/2400
Nitrogen, Ammonium
NitrogenAmm_UniCell_SAL_Eng_Ody.fm Page 1 of 4
• Adjust the pH of preserved samples to between pH 4–9 before testing.
• Clean the outside of the vial before placing it in the instrument. Wipe with a damp towel, followed by a dry one.
• Use the standard solution or standard addition method to verify results (see Accuracy Check).
• See Section 3.2.4 on page 40 for information on adjusting the calibration curve.
• Make sure that the temperature of the water sample and the sample vial is 20 °C. Temperature will affect the color of the reaction
and may give inaccurate results.
• Analyze the sample between 15 and 30 minutes after the reaction begins. The final color and final absorbance are reached after
a reaction time of 15 minutes and remain constant for another 15 minutes.
• Underrange appears on the display when the instrument is zeroed or when the determined sample concentration is below the
operating range listed for this method.
Nitrogen, Ammonium
Salicylate Method
UniCell™ Vials
Scope and Application: For water, wastewater, surface water,
swimming pool water, and process control
(1.5 to 45.0 mg/L NH
4
+
)
1. Touch
Hach Programs.
Select program
801 Ammonium, HCT 102.
Touch
Start.
2. Add 0.2 mL of sample
to one sample vial.
3. Immediately screw a
light green UniCap A
(HCT 100-104 A) onto the
sample vial.
Close the UniCap A bottle
immediately after use.
4. Invert the sample vial
repeatedly until the solid
reagent in the cap is
dissolved.
Tips and Techniques
UniCell Vials
Hach ProgramsHach Programs
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