Table of Contents
Advertisement
DR/2400
UniCell™ Vials
Scope and Application:
swimming pool water, and process control
Tips and Techniques
• 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.
UniCell Vials
Hach Programs
Hach Programs
1.
Touch
.
Hach Programs
Select program
801 Ammonium, HCT 102
Touch
.
Start
NitrogenAmm_UniCell_SAL_Eng_Ody.fm
For water, wastewater, surface water,
2.
Add 0.2 mL of sample
to one sample vial.
.
Nitrogen, Ammonium
3.
Immediately screw a
light green UniCap A
(HCT 100-104 A) onto the
sample vial.
Close the UniCap A bottle
immediately after use.
Salicylate Method
(1.5 to 45.0 mg/L NH
4.
Invert the sample vial
repeatedly until the solid
reagent in the cap is
dissolved.
Nitrogen, Ammonium
Page 1 of 4
+
)
4
Advertisement
Table of Contents
