DR/2400
Nitrogen, Total
NitrogenTot_UniCell_Other_PSD_Eng_Ody.fm Page 1 of 6
• Warm the sample to room temperature and adjust pH between pH 4–9 with 5.0 N Sodium Hydroxide Standard Solution
before testing.
• Do not use mercury compounds as preservatives.
• Clean the outside of the vial before placing it in the instrument. Wipe with a damp towel followed with a dry one to remove
fingerprints and other marks.
• Use the standard solution or standard addition method to verify results. See Accuracy Check on page 3.
• See Adjusting the Standard Curve on page 40 in the procedure manual for information on adjusting the calibration curve.
Nitrogen, Total
Persulfate Digestion Method
UniCell™ Vials
Scope and Application: For water and wastewater
(5.0 to 40.0 mg/L N (TN
b
)
1. Touch
Hach Programs.
Select program
800 N, Total, HCTIII.
Touch Start.
2. Pipet 0.5 mL of
sample into a reaction
tube (red cap).
Note: Quickly complete
steps 3 through 5!
3. Immediately add
2.0 mL of Sodium
Hydroxide Solution A
(HCT 111 A) to the
reaction tube.
4. Immediately add 1
Oxidant Tablet B
(HCT 111 B). Close the
reaction tube.
Do not invert.
Tips and Techniques
UniCell Vials
Hach ProgramsHach Programs
To Next Page
Loading...
