Hanna Instruments HI 83214 - Manual (Page 29)

29
• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the vial.
• Remove the cap and add the content of one packet of HI 93766-0 Nitrate
Reagent.
• Replace the cap tightly and invert the vial 10 times. This is the reacted
sample.
Note: The method is technique sensitive: to obtain most reproducible results
it is strongly recommended to follow carefully the “invert” procedure
described on page 10.
• Place the vial into the holder and push it completely down.
• Press
Timer and the display will show the countdown prior to the measurement and the ”Reaction
Time” message. Alternatively, wait for 5 minutes and press Read. The instrument will perform the
reading.
• The instrument displays concentration in mg/L of nitrate-nitrogen (NO
3
--N). Press ▲ or ▼ to
convert the result in mg/L of nitrate (NO
3
-).
INTERFERENCES
Interference may be caused by:
Barium (Ba
2+ ) above 1 mg/L
Chloride (Cl-) above 1000 mg/L
Nitrite (NO
2
-) above 50 mg/L
Samples containing up to 100 mg/L nitrite may be measured after the following treatment: add 400 mg
of urea to 10 mL of sample, mix until completely dissolved, then proceed with the usual measurement
procedure.
Nitrate