Hanna Instruments HI 83205-2008 - Manual (Page 29)

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• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown prior
to the measurement or, alternatively, wait for 6 minutes
and press READ. When the timer ends the meter will perform
the reading. The instrument displays concentration in mg/L
of nitrite.
• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of nitrogen-nitrite (NO
2
– -N) and sodium
nitrite (NaNO
2
).
• Press the or to go back to the measurement screen.
INTERFERENCES
Interference may be caused by the following ions:
ferrous, ferric, cupric, mercurous, silver, antimonious, bismuth, auric, lead, metavanadate and chloroplatinate.
Strongly reducing and oxidizing reagents.
High levels of nitrate (above 100 mg/L) could yield falsely high readings due to a minute amount of
reduction to nitrite that could occur at these levels.
Nitrite LR
SPECIFICATIONS
Range 0.00 to 0.35 mg/L
Resolution 0.01 mg/L
Accuracy ±0.02 mg/L ±4% of reading
Typical EMC ±0.01 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 525 nm
Method Adaptation of the EPA Diazotization method 354.1. The reaction between nitrite and
the reagent causes a pink tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93707-0 Powder reagent 1 packet
REAGENT SETS
HI 93707-01 Reagents for 100 tests
HI 93707-03 Reagents for 300 tests
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the Nitrite LR method using the procedure described
in the Method Selection section (see page 12).
• Fill the cuvette up to the mark with 10 mL of unreacted
sample (up to the mark) and replace the cap.
• Place the cuvette into the holder and close the lid.
• Press ZERO key. The display will show “-0.0-” when the
meter is zeroed and ready for measurement.
• Remove the cuvette.
• Add the content of one packet of HI 93707-0 reagent.
Replace the cap and shake gently for about 15 seconds.
Nitrite LR
NITRITE LOW RANGE
10 mL