34
35
• 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 46.
MEASUREMENT PROCEDURE
• Select the
Nitrite LR
method using the procedure described
in the
Method Selection
section (see page 11).
• 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
