103
• Remove the cuvet and add the content of one
packet of HI 93728 reagent.
• Replace the cap and im-
mediately shake vigorously
for exactly 10 seconds by
moving the cuvet up and
down. Continue to mix by
inverting the cuvet gently
and slowly for 50 seconds,
while taking care not to
induce air bubbles. A de-
posit remains, but this does
not affect the measurement. Time
and way of shaking could sensitively
affect the measurement.
• Reinsert the cuvet into the instrument,
taking care not to shake it.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 4 minutes and 30 seconds
and press READ DIRECT. In both cases "SIP" will blink during
measurement.
• The instrument directly displays concentration in mg/L of nitrate-
nitrogen on the Liquid Crystal Display.
• To convert the reading to mg/L of nitrate (NO
3
–
), multiply by a
factor of 4.43.
INTERFERENCES
Interference may be caused by:
Ammonia and amines, as urea and primary aliphatic amines
Chloride above 100 ppm (negative interference)
Chlorine above 2 ppm (positive interference)
Copper
Iron(III) (positive interference)
Strong oxidizing and reducing substances
Sulfide (it must be absent)
Nitrate
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