Hanna Instruments HI 83206-2008 User Manual

Page 25

Nitrite HR

NITRITE HIGH RANGE

SPECIFICATIONS

Range

0 to 150 mg/L

Resolution

1 mg/L

Accuracy

±4 mg/L ±4% of reading

Typical EMC

±1 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 575 nm

Method

Adaptation of the Ferrous Sulfate method. The reaction between nitrite and the

reagent causes a greenish-brown tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity

HI 93708-0

Powder reagent

1 packet

REAGENT SETS

HI 93708-01 Reagents for 100 tests
HI 93708-03 Reagents for 300 tests
For other accessories see page 73.

MEASUREMENT PROCEDURE

• Select the

Nitrite HR 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 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 93708-0 reagent. Replace

the cap and shake gently until completely dissolved.

10 mL

Nitrate

• Replace the cap and immediately shake vigorously up

and down for exactly 10 seconds. Continue to mix by

inverting the cuvette gently for 50 seconds, while taking

care not to induce air bubbles. Powder will not com-
pletely dissolve. Time and way of shaking could sensitively

affect the measurement.

• Reinsert the cuvette 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. When the timer ends
the meter will perform the reading. The instrument

displays the results in mg/L of nitrate-nitrogen.

• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of nitrate (NO

• Press the or to go back to the measurement screen.

INTERFERENCES

Interference may be caused by:

Ammonia and amines, as urea and primary aliphatic amines

Chloride above 100 ppm

Chlorine above 2 ppm

Copper

Iron(III)

Strong oxidizing and reducing substances
Sulfide must be absent