Hanna Instruments HI 83099 User Manual

Page 44

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
completely 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 ▲ or ▼ to access the second level functions.
• Press the

Chem Frm key to convert the result in mg/L of nitrate (NO

¯).

• Press ▲ or ▼ to return 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

Nitrate

SPECIFICATIONS

Range

0.0 to 30.0 mg/L

Resolution

0.1 mg/L

Accuracy

±0.5 mg/L ±10% of reading at 25 °C

Typical EMC

±0.1 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 525 nm

Method

Adaptation of the cadmium reduction method. The reaction between nitrate and the
reagent causes an amber tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity

HI 93728-0

Powder reagent

1 packet

REAGENT SETS

HI 93728-01 Reagents for 100 tests
HI 93728-03 Reagents for 300 tests
For other accessories see page 132.

MEASUREMENT PROCEDURE

• Select the

Nitrate method using the procedure described in the

Method Selection section (see page 12).

• Using the pipette, fill the cuvette with 6 ml of sample, up to half of

its height, and replace the cap.

• Place the cuvette into the holder and close the lid.

• Press the

Zero key. The display will show “-0.0-” when the meter is zeroed and ready for

measurement.

• Remove the cuvette and add the content of one packet of

HI 93728-0 reagent.

6 mL

NITRATE