Hanna-instruments HI 83206 Manuel d'utilisateur télécharger pdf (Page 48)

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

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Hanna-instruments HI 83206 Manuel d'utilisateur Page 48