Hanna-instruments HI 83205-2008 Manual de usuario descargar pdf (Pagina 27)

52 53

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

Nitrate

SPECIFICATIONS

Range 0.0 to 30.0 mg/L

Resolution 0.1 mg/L

Accuracy ±0.5 mg/L ±10% of reading

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 73.

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 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

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