Hanna-instruments HI 83205-2008 Manual de usuario descargar pdf (Pagina 29)

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• Reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior

to the measurement or, alternatively, wait for 6 minutes

and press READ. When the timer ends the meter will perform

the reading. The instrument displays concentration in mg/L

of nitrite.

• Press the  or  to access the second level of functions.

• Press the Chem Frm functional key to convert the result in mg/L of nitrogen-nitrite (NO

–

-N) and sodium

nitrite (NaNO

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

INTERFERENCES

Interference may be caused by the following ions:

ferrous, ferric, cupric, mercurous, silver, antimonious, bismuth, auric, lead, metavanadate and chloroplatinate.

Strongly reducing and oxidizing reagents.

High levels of nitrate (above 100 mg/L) could yield falsely high readings due to a minute amount of

reduction to nitrite that could occur at these levels.

Nitrite LR

SPECIFICATIONS

Range 0.00 to 0.35 mg/L

Resolution 0.01 mg/L

Accuracy ±0.02 mg/L ±4% of reading

Typical EMC ±0.01 mg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 525 nm

Method Adaptation of the

EPA Diazotization method 354.1

. The reaction between nitrite and

the reagent causes a pink tint in the sample.

REQUIRED REAGENTS

Code Description Quantity

HI 93707-0 Powder reagent 1 packet

REAGENT SETS

HI 93707-01 Reagents for 100 tests

HI 93707-03 Reagents for 300 tests

For other accessories see page 73.

MEASUREMENT PROCEDURE

• Select the

Nitrite LR

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 (up to the mark) 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 93707-0 reagent.

Replace the cap and shake gently for about 15 seconds.

Nitrite LR

NITRITE LOW RANGE

10 mL

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 38 39

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Hanna-instruments HI 83205-2008 Manual de usuario Pagina 29

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