Hanna-instruments HI 83214 Manual de usuario descargar pdf (Pagina 29)

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

measurement.

• Remove the vial.

• Remove the cap and add the content of one packet of HI 93766-0 Nitrate

Reagent.

• Replace the cap tightly and invert the vial 10 times. This is the reacted

sample.

Note: The method is technique sensitive: to obtain most reproducible results

it is strongly recommended to follow carefully the “invert” procedure

described on page 10.

• Place the vial into the holder and push it completely down.

• Press Timer and the display will show the countdown prior to the measurement and the ”Reaction

Time” message. Alternatively, wait for 5 minutes and press Read. The instrument will perform the

reading.

• The instrument displays concentration in mg/L of nitrate-nitrogen (NO

-N). Press s or t to

convert the result in mg/L of nitrate (NO

INTERFERENCES

Interference may be caused by:

Barium (Ba

) above 1 mg/L

Chloride (Cl

) above 1000 mg/L

Nitrite (NO

) above 50 mg/L

Samples containing up to 100 mg/L nitrite may be measured after the following treatment: add 400 mg

of urea to 10 mL of sample, mix until completely dissolved, then proceed with the usual measurement

procedure.

Nitrate

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Hanna-instruments HI 83214 Manual de usuario Pagina 29