Hanna Instruments HI 83214 - Manual (Page 37)

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Nitrogen, Total HR
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• Replace the cap tightly and shake vigorously the vials for about 30 seconds until all the powder is
completely dissolved.
• Insert the vials into the reactor and heat them for 30 minutes at 105 °C.
Note: To obtain most accurate results, it is strongly recommended to
remove the vials from the reactor after 30 minutes.
• At the end of the digestion place the vials in the test tube rack and allow to
cool to room temperature.
Warning: As the vials are still hot, be careful in handling them.
• Select Nitrogen, Total HR method following one of the procedures described in the “Method Selection”
section (see page 15).
• For this method the instrument provides 3 reaction timers which can be used throughout the procedure.
• Remove the cap from the vials and add the content of one packet of Sodium Metabisulfite for Total
Nitrogen analysis to each vial. Replace the cap tightly and shake gently the vials for 15 seconds.
• Press Timer to start the 3 minutes timer or wait for 3 minutes (without shaking the vials) to allow the
reaction to complete.