Hanna Instruments HI 83214 - Manual (Page 32)

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Nitrogen, Total LR
• Replace the cap tightly and shake the vials vigorously for about 30 seconds until all the powder is
completely dissolved.
• Insert the vials into the reactor and heat them for 30 minutes at 150 °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 period switch off the reactor, place the vials in the
test tube rack and allow to cool to room temperature.
Warning: The vials are still hot, be careful in handling them.
• Select Nitrogen, Total LR 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.
• Remove the cap from the vials and add the content of one packet of HI 93767-0 Total Nitrogen
Reagent to each vial. Replace the cap tightly and shake gently the vials for 15 seconds.