Hanna Instruments HI 83214 - Manual (Page 52)

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Phosphorus, Acid Hydrolyzable
• Remove the cap from a Reagent Vial.
• Add exactly 5.0 mL of sample to the vial, while keeping the vial at a
45-degree angle.
• Replace the cap and mix by inverting the vial a couple of times.
• Insert the vial into the reactor and heat it for 30 minutes at 150 °C.
• At the end of the digestion place the vials carefully in the test tube rack and
allow to cool to room temperature.
Warning: The vials are still hot, be careful when handling them.
• Select the Phosphorus, Acid Hydrolyzable method following one of the procedures described in the
“Method Selection” section (see page 15).
• Remove the cap from the vial and add exactly 2.0 mL of
Sodium Hydroxide (NaOH) Solution 1.20 N, while keeping
the vial at a 45-degree angle.
• Replace the cap tightly and mix by inverting the vial a
couple of times. This is the blank.
• Place the vial into the holder and push it completely down.