Hanna Instruments HI 83214 - Manual (Page 53)

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Phosphorus, Acid Hydrolyzable
• Press the Zero key. The instrument will perform a zero sequence and after a few seconds the display
will show “ -0.0-”. Now the meter is zeroed and ready for measurement.
• Remove the vial.
• Remove the cap and add the content of one packet of HI 93758-0
Phosphorus Reagent.
• Replace the cap tightly and shake gently to mix for 2 minutes until
most of the powder is dissolved. This is the sample.
• 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 3 minutes and press Read.
• The instrument will perform the reading. The instrument displays concentration in mg/L of phosphorus
(P).
The method detects free (orthophosphate) and condensed inorganic forms (meta-, pyro- and other
polyphosphates) of phosphates present in the sample.
• Press ▲ or ▼ to convert the result in mg/L of phosphate (PO
4
3
-) or mg/L of P
2
O
5
.
Note: For accurate measurements
1) wash glassware only with phosphate-free detergents
2) clean all glassware with 1 : 1 hydrochloric acid solution and rinse with deionized water.