Hanna-instruments HI 83214 Manual do Utilizador descarregar pdf (Página 53)

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 s or t to convert the result in mg/L of phosphate (PO

) or mg/L of P

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.

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Hanna-instruments HI 83214 Manual do Utilizador Página 53