Hanna-instruments HI 901 Manual do Utilizador descarregar pdf (Página 49)

5-9

METHODS

Back Titration

A titration with a pH or mV equivalence point detection, consisting of two titration phases:

 Phase 1  the sample is consumed by a known volume and concentration of titrant 1.

A sufficient amount of titrant 1 is dispensed to surpass the equivalence point in order

to react quickly with the sample.

 Phase 2  the excess of titrant 1 is titrated with the titrant 2 to the equivalence point.

Finally, the concentration of the sample will be determined.

Also, if the Back Titration option is chosen, the following settings must be selected:

 Titrant 1 pump: select the pump used in phase 1 of the titration (Pump 1).

 Titrant 2 pump: select the pump used in phase 2 of the titration (Pump 2).

 Break at titrant changing: select YES to stop titration temporarily, between the first and

the second phase of the back titration (you can do some tasks in order to perform the

analysis: eg. boiling the sample in order to evaporate the carbon dioxide).

5.5.3 Dosing Type

The Titrator allows two dosing types: Linear Dosing and Dynamic Dosing.

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Hanna-instruments HI 901 Manual do Utilizador Página 49