Hanna-instruments HI 901 Bedienungsanleitung PDF herunterladen (Seite 75)

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METHODS

If the titrant 1 unit is selected as M (mol/L), titrant 2 unit is selected as M (mol/L) and the

final result unit as mg/g (milligrams/gram) the following formula is used to calculate the

amount of titrant 1 (used in the first stage of back titration or direct titration) and will be as

follows:

The formula is based on an approximation: the sample concentration is 100% w/w.

With this approximation, the titrator will calculate the volume of titrant 1 needed to consume

the sample and multiply it with an excess factor in order to raise or to lower the amount of

titrant 1 dispensed.

Some variables can be set according to the amount of sample and titrant 1 used.

When the parameters from the formula are set, press to proceed with the next

formula used in the back titration algorithm.

If you do not want to use the Calc. Direct Titr. Volume formula, then from the View / Modify

Method screen:

 highlight the Titrant 1 Entry option, press .

 highlight Fixed Weight or Volume option and press , you will be prompted to

type the volume of titrant 1 to be dispensed in the first stage of back titration.

This formula is used to calculate the remaining volume of titrant 1 after the reaction with the

sample.

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Hanna-instruments HI 901 Bedienungsanleitung Seite 75