Hanna-instruments HI 903 Manual do Utilizador descarregar pdf (Página 77)

5-13

METHODS

5.5.10.1 Sample Determination

This screen allows the user to select the sample determination mode.

Normal

sample determination is performed through direct titration of samples that are soluble

in solvent or are finely divided and have homogeneous distribution in water.

External extraction

is a method for the preparation of insoluble samples that require an

external water extraction. Using the proper solvents the sample is broken down into a fine

suspension from which, the water is extracted and released into the solvent.

External dissolution

is a method for the preparation of the following types of samples:

• samples with a very high water content.

• samples that do not exhibit a homogeneous water distribution.

• slow-dissolving samples

• samples that can contaminate the titration vessel, thus reducing the accuracy, precsion,

number of titrations between solvent changes and raising the cell maintenance

requirements.

5.5.10.2 Sample Name

This screen allows the user to enter a name for the sample (up to 14 characters). Use the

arrow keys to navigate through the character table. Press to add the highlighted

character to the sample name.

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Hanna-instruments HI 903 Manual do Utilizador Página 77