Hanna-instruments HI 904 Manual do Utilizador descarregar pdf (Página 70)

5-12

METHODS

5.5.9 Sample Parameters

This screen allows the user to access and configure the specific sample parameters.

5.5.9.1 Sample Determination

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

Normal

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

soluble in solvent and have homogeneous distribution in water.

External extraction

is a method for the preparation of insoluble samples that require a 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, preci-

sion, number of titrations between solvent changes and raising the cell maintenance

requirements.

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Hanna-instruments HI 904 Manual do Utilizador Página 70