DETERMINACION DE HUMEDAD POR EL METODO DE KARL FISCHER PDF

These methods do not test for water absorption kinetics and equilibrium of plastics as measured by ISO Water content is an important parameter for processing materials and has to remain below the level specified in the appropriate material standard. Method A is an extraction method using anhydrous methanol followed by a Karl Fischer titration of the extracted water. The method can also be used for, e. Method B1 is a vaporization method using a tube oven. The water contained in the test portion is vaporized and carried to the titration cell by a dry air or nitrogen carrier gas, followed by a Karl Fischer titration of the collected water.

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These methods do not test for water absorption kinetics and equilibrium of plastics as measured by ISO Water content is an important parameter for processing materials and has to remain below the level specified in the appropriate material standard.

Method A is an extraction method using anhydrous methanol followed by a Karl Fischer titration of the extracted water. The method can also be used for, e. Method B1 is a vaporization method using a tube oven. The water contained in the test portion is vaporized and carried to the titration cell by a dry air or nitrogen carrier gas, followed by a Karl Fischer titration of the collected water. Method B2 is a vaporization method using a heated sample vial.

Method C is a manometric method. The water content is determined from the increase in pressure, which results when the water is evaporated under a vacuum. This method is not applicable to plastic samples containing volatile compounds, other than water, in amounts contributing significantly to the vapour pressure at room temperature. Checks for the presence of large amounts of volatile compounds are to be carried out periodically, for example by gas chromatography.

Such checks are particularly required for new types or grades of material. Check out our FAQs. This standard has been revised by ISO Life cycle A standard is reviewed every 5 years 00 Preliminary. Final text received or FDIS registered for formal approval. Proof sent to secretariat or FDIS ballot initiated: 8 weeks. Close of voting. Proof returned by secretariat. Got a question? Customer care. Keep up to date with ISO Sign up to our newsletter for the latest news, views and product information Subscribe.

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