ISO 787-4:1981 PDF

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General methods of test for pigments and extenders — Part 4: Determination of acidity or alkalinity of the aqueous extract

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The principle of the method consists in the hot extraction of the material by following the procedure specified in ISO 787/3, to the stage of obtaining a perfectly clear filtrate. The determination is carried out with indicator solution (method A). If the solution with the methyl red indicator is yellow (alkaline), titrate it with the hydrochloric acid solution to an orange end-point; if the solution with the methyl red indicator is red (acid), titrate it with the sodium or potassium hydroxide solution to an orange end-point. The other method (method B) is the potentiometric determination. Take 100 ml of the test solution, insert the electrodes of the pH measuring device and read the pH value.

Edition

1981

Standard Part No

4

Published Date

1981

Published By

International Standardization Organisation

Page Count

2

ISO 787-4:1981 PDF
$43.00 Original price was: $43.00.$33.54Current price is: $33.54.