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ISO 787-4:1981
General methods of test for pigments and extenders — Part 4: Determination of acidity or alkalinity of the aqueous extract
Automatically translated name:
General methods of test for pigments and extenders -- Part 4: Determination of acidity or alkalinity of the aqueous extract
STANDARD published on 1.9.1981
The information about the standard:
Designation standards: ISO 787-4:1981
Publication date standards: 1.9.1981
SKU: NS-435291
The number of pages: 2
Approximate weight : 6 g (0.01 lbs)
Country: International technical standard
Category: Technical standards ISO
The category - similar standards:
Annotation of standard text ISO 787-4:1981 :
Description / Abstract: 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.
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