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Applicable to products having boiling points lower than or equal to 150 0C. The lower limit of detection is 1 mg/100 ml. Based on evaporation of a test portion in a weighed dish, and determination of the increase in mass of the dish, which represents the residue.
Aromatic hydrocarbons; Determination of residue on evaporation of products having boiling points up to 150 degrees C
This International Standard sprcifies a gas chromatographic method for the determination of traces carbon monoxide and carbon dioxide in ethyiene and propylene for industrial use. The method is applicable to products having carbon monoxide concentrations greater than 0.1ml/m3 and carbon dioxide concentrations greater than 0.5ml/m3.
Ethylene and propylene for industrial use; Determination of traces of carbon monoxide and carbon dioxide; Gas chromatographic method
Light olefins for industrial use; Determination of impurities by gas chromatography; General considerations
Light olefins for industrial use; Determination of ammonia; Photometric method
Toluene; Determination of hydrocarbon impurities; Gas chromatographic method
Essential oils; Determination of ester value after acetylation and evaluation of free alcohols and total alcohols content
Aromatic hydrocarbons; Test for presence of mercaptans (thiols); Doctor test
Mixing a test portion to which a mixed indicator (bromocresol green/alizarin red S) has been added with water by shaking. Comparison of the colour of the aqueous layer with that of a neutral solution of the indicator.
Aromatic hydrocarbons; Test for neutrality
Specifies an acid washing test. Gives some indication of the degree of refining but does not give a precise measure of the amount of unsaturated compounds present as different unsaturated compounds produce different colourations with sulphuric acid. Shaking together of equal volumes of the sample and 95 % (m/m) sulphuric acid. Comparison of the colour of the acid layer with that of standard matching solutions.
Aromatic hydrocarbons; Acid-wash test
Essential oils; Determination of phenols content
Essential oils; Determination of the acid value
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