71.080.70 - Esters

The free alcohol is reacted with vanadium(V) sodium salt of quinolin-8-ol(8-hydroxyquinoline) to form a coloured complex. The complex is extracted with toluene and then treated with dichloroacetic acid. The spectrometric measurement is carried out at a wavelength of about 620 nm. The method is applicable to products having free alcohol contents between 0,01 and 5,0 % (m/m).

Gives general instructions and specifies methods of analysis for these chemical products. The methods are the following: determination of density at 20 °C; determination of dry residue after evaporation on a water bath; measurement of colour; determination of distillation characteristics; determination of water content; determination of acidity; and determination of ester content (titrimetric method). - Cancels and replaces ISO Recommendation R 1386-1970 and constitutes a technical revision thereof.

The method is not applicable to diallyl phthalate because of the risk of explosive polymerization. The procedure is carried out by the method specified in ISO 2211. The result is expressed in Hazen units (platinum-cobalt scale). - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970.

The principle consists in titration of the acidity in a test portion, in ethanolic medium, with standard volumetric sodium hydroxide solution using phenolphthalein as indicator. - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970.

The document also specifies the methods to be used for the following tests: measurements of colour; determination of density at 20 °C; determination of water content; determination of iodine value (applicable to diallyl phthalate only); determination of refractive index; determination of flash point; determination of viscosity (not applicable to diallyl phthalate). - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970.

The principle consists in the saponification of ester in a test portion, using a measured excess of potassium hydroxide ethanolic solution, followed by back-titration with standard volumetric hydrochloric acid solution in the presence of phenolphthalein as indicator. - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970

With diallyl phthalate, this method of test should be carried out cautiously and only small amounts should be ignited at one time because of the risk of explosive polymerization. The principle consists in burning of a test portion and heating in an electric furnace at (600 30) °C to constant mass. - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970.

The method is applicable to simple and mixed alcohol esters that are liquid at ambient temperature. The principle of analysis consists in burning a test portion in a platinum or silica dish and ignition in a muffle furnace controlled at (600 30) 0C. Weighing of the residue.

The method is applicable to simple and mixed alcohol esters that are liquid at ambient temperature. The following principle is specified: Saponification of the ester using potassium hydroxide in ethanolic solution followed by titration with standard volumetric hydrochloric acid solution in the presence of phenolphthalein as indicator. In the case of mixed alcohol esters the relative molar mass of which can only be estimated the saponification and ester values are used to express the result.

The method specified is applicable to simple and mixed alcohol esters that are liquid at ambient temperature. The heat treatment is carried out in a tube of borosilicate glass in an oil bath at a temperature of (180 2) 0C for 2 h. Measurement of the colour of the heat-treated sample by the method specified in ISO 2211.

Specifies the sampling, the determination of the density at 20 0C, of the water content, of the acidity to phenolphthalein, of the ash and esther contents, the measurement of colour in Hazen units and of the colour after the heat treatment.

Specifies the sampling, the determination of the density at 20 0C, of the water content, of the acidity to phenol red, of apparent free phenols content and the measurement of colour in Hazen units.

The method specified determines only those phenols capable of reacting at the 2nd, 4th and 6th position (-OH = 1). The procedure consists in extraction of free phenols from a test portion with sodium hydroxide solution. Bromination of these phenols with potassium bromide-bromate solution in an acid medium and determination of the excess bromine after reaction with potassium iodide by titration with standard volumetric sodium thiosulphate solution.

Specifies the titration of any acidity present in an ethanolic solution with standard volumetric sodium hydoxide solution in the presence of phenol red as indicator. The end point of the titration corresponds to the formation of the salt Na2 HPO4 .