ISO-1388-9-1981.pdf
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1、International Standard 138819 INTERNATIONAL ORGANIZATION FOR STANOARDIZATlON*MEYHAPOfiHAR OPrAHMBAL(MR no CTAHAPTH3ALWWORGANlSATlON INTERNATIONALE DE NORMALSATION s il., *(“j. B i,. ., 1 “. j :, ; ,y ,; / .s ; a .,. I i t .;,i i . a 1% , J.i .-,. * Ethanol for industrial use - Methods of test - Part
2、 9 : Determination of esters content - Titrimetric method after saponification Ethanol B usage industriel - Mp:.i / : ;pc;i ;_, ,/,; ,.,. , I., , UDC 661.722 : 643.851.1 Ref. No. IS0 X388/9-1981 (E) Descriptors : industrial products, ethanols, tests, determination of content, esters, titration, sapo
3、nification. Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:36:14 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0
4、 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical comm
5、ittee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval
6、 before their acceptance as International Standards by the IS0 Council. International Standard IS0 13W9 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in February 1990. It has been approved by the member bodies of the following countries : Australi
7、a Germany, F.R. Austria Hungary Belgium India Brazil Italy Bulgaria Korea, Rep. of China Netherlands Czechoslovakia Philippines France Poland Romania South Africa, Rep. of Switzerland Thailand United Kingdom USSR No member body expressed disapproval of the document. This International Standard has a
8、lso been approved by the International Union of Pure and Applied Chemistry (IUPAC). International Standards IS0 13 determination of the residual sodium hydroxide, and hence the amount used for saponification, by titration with standard volumetric hydrochloric acid solution in the presence of phenolp
9、hthalein as indicator. 3 Reagents During the analysis, unless otherwise specified, use only reagents of recognized analytical grade, and distilled water or water of equivalent purity, carbon dioxide-free, recently prepared. 3.1 Water, carbon dioxide-free. Boil distilled water and allow it to cool in
10、 a flask fitted with a stopper carrying a soda-lime guard-tube. 3.2 Sodium hydroxide, standard volumetric solution, c(NaOH) = 0,l mol/l. 3.3 Hydrochloric acid, standard volumetric solution, c(HCI) = 0,l mol/l. 3.4 Phenolphthalein, 5 g/l ethanolic solution. Dissolve 0,5 g of phenolphthalein in 100 ml
11、 of 95 % (V/VI ethanol and add the sodium hydroxide solution (3.2) until a pale pink coloration is obtained. 4 Apparatus Ordinary laboratory apparatus, and 4.1 Conical flask, of borosilicate glass, of capacity 500 ml, and having a ground neck. 4.2 Reflux condenser, water-cooled having a ground glass
12、 joint to fit the flask (4.1). NOTE - Clean the apparatus as follows. Place a mixture of ethanol and sodium hydroxide solution (the propor- tions are not critical) in the flask (4.1). attach the reflux condenser (4.2) and heat the mixture gently under reflux for several minutes. Discard the mixture
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- ISO 1388 1981
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