1388/11 International Standard (tso) Ethanol for industrial use - Methods of test - Part 11 :Test for detection of furfural Ethanol a usage industriel - Methodes d'essai - Partie 11: Essai de detection du furfural First edition -- 1981-12-01 UDC 661.722 : 543.8 : 547.724.1 Ref.No.ISO 1388/11-1981 (E) Descriptors : industrial products, ethanols, tests, furfurals. Price based on 2 pages Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee 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 before their acceptance as International Standards by the iso Council. International StandardISo1388/11wasdevelopedbyTechnical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in February 1980. Australia Germany, F.R. Romania Austria Hungary South Africa, Rep. of Belgium India Switzerland Brazil Italy Thailand Bulgaria Korea, Rep. of United Kingdom China Netherlands USSR Czechoslovakia Philippines France Poland No member body expressed disapproval of the document. This International Standard has also been approved by the international Union of Pure and Applied Chemistry (IUPAC). International Standards ISo 1388/1 to ISO 1388/12 cancel and replace ISO Recom- mendation R 1388-1970, of which they constitute a technical revision. ? International Organization for Standardization, 1981 Printed in Switzerland ISO1388/11-1981(E) INTERNATIONALSTANDARD Ethanol for industrial use - Methods of test Part 11 : Test for detection of furfural Scope and field of application 4 Apparatus This part of iSo 1388 specifies a test for checking whether or Ordinary laboratory apparatus. not furfural is present in ethanol for industrial use. This document should be read in conjunction withISo1388/1 5Procedure (see the annex). 5.1 Test portion 2Principle Take 10 ml of the laboratory sample or a different volume agreed between the interested parties. Treatment of a test portion with aniline and acetic acid, the presence of furfural leading to the formation of a characteristic red colour. 5.2Test Placethe test portion(5.1)in atest tube,add 0,5 ml of the 3Reagents aniline (3.1) and 1 ml of the acetic acid (3.2). Mix and observe whether or not a red colour develops immediately or within During the test, use only reagents of recognized analytical 3 min of carrying out the test. grade. Expression of results 3.1 Aniline (CsHgNH2), distilled immediately before use. Depending on whether or not a red colour is formed in the test 3.2 Glacial acetic acid, 1,05 g/ml. (5.2), report, respectively, the presence or absence of furfural. 1