ISO-1388-11-1981.pdf

International Standard ) 1388/l 1 0 a 4 4igi!b INTERNATIONAL ORGANIZATION FOR TANARDIZATION*MEXLIYHAPOAHAR oprAw3Aum nocTnn113nullGnNlsnTloN INTERNATIONALE DE &ORMALISATION Ethanol for industrial use - Methods of test - Part 11 : Test for detection of furfural Ethanol 2 usage industriel - M6thodes d essai - Partie II : Essai de dbtection du furfural First edition - 1981-12-01 UDC 661.722 : 543.8 : 647.724.1 Descriptors : industrial products, ethanols, tests, futfurals. Ref. No. IS0 KM/II-1981 (E) Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:32:05 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (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 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 IS0 Council. International Standard IS0 1388111 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in February 1980. It has been approved by the member bodies of the following countries : Australia 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 also been approved by the International Union of Pure and Applied Chemistry (IUPAC). International Standards IS0 138811 to IS0 1388/12 cancel and replace IS0 Recom- mendation R 1388-1970, of which they constitute a technical revision. 0 International Organization for Standardization, 1981 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:32:05 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 1388/11-1981 (E) Ethanol for industrial use - Methods of test - Part 11 : Test for detection of furfural 1 Scope and field of application This part of IS0 1388 specifies a test for checking whether or not furfural is present in ethanol for industrial use. This document should be read in conjunction with IS.0 138811 (see the annex). 2 Principle Treatment of a test portion with aniline and acetic acid, the presence of furfural leading to the formation of a characteristic red colour. 3 Reagents During the test, use only reagents of recognized analytical grade. 3.1 Aniline (CsHsNH,), distilled immediately before use. 3.2 Glacial acetic acid, Q I,05 g/ml. 4 Apparatus Ordinary laboratory apparatus. 5 Procedure 5.1 Test portion Take 10 ml of the laboratory sample or a different volume agreed between the interested parties. 5.2 Test Place the test portion (5.1) in a test tube, add 0,5 ml of the 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 3 min of carrying out the test. 6 Expression of results Depending on whether or not a red colour is formed in the test (5.21, report, respectively, the presence or absence of furfural. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:32:05 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1388/11-1981 (E) Annex IS0 Publications relating to ethanol for industrial use IS0 1389/l - General. IS0 1388/2 - Detection of alkalinity or determination of acidity to phenolphthalein. IS0 1388/3 - Estimation of content of carbonyl compounds present in small amounts - Photometric method. IS0 1388/4 - Estimation of content of carbonyl compounds present in moderate amounts - Titrimetric method. IS0 1388/5 - Determination of aldehydes content - Visual calorimetric method. IS0 1388/6 - Test for miscibility with water. IS0 1388/7 - Determination of methanol content methanol contents between 0,Ol and 0,20 % (V/VII - Photometric method. IS0 1388/8 - Determination of methanol content methanol contents between 0,lO and 1,50 % (V/v)1 - Visual calorimetric method. IS0 1388/g - Determination of esters content - Titrimetric method after saponification. IS0 1388/10 - Estimation of hydrocarbons content - Distillation method. IS0 1388/11 - Test for detection of furfural. IS0 1388/12 - Determination of permanganate time. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:32:05 MDTNo reproduction or networking permitted without license from IHS -,-,-