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1、International Standard 1388/8 INTERNATIONAL ORGANIZATION FOR STANOAROIZATIONW,4EYHAPOtiAfl OPTAHMSAL,b,R flOCTAHAPTkI3AMb4*ORGANlSATlON INTERNATIONALE DE hORMALISATION , I ( ” J : , ; $J “ . I :.,I , : i ,. - I Or,; .*. ,:,I ,i,.: i . Ethanol for industrial use - Methods of test - Part 8 : Determina
2、tion of methanol content methanol contents between 0,lO and I,50 % (I/l VII - Visual calorimetric method ethanol B usage industriel - Mbthodes d essai - Partie 8 : Dosage du mkthanol teneurs de 0,lO 4 I,50 % IV/ Vl/ - MI,.: ,” 3 ii UDC 661.722 : 643.432 : 547.261 Ref. No. IS0 1388/8-1981 (E) -. P i
3、Descriptors : industrial products, ethanols, tests, determination of content, carbinols, calorimetric analysis. s: 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/
4、28/2007 07:36:14 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
5、 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 Inter
6、national 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 1388/8 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member
7、 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 ltalv Bulgaria Korea, Rep. of China Netherlands Czechoslovakia Philippines France Poland Romania South Africa, Rep. of Switzerland Thailand Un
8、ited Kingdom USSR No member body expressed disapproval of the document. International Standards IS0 1388/l to IS0 1388112 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 Switzerlan
9、d 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 -,-,- INTERNATIONAL STANDARD IS0 X388/8-1981 (E) Et
10、hanol for industrial use - Methods of test - Part 8 : Determination of methanol content methanol contents between 0,lO and I,50 % (I/l VII - Visual calorimetric method 1 Scope and field of application This part of IS0 1388 specifies a visual calorimetric method for the determination of the methanol
11、content of ethanol for in- dustrial use. The method is applicable to products having methanol con- tents between 0,lO and I,50 % (VI VI. This document should be read in conjunction with IS0 1388/l (see the annex). 2 Principle Conversion of the methanol present in a test portion to for- maldehyde by
12、oxidation with a solution of potassium per- manganate in phosphoric acid. Reaction of the formaldehyde formed with Schiff reagent. Visual comparison of the colour obtained with the colours of standard calorimetric solutions containing known quantities of formaldehyde. 3 Reagents During the analysis,
13、 use only reagents of recognized analytical grade, and distilled water or water of equivalent purity. 3.1 Potassium permanganate, 30 g/l solution in phos- phoric acid. Dissolve 3 g of potassium permanganate in a little water, add 15,5 ml of orthophosphoric acid solution, Q I,69 g/ml, dilute to 100 m
14、l with water and mix. 3.2 Oxalic acid, 50 g/l solution in sulphuric acid. WARNING - Harmful in contact with skin and if swallowed. Avoid contact with skin and eyes. Dissolve 5 g of oxalic acid in 100 ml of 50 % (V/v) sulphuric acid solution, prepared by diluting sulphuric acid, Q approx- imately I,8
15、4 g/ml, about 98 % (m/m) solution, 1 + 1 (V/V) with water. 3.3 Schiff reagent, WARNING - Basic fuchsin is carcinogenic. Avoid skin contact with basic fuchsin and its solutions and inhala- tion of its dust. 3.3.1 Preparation Place 1 500 ml of water in a 3 000 ml conical flask, add 4,500 + 0,005 g of
16、p-rosaniline hydrochloride (basic fuchsin) and swirl to dissolve. Add 9,6 f 0,05 g of VI is the volume, in millilitres, of the test portion. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale
17、, 04/28/2007 07:36:14 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1388/8-1981 (E) Annex IS0 Publications relating to ethanol for industrial use IS0 1388/l - General. IS0 1388/2 - Detection of alkalinity or determination of acidity to phenolphthalein. IS0 1388/3 - Es
18、timation of content of carbon 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 miscib
19、ility 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 I,50 % (V/ v)l - Visual calorimetric method. IS0 1388/g - Determination of esters
20、 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. 3 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 -,-,-