BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf

上传人:feelhesitate105 文档编号:587911 上传时间:2018-12-15 格式:PDF 页数:14 大小:241.20KB
下载 相关 举报
BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf_第1页
第1页 / 共14页
BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf_第2页
第2页 / 共14页
BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf_第3页
第3页 / 共14页
BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf_第4页
第4页 / 共14页
BS ISO 709-2001 Essential oils - Determination of ester value《香精油 酯化值的测定》.pdf_第5页
第5页 / 共14页
亲,该文档总共14页,到这儿已超出免费预览范围,如果喜欢就下载吧!
资源描述

1、BRITISH STANDARD BS ISO 709:2001 Incorporating Corrigendum No. 1 Essential oils Determination of ester value ICS 71.100.60 BS ISO 709:2001 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was published under t

2、he authority of the Standards Policy and Strategy Committee on 8 November 2001 BSI 16 February 2005 ISBN 0 580 38667 8 National foreword This British Standard reproduces verbatim ISO 709:2001 and implements it as the UK national standard. It supersedes DD ISO 709:1980 which is withdrawn. The UK part

3、icipation in its preparation was entrusted to Technical Committee AW/54, Essential Oils, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or Europea

4、n publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all

5、the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on

6、the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, an ISO title page, pages ii and iii, a blank page, pa

7、ges 1 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 15557 Corrigendum No. 1 9 February 2005 See national forewordReference number ISO 709:2001(E) I

8、NTERNATIONAL STANDARD ISO 709 Second edition 2001-09-01 Essential oils Determination of ester value Huiles essentielles Dtermination de lindice desterISO 709:2001(E) DPF dlcsiremia ihTs PDF file mya ctnoain emdeddeb tyfepcaes. In acccnadroe with Aebods licnesign lopic,y this file may be pirntde ro i

9、vwede tub slahl ton eb ideted lnuess teh tyfepacse which aer emdeddeb era licnesed to dna intslaled on teh computre freporming teh idetign. In wodlnidaogn this f,eli trapies accept tniereh teh sersnoptilibiy of ton nifrgnigni Asebod licsnegni ilopcy. ehT ISO tneClar Secteraairt accepts no lilibaity

10、ni this .aera Aebod is a tedarmakr fo Aebod Stsyems Icntaropro.de teDails fo the sfotwera pcudorts sude to crtaee tihs PFD file can be fdnuo in the Glarene Info leratiev to the fil;e the Pc-FDaertion arapmteres were tpoimizde for pirtning. Evyre cera sah neeb taken to enseru taht teh file is suitlba

11、e fro sue by ISO memreb idob.se In teh lnuikley etnev ttah a plborem leratign to it is f,dnuo lpsaee ifnrom teh tneClar Sceterairat at the sserdda givne lebwo. ISO 1002 All rhgits rsevre.de elnUss towrehise scepfidei, on trap of tihs cilbuptanoi mya eb cudorperde ro utzilide ni yna form ro yb yna sn

12、aem, eelctinorc ro mecinahcal, inclidugn tohpociypong dna micrfoilm, wittuoh repmissino in writing form eitreh ISO at teh erddass lebwo ro ISOs memreb ydob in the ctnuoyr of the rtseuqee.r ISO cirypothg fofice saCe tsopale 65 1121-HC aveneG 20 leT. + 41 22 947 10 11 xaF + 14 22 947 90 74 E-mail ciry

13、pothgiso.ch eWb www.iso.ch ii ISO 709:2001(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each

14、 member body interested in a subject for which a technical committee has been established 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. ISO collaborates closely with the Internationa

15、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for

16、voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifyi

17、ng any or all such patent rights. International Standard ISO 709 was prepared by Technical Committee ISO/TC 54, Essential oils. This second edition cancels and replaces the first edition (ISO 709:1980), which has been technically revised. Annex A of this International Standard is for information onl

18、y.ISO 709:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downl

19、oading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the

20、General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address g

21、iven below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs memb

22、er body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch ii INTERNATIONAL STANDARD ISO 709:2001(E) 1 Essential oils Determination of ester value 1 Scope This International Standa

23、rd specifies a method for the determination of the ester value of an essential oil. This method is not applicable to essential oils containing lactones or an appreciable proportion of aldehydes. 2 Normative references The following normative documents contain provisions which, through reference in t

24、his text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the m

25、ost recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 356, Essential oils Preparation of test samples ISO 385-

26、1, Laboratory glassware Burettes Part 1: General requirements ISO 1242, Essential oils Determination of acid value 3 Term and definition For the purposes of this International Standard, the following term and definition applies. 3.1 ester value EV number of milligrams of potassium hydroxide required

27、 to neutralize the acids liberated by the hydrolysis of esters present in 1 g of the essential oil 4P r i n c i p l e The esters present in the essential oil are hydrolysed by heating under specified conditions with an excess of a standard volumetric ethanolic potassium hydroxide solution. The exces

28、s alkali is determined by back titration with a standard solution of hydrochloric acid. 5 Reagents During the analysis, use only reagents of recognized analytical grade and distilled or demineralized water or water of equivalent purity. 5.1 Ethanol, 95 % (volume fraction) at 20 C, freshly neutralize

29、d with the potassium hydroxide solution (5.2), in the presence of the coloured indicator (5.4) used for the determination.ISO 709:2001(E) 2 5.2 Potassium hydroxide, standard volumetric ethanolic solution, c(KOH) = 0,5 mol/l at 20 C, freshly restandardized before each series of tests. 5.3 Hydrochlori

30、c acid, standard volumetric solution, c(HCI) = 0,5 mol/l at 20 C. It is important that the reagent be taken at the specified temperature of 20 C, particularly the ethanolic solution of potassium hydroxide, as the volume varies greatly with temperature. 5.4 Coloured indicator. Use phenolphthalein, 2

31、g/l solution in ethanol (5.1), or phenol red, 0,4 g/l solution in ethanol, 20 % (volume fraction), if the essential oil has components that contain phenol groups. NOTE This particular case will be specified in the specific standard for the essential oil concerned. 6 Apparatus Usual laboratory appara

32、tus and, in particular, the following. 6.1 Saponification flask, with ground glass neck, of alkali-resistant glass, of capacity 100 ml to 250 ml, to which can be fitted a ground glass air condenser at least 1 m in length with 1 cm to 1,5 cm internal diameter. If necessary, and particularly for the e

33、ssential oils with high light fractions and depending on the time placed in the boiling water bath, the glass tube may be replaced by a water-cooled reflux condenser. 6.2 Test tubes, of capacity 5 ml. 6.3 Burettes, of capacity 25 ml, graduated in 0,05 ml, complying with the requirements of ISO 385-1

34、, class B. 6.4 Boiling water bath. 6.5 Analytical balance, accurate to the nearest 0,001 g. 6.6 Potentiometer. 7 Sampling Sampling is not included in the method specified in this International Standard. A recommended sampling method i sg iv eninIS O21 2 1) . It is important that the laboratory recei

35、ve a representative sample, not damaged or modified during transport or storage before the arrival at the laboratory. 8 Preparation of test sample The test sample shall be prepared according to ISO 356. 1) ISO 212, Essential oils Sampling.ISO 709:2001(E) 3 9 Procedure 9.1 Test portion Weigh, to the

36、nearest 0,005 g, 2 g of the test sample. The test portion may be different from this, if so specified in the specific standard for the essential oil concerned. 9.2 Blank test Carry out a blank test, in parallel with the determination (9.3), under the same conditions and using the same reagents. (See

37、 9.3.3.) 9.3 Determination 9.3.1 Introduce the test portion (9.1) into the saponification flask (6.1). Add from the burette (6.3) 25 ml of the potassium hydroxide solution (5.2) (see note) and fragments of pumice stone or porcelain. NOTE If the test portion has been retained from the determination o

38、f the acid value, it will not be necessary to neutralize it before adding the potassium hydroxide. For oils with a high ester value, increase the volume of the potassium hydroxide solution (5.2) used so that (V 0 V 1 ) (see clause 10) is at least equal to 10 ml. For oils with a low ester value, incr

39、ease the mass of the test portion used. Attach the air condenser or water-cooled reflux condenser, and place the flask in the boiling water bath (6.4) for a time depending on the essential oil analysed. This time is mentioned in the specification for the oil to be tested. Allow to cool and remove th

40、e tube. Add 20 ml of water and 5 drops of the phenolphthalein solution, or of the phenol red solution (5.4) if the essential oil contains phenols or compounds with phenolic groups. 9.3.2 Titrate the excess potassium hydroxide with the hydrochloric acid (5.3). 9.3.3 This determination may be carried

41、out with the solution resulting from the determination of the acid value, which can be used as the blank test, by adding 5 ml of ethanol (5.1) in this blank test before the addition of the 25 ml of potassium hydroxide solution (this volume corresponds to the volume introduced during the determinatio

42、n of the acid value). 9.4 Potentiometry Potentiometry may be used for all the essential oils, but it is particularly recommended for highly coloured essential oils for which it is difficult to appreciate the endpoint of the coloured indicator (e.g. vetiver oil). In this case, the same reagents and a

43、pparatus shall be used. NOTE These special cases will be established in the specific standards for the essential oils concerned.ISO 709:2001(E) 4 10 Expression of results 10.1 Calculation 10.1.1 Ester value The ester value (EV) is given by the formula 01 28,05 EV AV VV m where V 0 is the volume, in

44、millilitres, of hydrochloric acid (5.3) used for the blank test (9.2); V 1 is the volume, in millilitres, of hydrochloric acid (5.3) used for the determination (9.3.2); m is the mass, in grams, of the test portion; AV is the acid value determined according to ISO 1242. The mass fraction of ester, w,

45、 as a percentage, with respect to a stated ester, is given by the formula r EV 561 M w where M r is the relative molecular mass of the ester used to express the results conventionally; EV is the ester value calculated as above. Express the ester value to two significant figures when it is less than

46、100, and to three significant figures when it is 100 or more. 10.1.2 Ester value determined after the acid value When the determination is carried out on the solution resulting from the determination of the acid value, the ester value (EV) is obtained by the formula 01 28,05 EV ( ) VV m where V 1 is

47、 the volume, in millilitres, of hydrochloric acid (5.3) used in the new determination.ISO 709:2001(E) 5 11 Test report The test report shall state: all information necessary for the complete identification of the sample; the sampling method used, if known; the test method used, with reference to thi

48、s International Standard; all operating details not specified in this International Standard, or regarded as optional, together with details of any incidents which may have influenced the test result(s); the test result(s) obtained.ISO 709:2001(E) 6 Annex A (informative) Precision A.1 General At the

49、 time of publication of this International Standard, precision values for this test method have not been established. Nevertheless, taking into account the data available at present, it was considered useful for the users of this International Standard to include some indications of the values obtained for repeatability and reproducibility, and it is expected to be able to specify definitive values in the next revision of this International Stan

展开阅读全文
相关资源
  • BS ISO IEC 29150-2011 Information technology Security techniques Signcryption《信息技术 安全技术 签密》.pdfBS ISO IEC 29150-2011 Information technology Security techniques Signcryption《信息技术 安全技术 签密》.pdf
  • BS ISO IEC 15408-1-2009 Information technology - Security techniques - Evaluation criteria for IT Security - Introduction and general model《信息技术 安全技术 IT安全评价准则 一.pdfBS ISO IEC 15408-1-2009 Information technology - Security techniques - Evaluation criteria for IT Security - Introduction and general model《信息技术 安全技术 IT安全评价准则 一.pdf
  • BS ISO 7295-1988+A1-2014 Tyre valves for aircraft Interchangeability dimensions《飞机轮胎汽门嘴 互换性尺寸》.pdfBS ISO 7295-1988+A1-2014 Tyre valves for aircraft Interchangeability dimensions《飞机轮胎汽门嘴 互换性尺寸》.pdf
  • BS ISO 15118-1-2013 Road vehicles Vehicle to grid communication interface General information and use-case definition《道路车辆 车辆到电力通讯接口 通用信息和使用案例定义》.pdfBS ISO 15118-1-2013 Road vehicles Vehicle to grid communication interface General information and use-case definition《道路车辆 车辆到电力通讯接口 通用信息和使用案例定义》.pdf
  • BS ISO 13765-2-2004 Refractory mortars - Determination of consistency using the reciprocating flow table method《耐熔灰浆 使用往复流动表法测定一致性》.pdfBS ISO 13765-2-2004 Refractory mortars - Determination of consistency using the reciprocating flow table method《耐熔灰浆 使用往复流动表法测定一致性》.pdf
  • BS ISO 10998-2008+A1-2014 Agricultural tractors Requirements for steering《农业拖拉机 操纵要求》.pdfBS ISO 10998-2008+A1-2014 Agricultural tractors Requirements for steering《农业拖拉机 操纵要求》.pdf
  • BS Z 9-1998 Space data and information transfer systems - Advanced orbiting systems - Networks and data links - Architectural specification《空间数据和信息传输系统 高级轨道系统 网络和数据链接 结构规范》.pdfBS Z 9-1998 Space data and information transfer systems - Advanced orbiting systems - Networks and data links - Architectural specification《空间数据和信息传输系统 高级轨道系统 网络和数据链接 结构规范》.pdf
  • BS Z 7-1998 Space data and information transfer systems - ASCII encoded English《空间数据和信息传输系统 ASCII 编码英语》.pdfBS Z 7-1998 Space data and information transfer systems - ASCII encoded English《空间数据和信息传输系统 ASCII 编码英语》.pdf
  • BS Z 5-1997 Space data and information transfer systems - Standard formatted data units - Control authority procedures《航天数据和信息发送系统 标准格式数据单元 控制授权程序》.pdfBS Z 5-1997 Space data and information transfer systems - Standard formatted data units - Control authority procedures《航天数据和信息发送系统 标准格式数据单元 控制授权程序》.pdf
  • BS Z 4-1997 Space data and information transfer systems - Standard formatted data units - Structure and construction rules《航天数据和信息传输系统 标准格式数据单元 结构和构造规则》.pdfBS Z 4-1997 Space data and information transfer systems - Standard formatted data units - Structure and construction rules《航天数据和信息传输系统 标准格式数据单元 结构和构造规则》.pdf
  • 猜你喜欢
    相关搜索

    当前位置:首页 > 标准规范 > 国际标准 > BS

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1