ISO-685-1975.pdf
《ISO-685-1975.pdf》由会员分享,可在线阅读,更多相关《ISO-685-1975.pdf(5页珍藏版)》请在三一文库上搜索。
1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION +WK!WHAPOnHAR OPrAHM3AUMII II0 CTAHLIAPT3AUHHORGANlSATlON INTERNATIONALE DE NORMALISATION Analysis of soaps - Determination of total alkali content and total fatty matter content Analyse des savons - De termination des teneurs en
2、alcali total et en matihe grasse totale First edition - 1975-10-15 lJ 6: I 2 ” Descriptors : surfactants, soaps, chemical analysis, determination of content, alkalies, volumetric analysis. ii3 E Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under lic
3、ense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 08:02:38 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
4、 Member Bodies). The work of developing International 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
5、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 685 is the result of
6、 the combination of draft International Standards ISO/DIS 455 and ISO/DIS 685 drawn up by Technical Committee ISO/TC 91, Surface active agents. Drafts ISO/DIS 455 and ISO/DIS 685 were circulated to the Member Bodies in November 1973 and December 1973 respectively. ISO/DIS 455 has been approved by th
7、e Member Bodies of the following countries : Australia Austria Belgium Bulgaria Chile Egypt, Arab Rep. of France Germany Hungary India Iran Ireland Japan Korea, Rep. of Netherlands New Zealand Poland South Africa, Rep. of Spain Switzerland Thailand Turkey United Kingdom U.S.A. U.S.S.R. Yugoslavia No
8、 Member Body expressed disapproval of the document. ISO/DIS 685 has been approved by the Member Bodies of the following countries : Australia Austria Belgium Bulgaria Canada Chile Egypt, Arab Rep. of France Germany Hungary India Iran Ireland Japan Korea, Rep. of Netherlands New Zealand Romania South
9、 Africa, Rep. of Spain Switzerland Thailand Turkey United Kingdom U.S.A. Yugoslavia No Member Body expressed disapproval of the document. This International Standard cancels and replaces IS0 Recommendations R 455-1965 and R 685-1968, of which it constitutes a technical revision. 0 International Orga
10、nization for Standardization, 1975 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 08:02:38 MDTNo reproduction or networking permitted without license fr
11、om IHS -,-,- INTERNATIONAL STANDARD IS0 685-1975 (E) Analysis of soaps - Determination of total alkali content and total fatty matter content 1 SCOPE AND FIELD OF APPLICATION This international Standard specifies a method for the simultaneous determination of the total alkalil) content and the total
12、 fatty matter content of soaps, excluding compounded products. This method for the determination of total alkali is not applicable to coloured soaps if the colour interferes with the methyl orange end-point. 2 REFERENCES IS0 684, Analysis of soaps - Determination of total free alkali. ISO. ., Soaps
13、- Sampling.2) 3 DEFINITIONS For the purposes of this International Standard, the following definitions apply : total alkali : The sum of the alkali bases combined as soap with fatty and rosin acids, as well as those corresponding to free alkali metal hydroxides or carbonates and to any silicates pre
14、sent which will be titrated under the test conditions. The results are expressed as a percentage by mass of either sodium hydroxide (NaOH) or of potassium hydroxide (KOH), according to whether sodium or potassium soaps are concerned. total fatty matter: The water-insoluble fatty material obtained by
15、 decomposing the soap with a mineral acid under the conditions specified. This term includes unsaponifiable matter, glycerides and any rosin acids contained in the soap, in addition to the fatty acids. 4 PRINCIPLE Decomposition of the soap by a known volume of standard volumetric mineral acid soluti
16、on, extraction and separation of the liberated fatty matter with light petroleum and determination of the total alkali content by titration of the excess of acid contained in the aqueous phase with a standard volumetric sodium hydroxide solution. After evaporation of the light petroleum from the ext
17、ract, dissolution of the residue in ethanol and neutralization of the fatty acids with a standard volumetric potassium hydroxide solution. Evaporation of the ethanol and weighing of the soap formed to determine the total fatty matter content. 5 REAGENTS During the analysis, use only reagents of reco
18、gnized analytical reagent grade and only distilled water or water of equivalent purity. 5.1 Acetone. 5.2 Light petroleum, boiling range between 46 and 60 “C. 5.3 Ethanol, 95 % (V/V) solution, neutralized to the phenolphthalein solution (5.8). 5.4 Sulphuric acid or hydrochloric acid, approximately 1
19、N standard volumetric solution 5.5 Sodium hydroxide, approximately 1 N standard volumetric solution, standardized using the methyl orange solution (5.7) as indicator. 5.6 Potassium hydroxide, approximately 1 N standard volumetric solution in ethanol (5.3). 5.7 Methyl orange, 2 g/l solution. 5.8 Phen
20、olphthalein, 10 g/l solution in ethanol (5.3). . ,. 6 APPARATUS Ordinary laboratory apparatus and 6.1 Beaker, capacity 250 ml, squat form, complying with IS0 3819. 1) See also IS0 684. 2) In preparation. 1 Copyright International Organization for Standardization Provided by IHS under license with IS
21、O Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 08:02:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 685-1975 (E) 6.2 6.3 and 6.4 6.5 Separating funnels, capacity 500 ml, or Extraction cylinder, capacity 250 ml, diameter 39 mm height 355
22、mm, fitted with a ground glass stopper. Water bath. Oven, capable of being controlled at 103 + 2 “C. 7 SAMPLING The laboratory sample of soap shall be prepared and stored in accordance with the instructions given in IS0 . 8 PROCEDURE Carry out two determinations on the same sample. 8.1 Test portion
23、Weigh, to the nearest 0,001 g, about 5 g of the laboratory sample into the beaker (6.1). 8.2 Determination Dissolve the test portion (8.1) in about 100 ml of hot water. Pour the solution into one of the separating funnels (6.2) or into the extraction cylinder (6.3) and wash the beaker with small qua
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 685 1975
链接地址:https://www.31doc.com/p-3779217.html