BS EN 12139-1999 Surface active agents - Determination of the total polyethylene glycol content of non-ionic surface active agents (EO adducts) by HPLC GPC《表面活性剂 用HPLC GPC法测定非离子表面活.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12139:1999 The Euro

2、pean Standard EN 12139:1999 has the status of a British Standard ICS 71.100.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Surface active agents Determination of the total polyethylene glycol content of non-ionic surface active agents (EO adducts) by HPLC/GPCThis British S

3、tandard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 BSI 06-1999 ISBN 0 580 32268 8 BS EN 12139:1999 Amendments issued since publication Amd. No. Date

4、Comments National foreword This British Standard is the English language version of EN 12139:1999. The UK participation in its preparation was entrusted to Technical Committee CII/34, Methods of test for surface active agents, which has the responsibility to: aid enquirers to understand the text; pr

5、esent to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can

6、 be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the

7、“Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from l

8、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat

9、: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12139:1999 E EUROPEAN STANDARD EN 12139 NORME EUROPE ENNE EUROPA ISCHE NORM February 1999 ICS 71.100.40 Descriptors: surfactants, non-ionic

10、surfactants, chemical analysis, determination of content, polyethylene, glycol, condensates, chromatography, high performance liquid chromatography English version Surface active agents Determination of the total polyethylene glycol content of non-ionic surface active agents (EO adducts) by HPLC/GPC

11、 Agents de surface De termination de la teneur totale en polye thyle ne glycol des agents de surface non ioniques (condensats OE) par CLHP/CPG Grenzfla chenaktive Stoffe Bestimmung des Gesamtgehaltes an Polyethylenglycol von nichtionischen grenzfla chenaktiven Stoffen (EO-Addukten) mit HPLC/GPC This

12、 European Standard was approved by CEN on 25 January 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referen

13、ces concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into

14、 its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Sp

15、ain, Sweden, Switzerland and United Kingdom.Page 2 EN 12139:1999 BSI 06-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 276, Surface active agents, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard,

16、 either by publication of an identical text or by endorsement, at the latest by August 1999, and conflicting national standards shall be withdrawn at the latest by August 1999. Annexes A, B, C and D are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizati

17、ons of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Page 3 EN 12139:1999 BSI 06

18、-1999 1) CAS Registry Number 99561-04-3. 1 Scope This European Standard specifies a method for the determination of the total polyethylene glycol (PEG) content of aromatic and aliphatic non-ionic surface active agents of the type R2(O2C 2 H 4 ) p 2OH, where p is the mean ethylene oxide (EO) value. I

19、t applies for concentrations of PEG higher than approximately 0,1 g/100 g of the laboratory sample. The method is applicable up to a degree of ethoxylation of at least 25 for products which are soluble in an 80/20 (V/V) mixture of methanol and water. Long-chain products with a low degree of ethoxyla

20、tion, such as tallow alcohol 1) 5 EO, are not soluble, and require an amended preliminary treatment. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the tex

21、t and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applie

22、s. EN ISO 3696, Water for analytical laboratory use Specification and test methods. (ISO 3696:1987) ISO 607:1980, Surface active agents and detergents Methods of sample division. ISO 6353-2:1983, Reagents for chemical analysis Part 2: Specifications First series. ISO 6353-3:1987, Reagents for chemic

23、al analysis Part 3: Specifications Second series. 3 Principle Polyethylene glycol is separated from its monoalkyl ethers by a reverse phase chromatography column. The use of an additional gel chromatography column (GPC) enables the determination of the molecular mass distribution of the polyethylene

24、 glycols in the surface active agent raw material by comparison with PEG calibration PEG standards. Small amounts of low carboxylic acids, which are often used in industrial processes to neutralize the ethoxylation catalyst, and which interfere with the determination, are removed together with long-

25、chain alkyl polyglycol ethers by means of a special cartridge method. This eliminates potential interference factors and decreases the analysis times. 4 Reagents and materials During the analysis, unless otherwise stated, use only reagents specified in ISO 6353-2:1983 and ISO 6353-3:1987 if listed t

26、here, if not, reagents of recognized analytical grade. 4.1 Methanol, HPLC grade. 4.2 Deionized water, filtered, conforming to the requirements of grade 1 in EN ISO 3696. 4.3 Polyethylene glycol 800, GPC grade. 4.4 Analytical grade anion exchange resin, 100 mesh to 200 mesh, chloride form, total capa

27、city 3,5 milliequivalents/g dry resin. 4.5 Reversed phase C18, silica gel, bulk material, particle diameter about 40mmt o6 0m m. 4.6 Sodium hydroxide solution, c(NaOH) = 1 mol/l. 4.7 Nitric acid, c(HNO 3 ) = 1 mol/l. 4.8 Silver nitrate solution, c(AgNO 3 ) = 1 mol/l. 4.9 Mobile phase, either a) 80/2

28、0 (V/V) mixture of methanol/water for samples of the type alkylphenol (e.g. i-nonyl phenol 7 EO) or fatty alcohols (e.g. C12/C14 7 EO) with a low degree of ethoxylation; or b) 75/25 (V/V) mixture of methanol/water for samples of the type of alkylphenol (e.g. i-octyl phenol 25 EO) or fatty alcohols (

29、e.g. C12/C14 25 EO) with a high degree of ethoxylation. 5 Apparatus Ordinary laboratory apparatus and the following. 5.1 Isocratic HPLC unit, with refractive index detector and column oven. 5.2 Data systems, with reintegration facilities for the chromatograms. 5.3 Sample preparation unit, for solid

30、phase extraction, such as a vacuum chamber. 5.4 Disposable syringes, 10 ml. 5.5 One-mark volumetric flasks, 10 ml and 50 ml. 5.6 One-mark pipette, 2 ml. 5.7 Piston-type graduated pipette, 10 ml. 5.8 Preparative glass chromatography column. 5.9 Special cartridge, prepared as follows. Convert the ion

31、exchanger (4.4) from chloride to hydroxide form by filling a chromatography column with it and washing it with sodium hydroxide solution (4.6) until no more chloride ions are detected. Wash the exchanger with water and remove from the column. NOTE The absence of chloride is confirmed when the eluant

32、 does not form a precipitate with nitric acid/silver nitrate solution.Page 4 EN 12139:1999 BSI 06-1999 Remove the plunger from a 10 ml disposable syringe (5.4), place some cotton wool in the barrel and press down firmly into the end of the barrel with a rod. Add the reversed phase C18 silica gel (4.

33、5) up to the 10 ml mark (4,0 g to 4,5 g). Place some cotton wool above the added reversed phase C18 silica gel, press down firmly with the rod, and set the cartridge on the sample preparation unit (5.3). Apply a vacuum and pour the exchanger suspension into the cartridge until about 1 cm is present

34、(see Figure B.1). Wash the cartridge by filling it three times with 5 ml methanol, then three times with the mobile phase to be used (4.9). Carry out this washing sequence shortly before the sample is added (see clause 6) to prevent the exchanger drying and cracking. 5.10 Chromatography columns Prep

35、are two chromatography columns as follows: a) one column, 250 mm long and 4 mm internal diameter, containing reversed phase C18 silica gel, 5mm; b) one GPC column for aqueous applications, 300 mm long and 7,8 mm internal diameter containing a stationary phase of pore size 1203 10 24 mm, exclusion li

36、mit (PEO) 53 10 3 g/mol. Convert the GPC column for methanol/water using a gradient from 0 % methanol to 80 % methanol over a period of 3 h. 6 Sampling and preparation of the test sample The laboratory sample shall be prepared and stored in accordance with 5.3 of ISO 607. Prepare a sample stock solu

37、tion by weighing 5 g of the laboratory sample to the nearest 0,1 mg, into a 50 ml volumetric flask (5.5) and making up to the mark with the mobile phase (4.9). Place the solution in an ultrasonic bath until it has dissolved completely. Prepare a test sample by placing a 10 ml volumetric flask in the

38、 sample preparation unit (5.3) so that the cannula of the special cartridge (5.9) ends in the neck of the flask. Using one marked pipette, add 2 ml of the sample stock solution to the special cartridge (5.9). When the sample stock solution has been adsorbed in the cartridge, rinse twice with 4 ml mo

39、bile phase (4.9). NOTE These solvent quantities should be used to ensure efficiency of the cartridge. Remove the 10 ml volumetric flask from the sample preparation unit and allow it to return to room temperature. Fill to the mark with the mobile phase to be used and transfer it to the automatic samp

40、ling vessels or use for direct injection. 7 Procedure 7.1 Apparatus settings Connect the chromatography columns in series first: C18 silica gel column (5.10a); second: GPC column (5.10b). Set the HPLC unit to the following: Detector: RI. Flow rate: 1,0 ml/min. Temperature: Column 308C. Injection vol

41、ume: 100ml. 7.2 Calibration 7.2.1 Preparation of calibration solutions Prepare five calibration solutions using the standard of polyethylene glycol 800 (PEG 800) (4.3) as follows. Weigh, to the nearest 0,1 mg, five levels of PEG 800 between 15 mg to 80 mg of the PEG (e.g. 15 mg, 25 mg, 40 mg, 60 mg

42、and 80 mg) into separate 50 ml volumetric flasks and fill to the mark with the mobile phase to be used (4.9). Ensure that the solutions are properly dissolved. 7.2.2 Calibration curve Analyse each calibration solution, prepared in 7.2.1,a t least twice using the chromatographic conditions given in 7

43、.1. Construct a graph of peak area against PEG mass in calibration solutions and draw a calibration curve. 7.3 Determination of polyethylene glycol content Carry out at least two analyses on the test sample solution as prepared in clause 6, using the chromatographic conditions given in 7.1. NOTE Eva

44、luation of the chromatograms is carried out automatically with the help of the available data system by means of the external standard method. Under some circumstances reintegration can be necessary. Analysis times are considerably longer if the sample preparation is not carried out as described in

45、clause 6. Examples of chromatograms are given in annex C. 8 Expression of results Use the calibration curve 7.2.2 to obtain the PEG mass corresponding to the area given by the integrator. Express the PEG content in percentage by mass as follows: % PEG = m3 100 m 0 where m 0 is the mass of sample to

46、be analysed (see clause 6) in grams; m is the mass of PEG in the sample determined from the calibration curve (see 7.2.1)i n grams.Page 5 EN 12139:1999 BSI 06-1999 9 Precision 9.1 Repeatability The repeatability conditions are conditions where mutually independent test results are obtained with the

47、same method on identical test material in the same laboratory by the same operator using the same equipment within short intervals of time. The absolute difference between two single test results obtained under repeatability conditions shall not be greater than: 0,12 g/100 g laboratory sample at a l

48、evel of 0,67 % PEG (see annex A, sample 1); 0,27 g/100 g laboratory sample at a level of 1,19 % PEG (see annex A, sample 2). NOTE In order to take into account the value of the repeatability standard deviation determined from the ring test for low quantities (in sample 1), the result should be calcu

49、lated as the mean of five determinations to two decimal digits. 9.2 Reproducibility The reproducibility conditions are conditions where test results are obtained with the same method on identical test material in different laboratories with different operators using different equipment. The absolute difference between two single test results obtained under reproducibility conditions shall not be greater than: 0,66 g/100 g laboratory sample at a level of 0,67 % PEG (see annex A, sample 1); 0,45 g/100 g laboratory sample at a le