1、BRITISH STANDARDBS EN ISO 3071:2006Textiles Determination of pH of aqueous extract The European Standard EN ISO 3071:2006 has the status of a British StandardICS 59.080.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g
2、40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 3071:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2006 BSI ISBN 0 580 47998 6National forewordThis British Standard is the official English langu
3、age version of EN ISO 3071:2006. It is identical with ISO 3071:2005. It supersedes BS EN 1413:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee TCI/80, Textiles Chemical testing, which has the responsibility to: A list of organizations represented o
4、n this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by us
5、ing the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity f
6、rom legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK
7、.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 4, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the
8、document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 3071March 2006ICS 59.080.01 Supersedes EN 1413:1998 English VersionTextiles Determination of pH of aqueous extract (ISO 3071:2005)Textiles Dtermination du pH de lex
9、trait aqueux (ISO 3071:2005)Textilien Bestimmung des pH des wssrigen Extraktes(ISO 3071:2005)This European Standard was approved by CEN on 3 February 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the sta
10、tus of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 ve
11、rsion in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estoni
12、a, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES
13、 KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 3071:2006: EForeword The text of ISO 3071:2005 has been prepared by Technical Committee ISO/TC 38 “Tex
14、tiles” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 3071:2006 by Technical Committee CEN/TC 248 “Textiles and textile products“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either b
15、y publication of an identical text or by endorsement, at the latest by September 2006, and conflicting national standards shall be withdrawn at the latest by September 2006. This document supersedes EN 1413:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations
16、 of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, S
17、lovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 3071:2005 has been approved by CEN as EN ISO 3071:2006 without any modifications. EN ISO 3071:2006Reference numberISO 3071:2005(E)INTERNATIONAL STANDARD ISO3071Third edition2005-06-15Textiles Determination of
18、pH of aqueous extract Textiles Dtermination du pH de lextrait aqueux EN ISO 3071:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Principle. 1 5 Reagents 1 6 Apparatus 2 7 Preparation of test samples. 2 8 Procedure 2 8.1 Preparati
19、on of the aqueous extract 2 8.2 Measurement of the pH of the aqueous extract 2 9 Calculation. 3 10 Precision 3 11 Test report . 3 Annex A (informative) Preparation of standard buffer solutions 4 EN ISO 3071:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide feder
20、ation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that commit
21、tee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordanc
22、e with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires a
23、pproval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3071 was prepared by Technical Comm
24、ittee ISO/TC 38, Textiles. This third edition cancels and replaces the second edition (ISO 3071:1980), which has been technically revised. EN ISO 3071:2006vIntroduction The pH-value of the aqueous extract of a textile affords a useful index to its processing history. In addition, it is becoming more
25、 common to demand that the textile, in its various forms, conforms to certain limits in respect of its acidity or alkalinity, often expressed in terms of the pH-value of the aqueous extract. EN ISO 3071:2006blank1Textiles Determination of pH of aqueous extract 1 Scope This International Standard spe
26、cifies a method for determining the pH of the aqueous extract of textiles. The method is applicable to textiles in any form. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For und
27、ated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 pH co-logarit
28、hm of the hydrogen ion concentration in an aqueous extract 4 Principle The pH-value of an aqueous extract of a textile is measured electrometrically at room temperature by means of a glass electrode. 5 Reagents All reagents used shall be of recognized analytical grade. 5.1 Distilled or deionized wat
29、er, of at least grade 3 as defined in ISO 3696, having a pH between 5,0 and 7,5. The pH shall be verified the first time the water is used. If it is not within the specified range, the water shall be redistilled using chemically resistant glassware. Acid or organic matter can be removed by distillin
30、g water from a solution of 1 g/l potassium permanganate and 4 g/l sodium hydroxide. Alkalinity (e.g. the presence of ammonia) can be removed by distilling the water from a solution of dilute sulfuric acid. If the distilled water is not grade 3, boil 100 ml of distilled water in a beaker at a moderat
31、e rate for (10 r 1) min and allow the covered beaker to cool to room temperature. 5.2 Potassium chloride solution, 0,1 mol/l, prepared using distilled or deionized water (5.1). 5.3 Buffer solutions, which may be prepared as specified in Annex A, having a pH similar to that being determined, for cali
32、bration of the pH-meter before measurement. Buffer solutions having a pH around 4, 7 or 9 are recommended. EN ISO 3071:20062 ISO 2005 All rights reserved6 Apparatus 6.1 Stoppered glass or polypropylene flasks, chemically resistant, for preparation of the aqueous extract. NOTE It is recommended that
33、the glassware used for this test be set aside for this purpose only and filled with distilled water between tests. 6.2 Mechanical shaker, providing rotational or reciprocating movement sufficient to obtain a ready exchange of liquid between the interior of the textile material and the solution used
34、in preparing the extract. A to-and-fro movement at a rate of 60 min1or a rotational frequency of 30 min1has been found satisfactory. 6.3 Beakers, chemically resistant, with a capacity of 150 ml (see Note to 6.1). 6.4 Rods, chemically resistant (see Note to 6.1). 6.5 pH-meter, with a glass electrode,
35、 capable of measuring to at least 0,1 pH-units. 6.6 Balance, accurate to 0,01 g. 6.7 1 l volumetric flasks, of grade A quality. 7 Preparation of test samples 7.1 Take a laboratory sample representative of the bulk of the textile material and sufficient to provide all the test samples required. Cut t
36、he laboratory sample into pieces having approximately 5 mm sides or of such a size as to allow the test samples to wet out rapidly. 7.2 To avoid contamination, handle the material as little as possible. Take from the laboratory sample three test samples of (2,00 r 0,05) g each. 8 Procedure 8.1 Prepa
37、ration of the aqueous extract Prepare the extract in triplicate at room temperature, as follows: Place each test sample and 100 ml of extracting solution either water (5.1) or potassium chloride solution (5.2) into a stoppered flask (6.1). Agitate the flask for a short period by hand to ensure that
38、the textile material is properly wetted out, then shake it mechanically for 2 h r 5 min. Record the temperature of the extracting solution used. 8.2 Measurement of the pH of the aqueous extract Calibrate the pH-meter at the temperature of the extract to be measured. Check the calibration of the pH-m
39、eter using two buffer solutions. Immerse the electrode several times in the same solution (water or KCl solution) used to prepare the extract until the indicated pH-value stabilizes. Decant the first extract into a beaker, immediately immerse the electrode to a depth of at least 10 mm and stir gentl
40、y with a rod until the pH-value stabilizes (do not record the pH-value of this solution). Decant the second extract into another beaker, immediately immerse the electrode, without washing, in the beaker to a depth of at least 10 mm and allow to stand without stirring until the pH-value stabilizes. R
41、ecord this value. EN ISO 3071:20063Decant the third extract into another beaker, immediately immerse the electrode, without washing, in the beaker to a depth of at least 10 mm and allow to stand without stirring until the pH-value stabilizes. Record this value. Record the pH-values of the second and
42、 third extracts as the first and second measurements. 9 Calculation If the difference between the two pH-values, expressed to the nearest 0,1 pH-units, is greater than 0,2, repeat the procedure with other test samples. When two valid measurements have been obtained, calculate the mean value. 10 Prec
43、ision Interlaboratory trials were carried out between nine laboratories measuring seven samples. Statistical analysis was carried out and the following results were obtained: Using water (5.1) as the extracting solution: Reproducibility limit R 1,7 pH-units; Using KCl solution (5.2) as the extractin
44、g solution: Reproducibility limit R 1,1 pH-units. NOTE The statistical analysis was carried out in accordance with ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measuremen
45、t method. 11 Test report The test report shall include the following information: a) a reference to this International Standard, i.e. ISO 3071; b) the mean pH-value, to the nearest 0,1 pH-units; c) the type of solution used (water or KCl solution); d) the pH of the extracting solution; e) the temper
46、ature of the extracting solution; f) any factor likely to have had an effect on the results, including any resistance to wetting out of the test samples g) the date of the determination. EN ISO 3071:20064 Annex A (informative) Preparation of standard buffer solutions A.1 General Use only reagents of
47、 recognized analytical reagent grade. Prepare the buffer solutions using water of at least grade 3 as defined in ISO 3696 and renew them at least once a month. A.2 pH 4,0 potassium hydrogen phthalate solution (0,05 mol/l) Dissolve 10,21 g of potassium hydrogen phthalate (KHC8H4O4) in distilled or de
48、ionized water in a 1 l volumetric flask and dilute to the mark. The pH of this solution is 4,00 at 20 C and 4,01 at 25 C. A.3 pH 6,9 potassium dihydrogen orthophosphate and disodium hydrogen orthophosphate solution (0,08 mol/l) Dissolve 3,9 g of potassium dihydrogen orthophosphate (KH2PO4) and 3,54
49、g of disodium hydrogen orthophosphate (Na2HPO4) in distilled or deionized water in a 1 l volumetric flask and dilute to the mark. The pH of this solution is 6,87 at 20 C and 6,86 at 25 C. A.4 pH 9,2 disodium tetraborate solution (0,01 mol/l) Dissolve 3,80 g of disodium tetraborate decahydrate (Na2B40710H2O) in distilled or deionized water in a 1 l volumetric flask and dilute to the mark. The pH of this solution is 9,23 at 20 C and 9,18 at 25 C. EN ISO 3071:2006blankBS EN ISO 3071:2006BSI389 Chiswick High RoadLondonW4 4ALBSI Bri
