1、 DEUTSCHE NORM May 2006DIN EN ISO 3071 ICS 59.080.01 Supersedes DIN EN 1413:1998-05 Textiles Determination of pH of aqueous extract (ISO 3071:2005) English version of DIN EN ISO 3071:2006-05 Textilien Bestimmung des pH des wssrigen Extraktes (ISO 3071:2005) Englische Fassung DIN EN ISO 3071:2006-05
2、Document comprises 10 pages No part of this standard may be reproduced without prior permission of DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). English price group 7 www.din.de www.beuth.
3、de !,nlu“11.06 9757382DIN EN ISO 3071:2006-05 2 National foreword This standard has been published in accordance with a decision taken by CEN/TC 248 to adopt, without alteration, International Standard ISO 3071 as a European Standard. The responsible German body involved in its preparation was the N
4、ormenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NMP 512 Textilchemische Prfverfahren und Fasertrennung. The DIN Standard corresponding to the International Standard referred to in clause 2 of the EN is as follows: ISO 3696 DIN ISO 3696 Amendments This stand
5、ard differs from DIN EN 1413:1998-05 as follows: a) The number of the standard has been modified. b) Clause 10 became clause 11 and vice versa. Previous editions DIN 54276: 1966-03, 1989-08 DIN EN 1413: 1998-05 National Annex NA (informative) Bibliography DIN ISO 3696, Water for analytical laborator
6、y use Specification and test methods EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3071 March 2006 ICS 59.080.01 Supersedes EN 1413:1998 English Version Textiles - Determination of pH of aqueous extract (ISO 3071:2005) Textiles - Dtermination du pH de lextrait aqueux (ISO 3071:2005) Texti
7、lien - 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 European Standard the status of a national standard w
8、ithout any alteration. Up-to-date lists and bibliographical references 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 languag
9、e made by translation under the responsibility of a CEN member into 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ger
10、many, 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 STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG
11、 Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3071:2006: EEN ISO 3071:2006 (E) 2 Foreword The text of ISO 3071:2005 has been prepared by Technical Committee ISO/TC
12、38 “Textiles” 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, e
13、ither by 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 organi
14、zations 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, Slov
15、akia, Slovenia, 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 3071:2006 (E) 3 Contents Page Foreword .2 Introduction.4 1 Scope5 2 Normative references5 3 Terms and definitions
16、 .5 4 Principle .5 5 Reagents 5 6 Apparatus.6 7 Preparation of test samples .6 8 Procedure.6 9 Calculation .7 10 Precision 7 11 Test report7 Annex A (informative) Preparation of standard buffer solutions.8 EN ISO 3071:2006 (E) 4 Introduction The pH-value of the aqueous extract of a textile affords a
17、 useful index to its processing history. In addition, it is becoming more 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 3071:2006 (E) 5 1 Scope This
18、International Standard specifies 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 edit
19、ion cited applies. For undated 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 definition
20、s apply. 3.1 pH co-logarithm 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
21、Distilled or deionized water, 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 c
22、an be removed by distilling 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 wate
23、r in a beaker at a moderate rate for (10 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 be
24、ing determined, for calibration of the pH-meter before measurement. Buffer solutions having a pH around 4, 7 or 9 are recommended. EN ISO 3071:2006 (E) 6 6 Apparatus 6.1 Stoppered glass or polypropylene flasks, chemically resistant, for preparation of the aqueous extract. NOTE It is recommended that
25、 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
26、 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
27、, 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
28、the 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 0,05) g each. 8 Procedure 8.1 Prepar
29、ation 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 t
30、he textile material is properly wetted out, then shake it mechanically for 2 h 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-mete
31、r 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 gently w
32、ith 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. Reco
33、rd this value. EN ISO 3071:2006 (E) 7 Decant 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
34、and 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 P
35、recision 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 extr
36、acting 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 mea
37、surement 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
38、 temperature 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 3071:2006 (E) 8 Annex A (informative) Preparation of standard buffer solutions A.1 General Use only
39、 reagents of 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 dis
40、tilled or deionized 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 (KH2PO
41、4) and 3,54 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.
