1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 14088:2012Leather Chemical tests Quantitative analysisof tanning agents by filtermethod (ISO 14088:2012)BS EN ISO 14088:2012 BRITISH STANDARDNational forewordThis Briti
2、sh Standard is the UK implementation of EN ISO14088:2012.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not
3、 purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 68763 1ICS 59.140.30Compliance with a British Standard cannot confer immunity fromlegal obliga
4、tions.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14088 February 2012 ICS 59.140.30 English Version Leather - Ch
5、emical tests - Quantitative analysis of tanning agents by filter method (ISO 14088:2012) Cuir - Essais chimiques - Analyse quantitative des agents de tannage par la mthode au filtre cloche (ISO 14088:2012) Leder - Chemische Prfung - Quantitative Analyse von Gerbstoffen durch Filterverfahren (ISO 140
6、88:2012) This European Standard was approved by CEN on 31 January 2012. 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 bibliograp
7、hical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 responsibili
8、ty of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, H
9、ungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Manag
10、ement Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14088:2012: EBS EN ISO 14088:2012EN ISO 14088:2012 (E) 3 Foreword This document (EN ISO 14088:2012) has been prepared by Techn
11、ical Committee CEN/TC 289 “Leather”, the secretariat of which is held by UNI, in collaboration with Technical Committee IULTCS “International Union of Leather Technologists and Chemists Societies”. This European Standard shall be given the status of a national standard, either by publication of an i
12、dentical text or by endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be hel
13、d responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia
14、, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) ISO 2
15、012 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Principle . 1 4 Reagents 1 5 Apparatus . 1 6 Sampling and sample preparation . 3 7 Instrumental analysis 4 7.1 Preparation of the analytical solution . 4 7.1.1 Vegetable tanning agents in powder/solid form 4 7.
16、1.2 Vegetable tanning agents in liquid form . 4 7.1.3 Synthetic tanning agents in powder form . 4 7.1.4 Synthetic tanning agents in liquid form 4 7.1.5 Vegetable tanning agents organic solvent extracted in powder form . 4 7.2 Preparation of the bell . 5 7.3 De-tanning the analytical solution (determ
17、ination of the non-tanning agents) 5 7.4 Determination of soluble substances . 5 7.5 Determination of total solids 6 8 Calculation and expression of the results 6 9 Test report 7 Annex A (informative) Approximate quantity of vegetable tannic extract agent in powder/solid form to be weighed 8 Annex B
18、 (normative) Determination of hide powder blank value 9 Annex C (informative) Suppliers of hide powder . 10 BS EN ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) iv ISO 2012 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of nation
19、al 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 committee. Internatio
20、nal 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 accordance with the rule
21、s 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 approval by at l
22、east 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 14088 was prepared by the Chemical Test Commission
23、 of the International Union of Leather Technologists and Chemists Societies (IUC Commission, IULTCS) in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is held by UNI, in accordance with the Agreement on technical
24、cooperation between ISO and CEN (Vienna Agreement). IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, which are responsible for establishing international metho
25、ds for the sampling and testing of leather. ISO recognizes IULTCS as an international standardizing body for the preparation of test methods for leather. BS EN ISO 14088:2012INTERNATIONAL STANDARD ISO 14088:2012(E)IULTCS/IUC 32:2012(E) ISO 2012 All rights reserved 1Leather Chemical tests Quantitativ
26、e analysis of tanning agents by filter method 1 Scope This International Standard specifies a test method for the determination of tanning agents through filtration of all vegetable and synthetic tanning products. 2 Normative references The following referenced documents are indispensable for the ap
27、plication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use Specification and test methods 3 Principle Indirect gravimetric an
28、alysis of vegetable and synthetic tanning agents through fixing of the absorbent compounds on low-chromed hide powder. 4 Reagents 4.1 Distilled water, freshly prepared according to ISO 3696 (Water for analytical laboratory use, Grade 3). The pH value of the water shall be between 5 and 6. When using
29、 methyl red, the water should not turn red. The evaporation residue of 100 ml should be less than 1 mg. 4.2 Hide powder1), containing not more than 0,5 % chromium oxide and with a humidity not more than 13 %. The blank value of the hide powder shall be calculated according to Annex B. 4.3 Gelatine s
30、olution, of 1 g gelatine and 10 g sodium chloride, filled up to 100 ml with distilled water, adjusted to pH 4,7. 5 Apparatus The glass equipment shall be resistant to the action of distilled water. The flasks and tubes shall be Class A. Use normal laboratory equipment and, in particular, the followi
31、ng. 5.1 Desiccator, with an airtight cover and containing silica orange gel. 1) See Annex C. BS EN ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) 2 ISO 2012 All rights reserved5.2 Evaporation dishes, suitable for slowly evaporating water. These shall be short with flat bases and measure 7 cm
32、to 8,5 cm in diameter. Use silver dishes. If this is not possible, preferably use dishes made of stainless steel or, if necessary, ceramic or glass. 5.3 Water bath. 5.4 Drying oven, whose temperature shall be kept at the operating range of (102 2) C. 5.5 Analytical balance, with a precision of 0,2 m
33、g at a load of 200 g. 5.6 Technical balance, with a precision of 0,1 g at a load of 1 000 g. 5.7 Procter bell (see Figure 1), composed of a cylindrical glass bell (length of the cylindrical part: 90 mm 1 mm; internal diameter of the cylindrical part: 28 mm 1 mm). A perforated rubber cork is inserted
34、 into the narrow part of the bell. A capillary glass tube (internal diameter 1,5 mm) with two right-angled bends is inserted into the hole in the cork as shown in Figure 1. The end of the shortest part can fit right down to the base of the cork. Dimensions in millimetres Figure 1 Procter bell BS EN
35、ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) ISO 2012 All rights reserved 35.8 Polyethylene tube, the tube shall be the right size to fit onto the bells capillary glass tube. 5.9 Hoffman clamp. 5.10 1 000 ml volumetric flasks. 5.11 50 ml pipette. 5.12 Vacuum filter system (e.g. Figure 2). F
36、igure 2 Vacuum filter system 5.13 Cellulose acetate membrane filters, with pores of 0,45 m and 3 m. 5.14 50 ml and 100 ml measuring cylinders. 6 Sampling and sample preparation There should be a generous, representative sample of the tanning agents for analysis; this should be thoroughly mixed. If t
37、he particles are heterogeneous, resort to manual or mechanical milling to homogenize the size of the particles. The particle size should not be smaller than 300 m to avoid blocking the Procter bell. BS EN ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) 4 ISO 2012 All rights reserved7 Instrumen
38、tal analysis 7.1 Preparation of the analytical solution 7.1.1 Vegetable tanning agents in powder/solid form Weigh the appropriate quantity (see Table A.1) of vegetable tanning agents on an analytical balance (5.5). Add this to 800 ml of hot (60 C to 80 C) distilled water in a 1 000 ml volumetric fla
39、sk (5.10). Shake the flask to fully dissolve the tanning agents. There may be some residue if there is any insoluble matter in the sample. Leave it to cool down in a water bath at (20 2) C and add distilled water (4.1) up to the mark. The aim is to obtain an analytical solution containing between 3,
40、75 g and 4,25 g of substances absorbed by the hide powder. If the tanning content in the solution goes beyond these limits, repeat the analysis with a sample of suitable quantity. 7.1.2 Vegetable tanning agents in liquid form Weigh the tanning agents on an analytical balance (5.5), taking into accou
41、nt the percentage of content in dry form. Add this to in a 1 000 ml volumetric flask (5.10) containing 800 ml of hot (60 C to 80 C) distilled water. Shake the flask to fully dissolve the tanning agents. There may be some residue if there is any insoluble matter in the sample. Leave it to cool down i
42、n a water bath at (20 2) C and add distilled water (4.1) up to the mark. The aim is to obtain an analytical solution containing between 3,75 g and 4,25 g of substances absorbed in the hide powder. If the tanning content in the solution goes beyond these limits, repeat the analysis with a sample of s
43、uitable quantity. 7.1.3 Synthetic tanning agents in powder form Weigh about (4 0,1) g of tanning agents on an analytical balance (5.5). Add this to a 1 000 ml volumetric flask (5.10) containing 800 ml of hot (40 C to 50 C) distilled water. Shake the flask to fully dissolve the tanning agents. There
44、may be some residue if there is any insoluble matter in the sample. Leave it to cool down in a water bath at (20 2) C and add distilled water (4.1) up to the mark. In the case of breakthrough of the tanning agent (see 7.3), repeat the analysis using a lower mass. Record this deviation in the test re
45、port. 7.1.4 Synthetic tanning agents in liquid form Weigh about (8 0,1) g of tanning agents on an analytical balance (5.5). Add it to a 1 000 ml volumetric flask (5.10) containing 800 ml of hot (40 C to 50 C) distilled water. Shake the flask to fully dissolve the tanning agents. There may be some re
46、sidue if there is any insoluble matter in the sample. Leave it to cool down in a water bath at (20 2) C and add distilled water (4.1) up to the mark. In the case of breakthrough of the tanning agent (see 7.3), repeat the analysis using a lower mass. Record this deviation in the test report. 7.1.5 Ve
47、getable tanning agents organic solvent extracted in powder form Weigh about (4 0,1) g of tanning agents on an analytical balance (5.5). Add this to a 1 000 ml volumetric flask (5.10) containing 800 ml of hot (40 C to 50 C) distilled water. Shake the flask to fully dissolve the tanning agents. There
48、may be some residue if there is any insoluble matter in the sample. Leave it to cool down in a water bath at (20 2) C and add distilled water (4.1) up to the mark. Select the amount in function of the quality of the extract desired. The final concentration of the analytical solution should contain a
49、bout 4 g of tanning compound per litre. BS EN ISO 14088:2012ISO 14088:2012(E) IULTCS/IUC 32:2012(E) ISO 2012 All rights reserved 57.2 Preparation of the bell Place a layer of cotton wool at the top of the bell to prevent the hide powder from entering the capillary tube. Put the rubber cork containing the glass capillary tube in the bell. Weigh 7,0 g of hide powder (4.2) on a technical balance (5.6) and introduce it uniformly in the bell, pressing it down, up to the top of the rim. Check that the h
