1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 1833-15:2010Textiles Quantitativechemical analysisPart 15: Mixtures of jute and certain animalfibres (method by determining nitrogencontent) (ISO 1833-15:2006)BS EN ISO
2、 1833-15:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO1833-15:2010. It is identical to ISO 1833-15:2006. It supersedes BS4407:1988 which will be withdrawn on publication of the otherparts of the BS EN ISO 1833 series.The UK participation in its prepar
3、ation was entrusted to TechnicalCommittee TCI/80, Chemical testing of textiles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correc
4、tapplication. BSI 2011ISBN 978 0 580 72136 6ICS 59.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2011.Amendments issued since publicationDate T
5、ext affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1833-15 October 2010 ICS 59.060.01 English Version Textiles - Quantitative chemical analysis - Part 15: Mixtures of jute and certain animal fibres (method by determining nitrogen content) (ISO 1833-15:2006) Textiles - Analyse chimi
6、que quantitative - Partie 15: Mlanges de jute et de certaines fibres animales (mthode par dosage de lazote) (ISO 1833-15:2006) Textilien - Quantitative chemische Analysen - Teil 15: Mischungen aus Jutefasern und bestimmten tierischen Fasern (Bestimmung mittels Stickstoffgehalt) (ISO 1833-15:2006) Th
7、is European Standard was approved by CEN on 12 September 2010. 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 ref
8、erences concerning such national standards may be obtained on application to the CEN 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 responsibility of a CEN membe
9、r into its own language and notified to the CEN 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, Hungary, Iceland, Ireland,
10、 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 NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B
11、-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 1833-15:2010: EBS EN ISO 1833-15:2010EN ISO 1833-15:2010 (E) 3 Foreword The text of ISO 1833-15:2006 has been prepared by Technical Committee ISO/TC 38 “Textil
12、es” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 1833-15:2010 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 by
13、 publication of an identical text or by endorsement, at the latest by April 2011, and conflicting national standards shall be withdrawn at the latest by April 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELE
14、C shall not be held 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
15、, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 1833-15:2006 has bee
16、n approved by CEN as a EN ISO 1833-15:2010 without any modification. BS EN ISO 1833-15:2010ISO 1833-15:2006(E) ISO 2006 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pre
17、paring 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. International organizations, governmental and non-governmental, in
18、 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 rules given in the ISO/IEC Directives, Part 2. The main task
19、 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 least 75 % of the member bodies casting a vote. Attention
20、 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 1833-15 was prepared by Technical Committee ISO/TC 38, Textiles. This first edition of ISO 1833-15 cancels
21、 and replaces Clause 14 of ISO 1833:1977. ISO 1833:1977 will be cancelled and replaced by ISO 1833-1, ISO 1833-3, ISO 1833-4, ISO 1833-5, ISO 1833-6, ISO 1833-7, ISO 1833-8, ISO 1833-9, ISO 1833-10, ISO 1833-11, ISO 1833-12, ISO 1833-13, ISO 1833-14, ISO 1833-15, ISO 1833-16, ISO 1833-17, ISO 1833-1
22、8 and ISO 1833-19. ISO 1833 consists of the following parts, under the general title Textiles Quantitative chemical analysis: Part 1: General principles of testing Part 2: Ternary fibre mixtures Part 3: Mixtures of acetate and certain other fibres (method using acetone) Part 4: Mixtures of certain p
23、rotein and certain other fibres (method using hypochlorite) Part 5: Mixtures of viscose, cupro or modal and cotton fibres (method using sodium zincate) Part 7: Mixtures of polyamide and certain other fibres (method using formic acid) Part 8: Mixtures of acetate and triacetate fibres (method using ac
24、etone) Part 9: Mixtures of acetate and triacetate fibres (method using benzyl alcohol) Part 10: Mixtures of triacetate or polylactide and certain other fibres (method using dichloromethane) Part 11: Mixtures of cellulose and polyester fibres (method using sulfuric acid) Part 12: Mixtures of acrylic,
25、 certain modacrylics, certain chlorofibres, certain elastanes and certain other fibres (method using dimethylformamide) Part 13: Mixtures of certain chlorofibres and certain other fibres (method using carbon disulfide/acetone) BS EN ISO 1833-15:2010ISO 1833-15:2006(E) iv ISO 2006 All rights reserved
26、 Part 14: Mixtures of acetate and certain chlorofibres (method using acetic acid) Part 15: Mixtures of jute and certain animal fibres (method by determining nitrogen content) Part 16: Mixtures of polypropylene fibres and certain other fibres (method using xylene) Part 17: Mixtures of chlorofibres (h
27、omopolymers of vinyl chloride) and certain other fibres (method using sulfuric acid) Part 18: Mixtures of silk and wool or hair (method using sulfuric acid) Part 19: Mixtures of cellulose fibres and asbestos (method by heating) Part 21: Mixtures of chlorofibres, certain modacrylics, certain elastane
28、s, acetates, triacetates and certain other fibres (method using cyclohexanone) The following parts are under preparation: Part 6: Mixtures of viscose or certain types of cupro or modal or lyocell and cotton fibres (method using formic acid and zinc chloride) Part 20: Mixtures of elastane and certain
29、 other fibres (method using dimethylacetamide) Part 22: Mixtures of viscose or certain types of cupro or modal or lyocell and flax fibres (method using formic acid and zinc chlorate) Part 23: Mixtures of polyethylene and polypropylene (method using cyclohexanone) Part 24: Mixtures of polyester and s
30、ome other fibres (method using phenol and tetrachloroethane) BS EN ISO 1833-15:2010INTERNATIONAL STANDARD ISO 1833-15:2006(E) ISO 2006 All rights reserved 1Textiles Quantitative chemical analysis Part 15: Mixtures of jute and certain animal fibres (method by determining nitrogen content) 1 Scope Thi
31、s part of ISO 1833 specifies a method, by determining the nitrogen content, to calculate the proportion of each component, after the removal of non-fibrous matter, in textiles made of binary mixtures of jute and animal fibres. The animal-fibre component may consist solely of hair or wool, or of any
32、mixtures of the two. This part of ISO 1833 is not applicable to products in which dyestuffs or finishes contain nitrogen. NOTE Because this method differs in principle from the general method based on selective solubility set out in ISO 1833-1, it is given in a form that is complete in itself. 2 Nor
33、mative references The following referenced documents are indispensable for the application 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 1833-1, Textiles Quantitati
34、ve chemical analysis Part 1: General principles of testing 3 Principle The nitrogen content of the mixture is determined, and from this and the known or assumed nitrogen contents of the two components, the proportion of each component is calculated. BS EN ISO 1833-15:2010ISO 1833-15:2006(E) 2 ISO 20
35、06 All rights reserved4 Reagents All reagents shall be of recognized analytical reagent quality. 4.1 Toluene. 4.2 Methanol. 4.3 Sulfuric acid, = 1,84 g/ml.1)4.4 Potassium sulfate.1)4.5 Selenium dioxide.1)4.6 Sodium hydroxide solution, 400 g/l. Dissolve 400 g of sodium hydroxide in 400 ml to 500 ml o
36、f water, and dilute to 1 l with water. 4.7 Mixed indicator. Dissolve 0,1 g of methyl red in 95 ml of ethanol and 5 ml of water, then mix with 0,5 g of bromocresol green dissolved in 475 ml of ethanol and 25 ml of water. 4.8 Boric acid solution. Dissolve 20 g of boric acid in 1 I of water. 4.9 Sulfur
37、ic acid, 0,01 mol/l standard volumetric solution. 5 Apparatus Use the apparatus described in ISO 1833-1 together with those given in 5.1, 5.2 and 5.3. 5.1 Kjeldahl digestion flask, capacity 200 ml to 300 ml. 5.2 Kjeldahl distillation apparatus with steam injection. 5.3 Titration apparatus, allowing
38、a precision of 0,05 ml. 6 Sampling and pre-treatment of sample 6.1 Sampling Take a laboratory test sample that is representative of the laboratory bulk sample and sufficient to provide all the specimens, each of about 1 g, that are required. Treat the sample as described in 6.2. 6.2 Pre-treatment of
39、 sample Extract the air-dry sample in a Soxhlet apparatus with a mixture of 1 volume of toluene and 3 volumes of methanol for 4 h at a minimum rate of 5 cycles per hour. 1) These reagents should be free of nitrogen. BS EN ISO 1833-15:2010ISO 1833-15:2006(E) ISO 2006 All rights reserved 3Allow the so
40、lvent to evaporate from the sample in air, and remove the last traces in an oven at (105 3) C. Extract the sample in water (50 ml per gram of sample) by boiling under reflux for 30 min. Filter, return the sample to the flask and repeat the extraction with fresh water. Filter, remove excess water fro
41、m the sample by squeezing, suction, or centrifuging, and then allow the sample to become air-dry. SAFETY PRECAUTIONS The toxic effects of toluene and methanol shall be borne in mind, and full precautions shall be taken in their use. 7 Test procedure Follow the general procedure given in ISO 1833-1 a
42、s regards the selection, drying and weighing of the specimen. Then proceed as follows. Take from the pre-treated sample a test specimen weighing about 1 g. Dry the specimen in a weighing bottle, cool it in a desiccator, and weigh it. Transfer the specimen to the dry Kjeldahl digestion flask, reweigh
43、 the weighing bottle immediately and obtain the dry mass of the specimen by the difference. To the specimen in the digestion flask, add in the following order 2,5 g of potassium sulfate, 0,1 g to 0,2 g of selenium dioxide and 10 ml of sulfuric acid (4.3). Heat the flask, gently at first, until the w
44、hole of the fibre is destroyed, and then more vigorously until the solution becomes clear and almost colourless. Heat for a further 15 min. Allow the flask to cool, dilute the contents carefully with 10 ml to 20 ml of water, cool, transfer the contents quantitatively to a 200 ml graduated flask and
45、make up to volume with water to form the digest solution. Place about 20 ml of boric acid solution in a 100 ml conical flask and place the flask under the condenser of the Kjeldahl distillation apparatus so that the delivery tube dips just below the surface of the boric acid solution. Transfer exact
46、ly 10 ml of digest solution to the distillation flask, add not less than 5 ml of sodium hydroxide solution to the funnel, lift the stopper slightly, and allow the sodium hydroxide solution to run slowly into the flask. If the digest solution and sodium hydroxide solution remain as two separate layer
47、s, mix them by gentle agitation. Heat the distillation flask gently and pass into it steam from the steam injection apparatus (Kjeldahl apparatus). Collect about 20 ml of distillate, lower the receiver so that the tip of the delivery tube is about 20 mm above the surface of the liquid, and distil fo
48、r 1 min more. Rinse the tip of the delivery tube with water, catching the washings in the receiver. Remove the receiver and replace it with a second receiver containing about 10 ml of boric acid solution, and collect about 10 ml of distillate. Titrate the two distillates separately with sulfuric aci
49、d (4.9), using the mixed indicator. Record the total titre for the two distillates. If the titre for the second distillate is more than 0,2 ml, reject the result and repeat the distillation, using a fresh aliquot of digest solution. Carry out a blank determination, i.e. digestion and distillation using the reagents only. BS EN ISO 1833-15:2010ISO 1833-15:2006(E) 4 ISO 2006 All rights reserved8 Calculation and expression of results 8.1 Calculate the percentage nitrogen content in the dry
