BS EN 14362-1-2012 禁用偶氮染料释放芳香胺欧盟测试方法(14)

禁用偶氮染料释放芳香胺欧盟测试方法,替代原-1&-2方法。

BS EN 14362-1:2012

EN 14362-1:2012 (E)

If the three colours do not come from the same part of the textile article, select these three colours from

textile parts made of the same type of textile fibre; If the three colours do not come from the same part of the textile article and do not come from the same

type of textile fibre, select these three colours from textile parts on which the same procedure shall be applied. 8.6.3 Preparation of the three colour test specimen

Each colour shall have approximately the same weight in order to obtain the total mass of 1 g.

If the result of the combined test specimen is in the range between 5 mg/kg and 30 mg/kg of any of the named amines, separate testing is necessary as the result of testing a single colour test specimen may exceed 30 mg/kg. The quantification limits shall be documented for every amine by internal validation procedures.

9 Procedure

9.1 Colorant extraction for disperse dyes

9.1.1 Extraction of disperse dyes with chlorobenzene

The textile specimen dyed with disperse dyes is kept in the extractor according to (7.1) for 30 min above 25 ml boiling chlorobenzene. The chlorobenzene extract is allowed to cool down to room temperature before detaching it from the extractor.

Concentrate the chlorobenzene extract in the evaporation apparatus at a temperature of 45 °C to 60 °C to a small residual quantity. This residue is quantitatively transferred to the reaction vessel with two portions of 1 ml methanol using an ultrasonic bath to disperse the colorant. 9.1.2 Textiles only dyed with disperse dyes

Remove the textile specimen from the extractor and discard it if it is completely made of fibres dyed with disperse dyes and/or becomes decolourised after extraction. 9.1.3 Textiles dyed with disperse dyes and/or other dyes

Remove, from the extractor, the extracted textile specimen if it contains fibres belonging to cases A and/or B (8.4). Remove the solvent by washing the specimen with appropriate solvent e.g. n-pentane (6.5) or t-butyl methyl ether (6.4) and let it dry. If necessary, cut it into small pieces for reductive cleavage. Add the extracted textile specimen to the reaction vessel with the methanolic solution of the dispersed dye (in total 2 ml) for combined reduction.

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9.2 Textiles dyed with dyes other than disperse dyes

If the textile specimen contains fibres belonging only to cases A and/or B (8.4) put the test specimen directly in a reaction vessel and add 2 ml methanol (6.3).

9.3 Reductive cleavage

To the reaction vessel add 15 ml of citrate buffer solution (6.6) preheated to 70 °C. The reaction vessel is tightly closed and treated for (30 ± 1) min at (70 ± 2) °C.

Subsequently, 3,0 ml aqueous sodium dithionite solution (6.7), for reductive cleavage of the azo groups, are added to the reaction vessel, which is then shaken vigorously and immediately kept again at (70 ± 2) °C for another (30 ± 1) min whereupon it is cooled to room temperature (20 °C to 25 °C) within 2 min.

12

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