原文由 fddi(fddi) 发表:
原文由 steven(myoak) 发表:
这要看还原和不还原的数值是否一致,如果一致,只能说明样品含有芳香胺,但是没有偶氮染料。
如果碰到19#胺(4-methyl-m-phenylenediamine)要如何判断?还原的话是19#胺,不还原的话是6#胺(5-nitro-o-toluidine)……
另外还有18#胺(o-toluidine)和5#胺(4-amino-2',3-dimethylazobenzene)也是类似情况……
EN14362-1:2012中有提到,
5#胺和6#胺是不稳定的,会分解成18#胺和19#胺,所以楼主这种情况是正常的。
原文:
a The CAS-numbers 97-56-3 (No. 5) and 99-55-8 (No. 6) are further reduced to CAS-numbers 95-53-4 (No. 18) and
95-80-7 (No. 19).
b Azo colorants that are able to form 4-aminoazobenzene, generate under the condition of this method aniline (CASnumber
62-53-3) and 1,4-phenylenediamine (CAS – number 106-50-3). Due to detection limits, only aniline may be
detected. The presence of these colorants should be tested by EN 14362-3.