Abstract:

A rapid method was developed to simultaneously determine the 22 harmful disperse dyes in textiles, using liquid chromatography-photodiode array-tandem mass spectrometry (LC-PDA-MS/MS). The chlorobenzene vapor reflux extraction method investigated in this paper obtained 2.3~11 times extraction efficiency higher than the ultrasound-assisted methanol extraction method, and the applied of 1.8 µm -column liquid chromatography shortened two thirds of analytical time comparing with the traditional 5µm packed column, and the detection sensitivities were at least increased by 4 times. Furthermore, the ill-defined substance of disperse blue 35(b) in DIN 54231 was identified as dye of disperse blue 26 by electrospray tandem mass spectrometry. The method was evaluated with low quantification limits of 0.8～5 mg/kg for 22 disperse dyes, acceptable recovery of 86.4% - 98.7% and good precision of RSD less than 10%. The harmful disperse dyes, with disperse yellow 23 and orange 37/76 of more frequent, were detected in apparel fabric, lining and some textile accesories such as sewing thread and zip fabric.