Ultrasound-assisted matrix solid-phase dispersive liquid extraction for the determination of intermediates in hair dyes with ion chromatography

A novel one-step sample preparation technique called ultrasound-assisted matrix solid-phase dispersive liquid extraction was developed. After sample matrices being dispersed, target analytes were extracted into acid solutions and fat and lipin were dissolved in n-hexane while the interfering components were retained by dispersing sorbent. The extraction process could be rapidly accomplished within 9 min with high sample throughput under the synergistic effects of vibration, ultrasound action and heating. The extraction efficiency of approach was demonstrated for the determination of intermediates in commercial hair dyes with ion chromatography. Linearity ranges of 0.2–100 mg L−1 and detection limits varying from 0.019 to 0.048 mg L−1 were achieved. The recoveries ranged from 85.7 to 107.0% with the relative standard deviations (RSDs) of 0.31–3.7%. These results showed that the method was simple, time-saving, reliable and suitable for the routine analysis of intermediates in large numbers of hair dyes.

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► An UA-MSPDLE was developed for separating dye intermediates.
► Analytes in hair dyes were detected by ion chromatography.
► Extraction and cleanup were integrated into one step to greatly simplify operation.
► Method was accomplished within 9 min with high efficiency under synergistic effects.
► Matrix interferences were eliminated effectively.