Trace analysis of UV filters and musks in living fish by in vivo SPME-GC-MS

A method was developed for the simultaneous determination of two groups of personal care products, namely UV filters (oxybenzone, 3-(4-methylbenzylidene)camphor, padimate-O, 2-ethylhexyl-4-methoxycinnamate, and octocrylene) and polycyclic aromatic musks (galaxolide and tonalide), in fish by in vivo solid-phase microextraction followed by gas chromatography-mass spectrometry. The in vivo method was validated by carrying out in vitro experiments; the method validation parameters were linearity (r(2)>0.98), interday precision (relative standard deviations<35.50%), limits of detection and quantification ranging from 2 to 25ngg(-1) and 5 to 70ngg(-1), respectively. The calibrations in vivo and in vitro were determined using a pre-equilibrium sampling rate calibration method. In vivo sampling rate (R-s) was greater than that in vitro; therefore in vivo R-s was applied to the uptake and elimination tracing under controlled laboratory conditions to avoid quantitation error. All analytes were bioaccumulated in muscle tissue over the 5-day exposure in different grades depending on their molecular structure and physicochemical properties; the most absorbed compound was tonalide and the least absorbed compound was padimate-O. The elimination rate was initially high with a rapid decrease of the analyte concentrations for the first 24h; thereafter, the rate of elimination tended to decrease which indicated that the target analytes were bioaccumulated. To our knowledge, this is the first time that UV filters have been analyzed with in vivo SPME-GC-MS. The proposed method is a simple, miniaturized, and non-lethal alternative for the determination of personal care products in living organisms.