Determination of α-terpineol in aqueous and soil samples using solid-liquid extraction purification coupled with gas chromatography/mass spectrometry
Methods for the determination of typical organic flotation reagent(α-terpineol)in water and soil samples were respectively established using solid phase extraction(SPE)purification and gas chromatography/mass spectrometry(GC-MS).Chromatographic separation of the analyte was performed using DB-5 MS,and its quantitative analysis was performed using electron bombardment(EI)-selected ion monitoring(SIM)and matrix-matched calibrations.Both water and soil samples were extracted with dichloromethane.For water sample,pH and salinity were adjusted to 7.5 and 0.5%,respectively,followed by three times of liquid-liquid extraction using dichloromethane as extractant.For soil sample,dichloromethane was used for oscillatory extraction twice.The extract was evaporated to dryness and then diluted to 1 mL with methanol as the extract.The extracts of water and soil samples were purified by solid phase extraction using a C18 cartridge.Under the optimal extraction conditions described above,the analyte showed a good linear relationship in the concentration range of 0.1～5 mg·L-1(R2≥0.998).Its limit of detection(LOD)was determined as 0.027 mg·L-1 to 0.041 mg·L-1(water samples)and 0.009 mg·kg-1 to 0.054 mg·kg-1(soil samples),respectively.Its recoveries of spiked samples at different concentrations(1,2,5 mg·L-1 or 1,2,5 mg·kg-1)were 91.5%to 112%[Relative standard deviation(RSD)<15%,water samples]and 67%to 114%(RSD<15%,soil samples),respectively.
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