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Abstract An analysis method based on solid phase extraction (SPE) coupled with liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) with positive ionization mode has been developed for measuring of seven aniline compounds in environmental water samples. The target compounds were separated on ZORBAX Eclipse Plus C18 (3.5μm,2.1×150mm) column with mobile phases containing acetonitrile and 2mmol/L aqueous ammonium formate. Analytes confirmations were performed using multiple reactions monitoring (MRM) and seven compounds were separated within 7min. The calibration curve was linear in the range 1~1000μg/L. Recovery experiments were performed using MCX extraction cartridge and concentrations varied from 0.8~20μg/L. The recovery rates for target compounds were in the range of 68.5%~102.2%, 71.4%~89.4%, 62.0%~78.3% (RSD < 6.9%, n=3), respectively. Base on the analysis method, the water samples in Yangtze River of Nanjing section at 14sampling site during the flow period (April, 2014), the wet period (August, 2014) and the dry period (December, 2014) were analysed. Four target compounds, including 4-Nitroaniline, 2,6-diethyl-Benzenamine, 3,4-Dichloroaniline and 4-Isopropylaniline, were determined in the water, while 4-Nitroaniline was all determined at 14sampling site during the flow period, the wet period and the dry period. Risk quotient method was utilized to evaluate the environmental risks for 4-Nitroaniline, and the results was low risk levels.
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Received: 05 March 2015
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