Optimized ultrasonic assisted extraction dispersive liquid-liquid microextraction coupled with gas chromatography- electron capture detector for extraction and determination of chlorobenzenes in sludge
Abstract:Ultrasonic assisted extraction dispersive liquid-liquid microextraction (UAE-DLLME) coupled with gas chromatography-electron capture detection (GC-ECD) was applied to extract and determine six different types of chlorobenzenes (CBs) in sludge samples. Acetone was used as extraction solvent for CBs. The effects of various parameters such as ultrasonic time, ionic strength, volume of disperser and extraction solvents as well as extraction types were investigated to determine the optimum conditions for this method. Under the optimum conditions, the method’s coefficients of correlation (r2) were between 0.9993and 0.9999. The relative standard deviations (R.S.D., n = 6) varied between 3.2% and 4.4%. The limits of detection (LODs), based on signal-to-noise (S/N) of 3, were between 0.001and 0.2 μg/kg. The relative recoveries of the six CBs from three sludge samples, S1, S2and S3, were in the range of 89.2%~103.8%, 89.1%~104.3% and 94.5%~112.1%, respectively. It required less analysis time and harmful solvent than the conventional methods. The results showed that UAE-DLLME coupled with GC-ECD was an efficient, sensitive, and reliable method for the determination of CBs in sludge samples.
戴之希, 田立勋, 王国栋, 翁焕新. 超声辅助分散液液微萃取-气相色谱检测污泥中氯苯[J]. 中国环境科学, 2015, 35(2): 471-477.
DAI Zhi-Xi, TIAN Li-Xun, WANG Guo-Dong, WENG Huan-Xin. Optimized ultrasonic assisted extraction dispersive liquid-liquid microextraction coupled with gas chromatography- electron capture detector for extraction and determination of chlorobenzenes in sludge. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(2): 471-477.