液液萃取—GC-MS法同时测定石化废水中双酚A和邻苯二甲酸二乙酯

建立了液液萃取（LLE）—气相色谱-质谱（GC-MS）法同时测定石化废水中双酚A（BPA）和邻苯二甲酸二乙酯（DEP）的新方法,对液液萃取条件进行了优化。最佳的液液萃取条件为：萃取剂为乙酸乙酯,水样调成酸性（pH<2）,每次加入萃取剂0.1 mL/mL、盐析剂NaCl 0.1 g/mL,萃取次数为6次,每次萃取时间为2 min。实验结果表明：在质量浓度1~100 mg/L的范围内,BPA和DEP测定标准曲线的线性关系良好;BPA和DEP的检出限（LOD）分别为5.18 μg/L和0.89 μg/L,定量限（LOQ）分别为17.11 μg/L和2.96 μg/L,回收率为81.4 %~124.9 %,相对标准偏差（RSD）（n=7）小于5.5 %。

Simultaneous determination of bisphenol A and diethyl phthalate in petrochemical wastewater by liquid-liquid extraction - gas chromatography-mass spectrometry

A method of liquid-liquid extraction（LLE）coupled with gas chromatography-mass spectrometry （GC-MS）for simultaneous determination of bisphenol A（BPA）and diethyl phthalate （DEP）environmental estrogens in petrochemical wastewater was developed,and the conditions of LLE were optimized. The best conditions of LLE were as follows：the extraction solvent ethyl acetate,the sample pH made acidic （pH<2）,the extractant added by 0.1 mL/mL each time,salting-out agent NaCl 0.1 g/mL,6 times of extraction ,and each extraction time 2 min. The experimental results indicated that：In the range of mass concentration was 1-100 mg/L for BPA and DEP,the linearity of their standard curves are good;the limits of detection （LODs）and limits of quantitative （LOQs）were 5.18,17.11 μg/L for BPA and 0.89,2.96 μg/L for DEP,and the average recoveries were in the range of 81.4 %-124.9 % with the relative standard deviation （RSD）less then 5.5% （n=7）.