固相微萃取气相色谱法测定水相中邻苯二甲酸二酯

 采用m(聚硅氧烷 (OV 1) )∶m (富勒烯聚二甲基硅氧烷 (PSO C60 ) ) =4∶1的混合固定相自制萃取头 ,利用顶空固相微萃取与气相色谱联用技术 (HS SPME GC)分析了水中 5种邻苯二甲酸二酯。考察了萃取温度、离子强度、吸附和热解吸时间等因素对该方法灵敏度的影响。结果表明该萃取头萃取选择性优于商用PDMS萃取头。方法的检出限为 0 331ng/L～ 12 5 μg/L ;除邻苯二甲酸二正壬酯外 ,相对标准偏差均在 12 %以下。

Determination of phthalic diesters in water by solid phase microextraction-capillary gas chromatography]

The solid phase microextraction (SPME) has the advantages of high efficiency, high sensitivity, simple operation and solvent free operation for analyzing environmental samples. An optical fiber coated with mixed stationary phase of polysiloxane and polymeric fullerene (in ratio of 4:1) was used to extract 5 phthalic diesters by HS-SPME-GC. The operating conditions of SPME such as the extraction temperature, ionic strength of solution, adsorption time and desorption time have been studied. It was compared with commercial polymer coating PDMS fiber through headspace SPME combined with GC. The results indicated that OV-1/PSO-C60 was better than PDMS in extracting high boiling point and semi-volatile phthalic diesters. For phthalic diesters, the detection limits were in the range of 0.331 ng/L-12.5 micrograms/L, and relative standard deviations were below 12% except for dinonyl phthalate.