Almeida Cristina M M, Boas Luís Vilas
Faculdade de Farmácia da Universidade de Lisboa, Laboratório de Hidrologia e Análises Hidrológicas, Av. das Forças Armadas, 1649-019 Lisboa, Portugal.
J Environ Monit. 2004 Jan;6(1):80-8. doi: 10.1039/b307053k. Epub 2003 Nov 17.
The analysis of BTEX and other substituted benzenes in water samples using solid phase microextraction (SPME) and quantification by gas chromatography with flame ionization detection (GC-FID) was validated. The best analytical conditions were obtained using PDMS/DVB/CAR fibre using headspace extraction (HS-SPME) at 50 [degree]C for 20 min without stirring. The linear range for each compound by HS-SPME with GC/FID was defined. The detection limits for these compounds obtained with PDMS/DVB/CAR fibre and GC/FID were: benzene (15 ng L(-1)), toluene (160 ng L(-1)), monochlorobenzene (54 ng L(-1)), ethylbenzene (32 ng L(-1)), m-xylene (56 ng L(-1)), p-xylene (69 ng L(-1)), styrene (35 ng L(-1)), o-xylene (42 ng L(-1)), m-dichlorobenzene (180 ng L(-1)), p-dichlorobenzene (230 ng L(-1)), o-dichlorobenzene (250 ng L(-1)) and trichlorobenzene (260 ng L(-1)). This headspace SPME-GC-FID method was compared with a previously validated method of analysis using closed-loop-stripping analysis (CLSA). The headspace SPME-GC-FID method is suitable for monitoring the production and distribution of potable water and was used, in field trials, for the analysis of samples from main intakes of water (surface or underground) and from the water supply system of a large area (Lisbon and neighbouring municipalities).
使用固相微萃取（SPME）对水样中的BTEX和其他取代苯进行分析，并通过火焰离子化检测气相色谱法（GC-FID）进行定量分析，该方法得到了验证。使用PDMS/DVB/CAR纤维，在50℃下进行顶空萃取（HS-SPME）20分钟且不搅拌，可获得最佳分析条件。定义了通过HS-SPME与GC/FID分析每种化合物的线性范围。使用PDMS/DVB/CAR纤维和GC/FID获得的这些化合物的检测限为：苯（15 ng L⁻¹）、甲苯（160 ng L⁻¹）、一氯苯（54 ng L⁻¹）、乙苯（32 ng L⁻¹）、间二甲苯（56 ng L⁻¹）、对二甲苯（69 ng L⁻¹）、苯乙烯（35 ng L⁻¹）、邻二甲苯（42 ng L⁻¹）、间二氯苯（180 ng L⁻¹）、对二氯苯（230 ng L⁻¹）、邻二氯苯（250 ng L⁻¹）和三氯苯（260 ng L⁻¹）。将这种顶空SPME-GC-FID方法与先前验证的使用闭环剥离分析（CLSA）的分析方法进行了比较。顶空SPME-GC-FID方法适用于监测饮用水的生产和分布，并在现场试验中用于分析来自主要水源（地表水或地下水）以及大面积供水系统（里斯本及周边城市）的水样。
