摘要
采用顶空固相微萃取(HS-SPME)与气相色谱(GC)联用技术,测定不同温度下苯、甲苯、乙苯、邻二甲苯(BTEX)在聚二甲基硅氧烷(PDMS)和空气之间的分配系数K。根据分配系数K和温度T之间的关系,求得焓变数值。实验结果表明,萃取头的吸附作用是一个放热过程,随着温度的升高,分配系数减小,同时根据logK与1/T的线性关系,计算获得苯、甲苯、乙苯、邻二甲苯的蒸发焓数据,所得数据与文献值接近。
The distribution coefficients（K）of BTEX（including benzene, toluene, ethylbenzene, oxylene） between polydimethylsiloxane （PDMS） fiber and the air at different temperature （T） were determined by headspace solid-phase microextraction/gas chromatography （ HS - SPME/GC ） method. The vaporization enthalpies were calculated based on the relationship between K and T. The results illustrated that the absorption process of BTEX to PDMS was exothermic. The K values decreased when the temperature was increased. There was a linear relationship between logK and I/T. The vaporization enthalpy values of BTEX were calculated from the corresponding slopes. The calculated vaporization enthalpies of BTEX in this study were closed to literature data.
出处
《分析测试学报》
CAS
CSCD
北大核心
2008年第9期994-997,共4页
Journal of Instrumental Analysis
基金
广东省环境污染控制与修复技术重点实验开放研究基金项目
关键词
顶空固相微萃取
气相色谱
分配系数
聚二甲基硅氧烷
苯
甲苯
乙苯
邻二甲苯
headspace solid-phase microextraction（ HS - SPME ）
gas chromatography （ GC ）
distribution coefficient
PDMS
benzene
toluene
ethylbenzene
o-xylene
