%0 Conference Proceedings %T Multiwalled carbon nanotubes/polypyrrole/SiO2 composite prepared by electrodeposition technique as a new solid phase microextraction sorbent for preconcentrationon of BTEX %A Sarafraz Yazdi, Ali %A Ronaghi, Gholam Hossein %A Vatani, Hossein %A Razavipanah, Iman %A Amiri, Amir Hassan %J بیستمین کنفرانس شیمی تجزیه ایران %D 2014