%0 Conference Proceedings %T Solid-phase microextraction based sol–gel technique using poly(ethylene glycol) grafted multi-walled carbon nanotubes as extracting phase %A Sarafraz Yazdi, Ali %A Amiri, Amir Hassan %A Ronaghi, Gholam Hossein %A Eshtiagh Hosseini, Hossein %J نوزدهمین سمینار شیمی تجزیه ایران %D 2013