Fateme Mohseni Nasrabad - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
Ali Mohammad Haji Shabani - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
Shayeste Dadfarnia - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
Roya Afsharipour - Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.Department of Chemistry, Faculty of Science, University of Jiroft, Jiroft ۷۸۶۷۱۶۱۱۶۷, Iran.
Mohammad Javad Jahanshahi - Department of Chemistry, Faculty of Science, University of Jiroft, Jiroft ۷۸۶۷۱۶۱۱۶۷, Iran.

A solid phase extraction method using magnetic expanded graphite sorbent was proposed for theseparation and preconcentration of acetaminophen. The effect of important parameters on the extraction ofanalyte was studied and optimized. The extracted acetaminophen was measured by gold-silver nanoparticlefunctionalized with polyethyleneimine as a colorimetric sensor. The linear range was achieved in the range of۰.۱-۲۰.۰ μg L-۱ for acetaminophen (R۲ = ۰.۹۹۷۲) with a limit of detection of ۰.۰۲۹ g L-۱. The intra-and inter-dayrelative standard deviations for six measurements at the concentration level of ۵.۰ μg L-۱ acetaminophen werefound to be ۲.۶ and ۴.۲ % respectively

Acetaminophen; Expanded graphite; Gold-silver nanoparticles, Magnetic sorbent