ISSN 1002-1027　　CN 11-2952/G2

A New Solid-Phase Microextraction with Activated Charcoal Coated Fiber

WANG Yonghua

1. College of Environmental Sciences, Peking University, Beijing, 100871, E-mail: yhwang@urban.pku.edu.cn
• Received:2005-02-16 Online:2006-03-20 Published:2006-03-20

Abstract: A new solid phase microextraction (SPME) fiber coated with porous layer activated charcoal has been developed for the quantification of benzene in gas. There is a linear relationship between the amount of benzene extracted by the SPME coated with porous layer activated charcoal and gas volume (Vg) at ≤100mL of gas phase volume. The linear equation is A=25.815Vg+36.462 with correlation coefficient (R2) of 0.999. The linear equation between amounts of benzene extracted by the SPME coated with porous layer activated charcoal and concentration of benzene (C) in gas phase is A=140.09C+16.24 with correlation coefficient (R2) of 0.996, ranging of concentration from 0.0879 to 52ng·mL-1. The linear equation between the reciprocal of amounts of benzene extracted (1/A) and the reciprocal of gas volume (1/Vg) is 1/A=0.11805/Vg+0.00011, with correlation coefficient (R2) of 0.9999. The extraction recovery and sorption coefficient (K)for benzene are 92.47% and 2.15×106, respectively. The relative standard deviation (RSD) and relative error (RE) are 6.98% and 7.50% for benzene, respectively. Detection limit of 5.86×10-3ng·mL-1 and linear range of 10.4 are measured. The maximum amount of the adsorbed benzene is 2636ng. The results obtained by use of this porous layer activated charcoal fiber are also compared with results obtained by use of a polydimethylsiloxane(PDMS) coated fiber(SUPELCO, USA).