title: Application of graphene nanoplatelets silica composite, prepared by sol-gel technology, as a novel sorbent in two microextraction techniques.
abstract: In this study, the application of a novel nanomaterial composite was investigated in two microextraction techniques of solid-phase microextraction and a needle trap device in a variety of sampling conditions. The optimum sampling temperature and relative humidity were 10°C and 20%, respectively, for both techniques with two sorbents of graphene/silica composite and polydimethyl siloxane. The two microextraction techniques with the proposed sorbent showed recoveries of 95.2 and 94.6% after 7 days. For the needle trap device the optimums desorption time and temperature were 3 min at 290°C and for SPME these measures were 1 and 1.5 min at 240-250°C for the graphene/silica composite and polydimethyl siloxane, respectively. The relative standard division obtained in inter- and intra-day comparative studies were 3.3-14.3 and 5.1-25.4, respectively. For four sample the limit of detection was 0.021-0.25 ng/mL, and the limit of quantitation was 0.08-0.75 ng/mL. The results show that the graphene/silica composite is an appropriate extraction media for both techniques. Combining an appropriate sorbent with microextraction techniques, and using these in conjunction with a sensitive analytical instrument can introduce a strong method for sampling and analysis of occupational and environmental pollutants in air.
authors.affiliation: Department of Occupational Health, School of Health, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Heidari
authors.affiliation: Department of Occupational Health, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Abdolrahman
authors.initials: A
authors.lastname: Bahrami
authors.affiliation: Department of Chemistry, Faculty of Science, Lorestan University, Khoramabad, Iran.
authors.forename: Ali Reza
authors.initials: AR
authors.lastname: Ghiasvand
authors.affiliation: Department of Occupational Health, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Farshid Ghorbani
authors.initials: FG
authors.lastname: Shahna
authors.affiliation: Department of Biostatistics and Epidemiology, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Ali Reza
authors.initials: AR
authors.lastname: Soltanian
authors.affiliation: Department of Occupational Health, School of Health, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Rafieiemam
keywords: Carbon tetrachloride; Nano-platelets graphene; Needle trap device; Sol-gel technology; Solid-phase microextraction