title: Determination of 16 polycyclic aromatic hydrocarbons in environmental water samples by solid-phase extraction using multi-walled carbon nanotubes as adsorbent coupled with gas chromatography-mass spectrometry.
abstract: A solid-phase extraction (SPE) using multi-walled carbon nanotubes (MWCNTs) as adsorbent coupled with gas chromatography-mass spectrometry (GC-MS) method was developed for the determination of 16 polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. Several condition parameters, such as extraction adsorbents, elution solvents and volumes, and sample loading flow rate and volume were optimized to obtain high SPE recoveries and extraction efficiency. 150mg MWCNTs as sorbent presented high extraction efficiency of 16 PAHs due to the large specific surface area and high adsorption capacity of MWCNTs compared with the commercial C18 column (250mg/2mL). The calibration curves of 16 PAHs extracted were linear in the range of 20-5000ngL(-1), with the correlation coefficients (r(2)) between 0.9848 and 0.9991. The method attained good precisions (relative standard deviation, RSD) from 1.2% to 12.1% for standard PAHs aqueous solutions; method recoveries ranged in 76.0-125.5%, 74.5-127.0%, and 70.0-122.0% for real spiked samples from river water, tap water and seawater, respectively. Limits of detection (LODs, S/N=3) of the method were determined from 2.0 to 8.5ngL(-1). The optimized method was successfully applied to the determination of 16 PAHs in real environmental water samples.
authors.affiliation: Key Laboratory of Environmental Engineering of Shandong Province, Institute of Environment & Municipal Engineering, Qingdao Technological University, Qingdao 266033, China. majiping2001@yahoo.com.cn
authors.forename: Jiping
authors.initials: J
authors.lastname: Ma
authors.forename: Ronghui
authors.initials: R
authors.lastname: Xiao
authors.forename: Jinhua
authors.initials: J
authors.lastname: Li
authors.forename: Junbao
authors.initials: J
authors.lastname: Yu
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lingxin
authors.initials: L
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D005618:Fresh Water / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006586:Hexanes / Q000737:chemistry; D016014:Linear Models; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D015203:Reproducibility of Results; D012623:Seawater / Q000737:chemistry; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006586:Hexanes; D037742:Nanotubes, Carbon; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D014867:Water; C026385:n-hexane