title: Analysis of phthalate acid esters in environmental water by magnetic graphene solid phase extraction coupled with gas chromatography-mass spectrometry.
abstract: In this work, magnetic graphene composites were synthesized via a simple hydrothermal reaction. The as-prepared composites were successfully applied as an effective adsorbent for the preconcentration of seven phthalate acid esters (PAEs) in environmental water samples prior to gas chromatography-mass spectrometry (GC-MS) analysis. The magnetic graphene composites had a unique structure in which magnetite particles were deposited on graphene sheets. This unique structure not only provided strong magnetic responsiveness for the separation but also prevented the self-aggregation of graphene. The magnetic graphene composites had several advantages, such as large surface area, fast separation ability, and high peak intensity for aromatic analytes; these properties are attributed to the distinct structure of magnetic graphene composites, which comprises p-conjugated networks with a highly exposed surface. Various parameters, including eluting solvent and volume, absorbent amount, extraction time and elution time, were optimized. Validation experiments showed that the optimized method presented good linearity (r>0.997), satisfactory precision (RSD<8.5%), and high recovery (88-110%). The limits of detection were from 0.010μg/L to 0.056μg/L, and the limits of quantification were from 0.035μg/L to 0.19μg/L. The proposed method had these advantages of simplicity, good sensitivity, and high efficiency. Finally, the proposed was successfully applied to the analysis of PAEs in real water samples.
authors.affiliation: Department of Chemistry, Shangrao Normal University, Shangrao 334001, China. Electronic address: sryq6333@163.com.
authors.forename: Qing
authors.initials: Q
authors.lastname: Ye
authors.affiliation: Department of Chemistry, Shangrao Normal University, Shangrao 334001, China.
authors.forename: Linhai
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Shangrao Normal University, Shangrao 334001, China.
authors.forename: Zhongbao
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Shangrao Normal University, Shangrao 334001, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Hong
mesh_terms: D004952:Esters / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D060328:Magnetic Phenomena; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010795:Phthalic Acids / Q000032:analysis* / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D012997:Solvents / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D004952:Esters; D010795:Phthalic Acids; D012997:Solvents; D014874:Water Pollutants, Chemical; C032279:phthalic acid; D006108:Graphite
keywords: Environmental water; Magnetic graphene; Magnetic solid phase extraction; Phthalate acid esters