title: Heat-shrink tubing as a solid-phase microextraction coating for the enrichment and determination of phthalic acid esters.
abstract: Heat-shrink tubing, which shrinks in one plane only (its diameter) when heated, commonly used for sealing protection in electrical engineering, was found to be able to function as a solid-phase microextraction coating. Its utility was demonstrated for the determination of phthalic acid esters in an aqueous solution combined with high-performance liquid chromatography equipped with a UV absorbance detector. The preparation procedure was rather simple and only ∼10 min was needed. The fiber cost is extremely low (∼10 cent each). The parameters affecting the extraction were optimized. Heat-shrink tubing fiber exhibited a significant enrichment effect for the three examined phthalic acid esters and up to 931-fold enrichment factor was obtained. The limit of detection was <10 μg/L for all analytes. The operation repeatability and fiber-to-fiber reproducibility were 1.2-8.3 and 5.4-9.1%, respectively. It was successfully applied for the analysis of bottled drinking water with recoveries ranging from 90.1-100.5%.
authors.affiliation: School of Pharmacy, East China University of Science and Technology, Shanghai, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Luo
authors.forename: Chengxia
authors.initials: C
authors.lastname: He
authors.forename: Feifang
authors.initials: F
authors.lastname: Zhang
authors.forename: Hailong
authors.initials: H
authors.lastname: Wang
authors.forename: Bingcheng
authors.initials: B
authors.lastname: Yang
authors.forename: Xinmiao
authors.initials: X
authors.lastname: Liang
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004952:Esters / Q000032:analysis*; D006358:Hot Temperature; D010316:Particle Size; D010795:Phthalic Acids / Q000032:analysis*; D052617:Solid Phase Microextraction; D013056:Spectrophotometry, Ultraviolet; D013499:Surface Properties
chemical_list: D004952:Esters; D010795:Phthalic Acids; C032279:phthalic acid
keywords: Fibers; Heat-shrink tubing; Phthalic acid esters; Solid-phase microextraction