title: Online in-tube microextractor coupled with UV-Vis spectrophotometer for bisphenol A detection.
abstract: A simple and high extraction efficiency online in-tube microextractor (ITME) was developed for bisphenol A (BPA) detection in water samples. The ITME was fabricated by a stepwise electrodeposition of polyaniline, polyethylene glycol and polydimethylsiloxane composite (CPANI) inside a silico-steel tube. The obtained ITME coupled with UV-Vis detection at 278 nm was investigated. By this method, the extraction and pre-concentration of BPA in water were carried out in a single step. Under optimum conditions, the system provided a linear dynamic range of 0.1 to 100 μM with a limit of detection of 20 nM (S/N ≥3). A single in-tube microextractor had a good stability of more than 60 consecutive injections for 10.0 μM BPA with a relative standard deviation of less than 4%. Moreover, a good tube-to-tube reproducibility and precision were obtained. The system was applied to detect BPA in water samples from six brands of baby bottles and the results showed good agreement with those obtained from the conventional GC-MS method. Acceptable percentage recoveries from the spiked water samples were obtained, ranging from 83-102% for this new method compared with 73-107% for the GC-MS standard method. This new in-tube CPANI microextractor provided an excellent extraction efficiency and a good reproducibility. In addition, it can also be easily applied for the analysis of other polar organic compounds contaminated in water sample.
authors.affiliation: Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
authors.forename: Sujittra
authors.initials: S
authors.lastname: Poorahong
authors.forename: Chongdee
authors.initials: C
authors.lastname: Thammakhet
authors.forename: Panote
authors.initials: P
authors.lastname: Thavarungkul
authors.forename: Proespichaya
authors.initials: P
authors.lastname: Kanatharana
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D001559:Benzhydryl Compounds / Q000032:analysis*; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004595:Electroplating / Q000295:instrumentation / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry; D010636:Phenols / Q000032:analysis*; D011092:Polyethylene Glycols / Q000737:chemistry; D015203:Reproducibility of Results; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D000814:Aniline Compounds; D001559:Benzhydryl Compounds; D004129:Dimethylpolysiloxanes; D004785:Environmental Pollutants; D010636:Phenols; D011092:Polyethylene Glycols; C416807:polyaniline; C013830:baysilon; C006780:bisphenol A; D000098826:Bisphenol A Compounds