Acetone-activated polyimide electrospun nanofiber membrane for thin-film microextraction and thermal desorption-gas chromatography-mass spectrometric analysis of phenols in environmental water.
In this work, a polyimide nanofiber membrane was electrospun and applied as sorbent for thin film microextraction (TFME). After TFME of phenols in water samples, direct thermal desorption of the sorbent at 300°C followed by gas chromatography-mass spectrometric (TD-GC-MS) analysis was carried out. The extraction efficiency of TFME was enhanced by 6-12 times for phenols after activation with acetone. The positive effect of acetone activation was correlated to the increased hydrophilicity of the membrane. Extraction parameters, including mass of nanofiber membrane, pH value, NaCl concentration and extraction time, were optimized. Under optimal conditions, the LODs and LOQs for analysis of phenols in spiked purified water were 0.0006-0.008 and 0.002-0.025μgL(-1), respectively. The linearity range was more than two orders of magnitude (R>0.99). The RSDs of intra-batch and inter-batch were 4.3-7.4% and 2.7-10.6% (n=3). Finally the method was applied to real samples, including tap water, sea water, and waste water. These results indicate that the polyimide nanofiber membrane is a promising candidate as TFME sorbent for determination of polar analytes in water samples coupled with TD-GC-MS.
Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
Shenghong
S
Li
Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
Dapeng
D
Wu
Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
Xiaohui
X
Yan
Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China. Electronic address: guanyafeng@dicp.ac.cn.
Yafeng
Y
Guan
D000096:Acetone / Q000737:chemistry; D005618:Fresh Water / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D007202:Indicators and Reagents; D057230:Limit of Detection; D008567:Membranes, Artificial; D057139:Nanofibers; D010636:Phenols / Q000032:analysis*; D012117:Resins, Synthetic; D012623:Seawater / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000096:Acetone; D007202:Indicators and Reagents; D008567:Membranes, Artificial; D010636:Phenols; D012117:Resins, Synthetic; D062065:Wastewater; D014874:Water Pollutants, Chemical; C029945:polyimide resin
Acetone; Electrospun; Nanofiber; Phenols; Polyimide; Thin film microextraction (TFME)