Evaluation of Carbon Nanotubes Functionalized Polydimethylsiloxane Based Coatings for In-Tube Solid Phase Microextraction Coupled to Capillary Liquid Chromatography

Chromatography

Neus Jornet-Martínez²  Pascual Serra-Mora²  Yolanda Moliner-Martínez¹  Rosa Herráez-Hernández²  Pilar Campíns-Falcó¹ 

[1] id="af1-chromatography-02-00515">Departamento de Química Analítica, Facultad de Química, Universidad de Valencia. Dr. Moliner 50, E46100 Burjassot, Valencia, Spa

关键词: in-tube solid phase microextraction;    carbon nanotubes;    polydimethylsiloxane;    nitrogen heterocyclic compounds and polycyclic aromatic hydrocarbon;   

DOI  :  10.3390/chromatography2030515

来源: mdpi

【 摘 要 】

In the present work, the performance of carbon nanotubes (c-CNTs) functionalized polydimethylsiloxane (PDMS) based coatings as extractive phases for in-tube solid phase microextraction (IT-SPME) coupled to Capillary LC (CapLC) has been evaluated. Carboxylic-single walled carbon nanotubes (c-SWNTs) and carboxylic-multi walled carbon nanotubes (c-MWNTs) have been immobilized on the activated surface of PDMS capillary columns. The effect of different percentages of diphenyl groups in the PDMS extractive phase has also been evaluated. The extraction capability of the capillary columns has been tested for different organic pollutants, nitrogen heterocyclic compounds and polycyclic aromatic compounds (PAHs). The results indicated that the use of the c-CNTs-PDMS capillary columns improve pyriproxyfen and mainly PAH extraction. Triazines were better extracted by unmodified TRB-35 and modified c-CNTs-PDMS_TRB-5. The results showed that the extraction capability of the c-CNT capillary columns depends not only on the polarity of the analytes (as it occurs with PDMS columns) but also on the interactions that the analytes can establish with the immobilized c-CNTs on the PDMS columns. The extraction efficiency has been evaluated on the basis of the preconcentration rate that can be achieved, and, in this sense, the best c-CNTs-PDMS capillary column for each group of compounds can be proposed.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.