Improved detection limits for phthalates by selective solid-phase micro-extraction

Asif I. Zia, Nasrin Afsarimanesh, Li Xie, Anindya Nag, I. H. Al-Bahadly, P. L. Yu, Jürgen Kosel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Presented research reports on an improved method and enhanced limits of detection for phthalates; a hazardous additive used in the production of plastics by solid-phase micro-extraction (SPME) polymer in comparison to molecularly imprinted solid-phase extraction (MISPE) polymer. The polymers were functionalized on an interdigital capacitive sensor for selective binding of phthalate molecules from a complex mixture of chemicals. Both polymers owned predetermined selectivity by formation of valuable molecular recognition sites for Bis (2-ethylhexyl) phthalate (DEHP). Polymers were immobilized on planar electrochemical sensor fabricated on a single crystal silicon substrate with 500 nm sputtered gold electrodes fabricated using MEMS fabrication techniques. Impedance spectra were obtained using electrochemical impedance spectroscopy (EIS) to determine sample conductance for evaluation of phthalate concentration in the spiked sample solutions with various phthalate concentrations. Experimental results revealed that the ability of SPME polymer to adsorb target molecules on the sensing surface is better than that of MISPE polymer for phthalates in the sensing system. Testing the extracted samples using high performance liquid chromatography with photodiode array detectors validated the results.
Original languageEnglish (US)
Title of host publication2015 9th International Conference on Sensing Technology (ICST)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages733-738
Number of pages6
ISBN (Print)9781479963140
DOIs
StatePublished - Mar 30 2016

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