Technique for rapid detection of phthalates in water and beverages

作     者：Zia, Asif I. Rahman, Mohd Syaifudin Abdul Mukhopadhyay, Subhas Chandra Yu, Pak-Lam Al-Bahadly, I. H. Gooneratne, Chinthaka P. Kosel, Juergen Liao, Tai-Shan 

作者机构：Massey Univ Sch Engn & Adv Technol Palmerston North New Zealand King Abdullah Univ Sci & Technol Sensing Magnetism & Microsyst Grp Thuwal Saudi Arabia Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan COMSATS Inst Informat Technol Dept Phys Islamabad Pakistan 

出 版 物：《JOURNAL OF FOOD ENGINEERING》 (食品工程杂志)

年 卷 期：2013年第116卷第2期

页      面：515-523页

核心收录：

学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 

基　　金：COMSATS Institute of Information Technology and Higher Education Commission Pakistan 

主　　题：Interdigital sensors Phthalates DEHP Impedance spectroscopy Constant phase element Electrochemical 

摘      要：The teratogenic and carcinogenic effects of phthalate esters on living beings are proven in toxicology studies. These ubiquitous food and environmental pollutants pose a great danger to the human race due to their extraordinary use as a plasticizer in the consumer product industry. Contemporary detection techniques used for phthalates require a high level of skills, expensive equipment and longer analysis time than the presented technique. Presented research work introduces a real time non-invasive detection technique using a new type of silicon substrate based planar interdigital (ID) sensor fabricated on basis of thin film micro-electromechanical system (MEMS) semiconductor device fabrication technology. Electrochemical impedance spectroscopy (EIS) was used in conjunction with the fabricated sensor to detect phthalates in deionized water. Various concentrations of di(2-ethylhexyl) phthalate (DEHP) as low as 2 ppb to a higher level of 2 ppm in deionized water were detected distinctively using new planar ID sensor based EIS sensing system. Dip testing method was used to obtain the conductance and dielectric properties of the bulk samples. Parylene C polymer coating was used as a passivation layer on the surface of the fabricated sensor to reduce the influence of Faradaic currents. In addition, inherent dielectric properties of the coating enhanced the sensitivity of the capacitive type sensor. Electrochemical spectrum analysis algorithm was used to model experimentally observed impedance spectrum to deduce constant phase element (CPE) equivalent circuit to analyse the kinetic processes taking place inside the electrochemical cell. Curve fitting technique was used to extract the values of the circuit components and explain experimental results on theoretical grounds. The sensor performance was tested by adding DEHP to an energy drink at concentrations above and below the minimal risk level (MRL) limit set by the ATSDR (Agency for Toxic Substances & Disease Registry),