| Besides ordinary toxicity, Bisphenol A (BPA) has a potential estrogenic characteristic, and it can act as Estrogen, as an ECDs (Endocrine Disrupting Chemicals). It may cause abnormal phenomena of endocrinium, nervous system, and ect, even cause misshape cancer and mutant, at low dose. As a main material of epoxy resin, polycarbonate and other polymeric materials, BPA is widely used in food container, package and inner coating of food cans. While BPA can migrate from these materials in the process of using and cleaning, which can contaminate food and then even enter the body. Food-borne pollution caused by food materials is one of the crucial ways of entering the human body for BPA. Currently, many countries and regions are calling for a ban on using BPA in food materials. Rapid detection of BPA in food package materials is a important measure to reduce the harms made by BPA.Nowadays, High performance Liquid Chromatography and Gas chromatography are the main methods of detecting BPA. But the two means have many shortcomings, such as:complex operation, expensive, not conducive to real-time detection, doing harm to operator and environment, etc. In comparison, Electrochemical devices are simple; Electrochemical analysis has some advantages:Fast and accurate, conducive to Micro and Trace Analysis, easy to do real-time and continuous detection,and analysis of cost is cheap, etc. The rapid method for determination BPA was carried out by electrochemical method in this pape.Irreverible oxidation is occurred, and in this process, two protons and two electrons transferre on bare gole electrode. In the range of pH=5-8, the peak potential conforms the linear equation:Vp(V)=0.9183-0.0595pH; and the maximum peak current shows at pH=7. In the range of v=0.0025-0.16V/s, the peak current and the scan rate conforms the equation: I(μA)=14.394v1/2+0.0071, R2=0.9994; the peak potential nd the scan rate conforms the equation:Vp(V)=0.0164Ln(v)+0.5834, R2=0.9804. The peak current is linear to the concentration of BPA in the range from 4.39×10-6 to14.39×10-5mol/L,and from 4.39×10-7 to 4.39×10-6 mol/L; and detection limit of 2.19×10-7mol/L(S/N=3).On Gold nanoparticles modified electrode, the maximum peak current shows at pH=7. when pH changes form 5 to8, the peak potential conforms the linear equation:Vp(V)=0.9966-0.0699pH, R2=0.9949. when scan rate changes form 0.005 to 0.16 the peak potential nd the scan rate conforms the equation:Vp(V)=0.0203Ln(v)+0.5916, R2=0.9915; the peak current and the scan rate conforms the equation:I(μA)=18.426v1/2-0.0853, R2=0.9909. The peak current is linear to the concentration of BPA in the range from 2.19×10-7 to 4.39×10-6mol/L, and detection limit of 1.10×10-8mol/L (S/N=3).The two methods mentioned above are used to detect BPA in canned food simulation, and excepet drink cans no BPA is detected. When the adding concentration of BPA is 4.39μmol/L and 0.439μmol/L, the recovery is in the range of 97.7% to 100.7% on the condition of using bare gold electrode as working electrode. On the condition of using gold nanoparticles modified electrode as working electrode, when the adding concentration of BPA is 0.219μmol/L, the recovery is frome 97.7% to100.3%. The relative standard deviation is blow 5%, both of the two methods are suit for detecting remained BPA in food cans. |
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