Study On Electrochemical Methods For Determination Of Tetrabromobisphenol A

Tetrabromobisphenol A(TBBPA)is the most widely used brominated flame retardant and is widely applied in various polymer materials.It is the most commonly used flame retardant in circuit boards,and it enters the environment through the abandonment of electronic waste and other products.Tetrabromobisphenol A has been detected in environmental media such as soil,air,dust,water and other aquatic organisms,egg-milk foods and even human bodies in many countries all over the world.Tetrabromobisphenol A has high toxicity and it is classified as a Class 2A carcinogen.At present,the detection of tetrabromobisphenol A mainly relies on large-scale instruments,and its detection process is complicated and costly.The development of tetrabrobisphenol A sensor is of great significance for environmental monitoring and national health.This dissertation,aiming at on-line detection of water environment,studies the tetrabromobisphenol A sensor based on electrochemical methods.It has made innovative breakthroughs in highly stable and reusable sensitive electrodes,sensor sensitization methods and pre-enrichment methods.The dissertation proposes a tetrabromobisphenol A detection method and a novel sensor for online detection applications.For solving the common problem of easy passivation at the electrode surface of electrochemical sensor,this dissertation proposes and develops a boron-doped diamond electrode which can be regenerated online.The affinity of carbon-based materials for organic matter can be used to detect tetrabromobisphenol A.The high stability and wide potential window of diamond establishes an electrochemical pretreatment method for the electrode surface,which can conveniently regenerate the surface of the electrode to achieve continuous online detection of tetrabromobisphenol A.In this dissertation,a sensitization method for tetrabromobisphenol A sensor is proposed.A method for detecting tetrabromobisphenol A by a surfactant-sensitized boron-doped diamond electrode is established by using surfactants to enhance the electrochemical activity of the electrode surface.By adding a surfactant such as octadecyltrimethylammonium bromide,the current response of the boron-doped diamond electrode to tetrabromobisphenol A has been enhanced.The detection performance of the sensor has been improved,and the detection limit is 2.5n M.A method for enrichment of tetrabromobisphenol is proposed in this dissertation.Magnetic molecularly imprinted materials were prepared by molecular imprinting technique using tetrabromobisphenol A as template.Through the enrichment and adsorption effect of magnetic molecularly imprinted material on tetrabromobisphenol A,combined with the electrochemical detection method of boron-doped diamond electrode sensitized by surfactants,the lower detection limit of the sensor has been further reduced to 0.25 n M.The work of this dissertation has paced the way for the on-line detection of tetrabromobisphenol A in the field.