Study On The Synthesis Of Organotin Molecularly Imprinted Polymers And The Applications In Marine Environmental Monitoring

Organotin compounds are widely used as biocidal additives in antifouling paints due to their effectiveness. However, they also cause damage to non-target organisms and are regarded as the most toxic material ever deliberately introduced into the sea. The preconcentration, separation and determination of organotin compounds in sea water have become the popular research in analytical science field.Molecular imprinting is a new method to separate medium. The selective recognition of imprinted polymers to the template molecule is obtained through the "memory effect" of the cavities in the polymer which are formed during the polymerization process. With the characteristic of predetermination, recognition and practicability, molecular imprinted polymers (MIPs) are used in many fields.The thesis reported the synthesis of organotin MIPs and the applications in organotin preconcentration and separation. The determination of organotin with morin-modified glassy carbon electrode was also discussed. The thesis includes the main contents as follows:1. Using organotin as the template molecule, chitosan as the functional monomer and glutaraldehyde as the cross-linking monomer, organotin (monobutyltin and dibutyltin) molecularly imprinted polymers were synthesized by the molecular imprinting technology and the structure of MIPs was characterized with scanning electronic microscope. We studied the synthesis conditions of MIPs, the adsorption properties and selective recognition of MIPs for organotin. The experimental results showed that MIPshad high adsorption capacity and good selective recognition for organotin.2. Morin-modified electrode was prepared by electrochemical polymerization. We studied the determination condition for dibutyltin by anodic stripping voltammetry. The results showed the morin could complex with dibutyltin on the electrode surface in 0.05mol·L^-1' HAc-NaAc solution. There was a good linear relationship between the peak current and the dibutyltin concentration in the range of 2～38ng·mL^-1' and the determination limit of dibutyltin was 2ng·mL^-1.