The modified Hummers method was used to synthetize graphene oxide,a novel nanocomposite of magnetic graphene oxide-gold nanoparticles was synthesized using coprecipitation and self-assembly technique,and the product was dropped on the surface of gold electrode. Then a molecular imprinted polymer film was fabricated by sol-gel technique in the presence of chloramphenicol onto a gold electrode surface. By optimizing experimental conditions,a linear concentration range of 2. 5 × 10-9~ 5. 0 × 10-6mol/L was obta...