Au nanoparticles/carbon sphere(Au/CS)composite was adopted to modify borondoped diamond(BDD)electrode.The electrochemical behavior of Sudan red I on Au/CS-modified BDD electrode was investigated,and the method for testing Sudan red I in practical samples was established accordingly.Results indicate that,as compared with bare BDD electrode, the oxidation peak current of Sudan red I on Au/CS-modified BDD electrode increases from 0.24μA to 0.83μA,and the oxidation peak potential negatively shifts from 0.809Vto...