STUDY ON COMPLEX OF CU(II) WITH CYCLEN-O-TETRABENZENOTETRAAMIDE BY ELECTROCHEMISTRY

The electrochemical character of a new reagent cyclen-o-tetrabenzenote traamide (CTBTA) with Cu(II) was studied. In C6H4(C2O4HK)-NaOH buffer fer (pH = 4.00), there are three reduction peaks at oscillo-polarogram to the titled complex. Among them, the current of P2 peak at - 0.36 V was directly proportional to the concentration of Cu(II) in the range of 7.5 x 10(-8) - 3.5 x 10(-5) mol/L with a defection limit low to 3 x 10(-8) mol/L. The composition ratio of the complex was formed to be 1:1 using a ratio method and the apparent stability constant to be 1.2 8 x 10(6). The proposed method was highly sensitive and selective and has been directly used to the determination trace amount of copper in rice. (C) 1998 John Wiley & Sons, Inc.