Determination of zinc ion based on electrochemiluminescence of Ru(phen)32+ and phenanthroline

An electrochemiluminescence (ECL) method for determination of zinc ion has been developed based on the enhanced effects of zinc ion on the ECL system of Ru(phen)32+ and phenanthroline (phen). The ECL intensity gradually increased with increasing zinc ion concentration under optimal condition. A linear regression equation (IECL = 213.6lg[Zn2+] + 7003.6; r = 0.99689, n = 5) was obtained over 1.0 × 10−10-1.0 × 10−6 mol L−1 zinc ion, and the detection limit was as low as 1.0 × 10−10 mol L−1. For detection of 1.0 × 10−10, 1.0 × 10−8, and 1.0 × 10−6 mol L−1 spiked zinc ion, the recovery ratio ranged from 101% to 103%, and the relative standard deviations were 2.10%, 0.97%, and 3.20%, respectively. These results demonstrated that the proposed method was effective and showed good reproducibility.