کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
196731 | 459850 | 2005 | 6 صفحه PDF | دانلود رایگان |

In this paper, the electrochemical behavior of luminol in weakly acidic solution was studied. It is found that Co2+ remarkably enhances the electrochemiluminescence (ECL) of luminol in citric acid–sodium citrate buffer solution (pH = 4.0) when a pulse potential (−1.8 to +1.0 V, versus Ag/AgCl) is applied to the Pt electrode. The selectivity for Co2+ is very good because most of the other water-soluble metal ions do not interfere. A sensitive and selective ECL method for determination of Co2+ is proposed. After optimization of the reaction conditions and electrochemical parameters influencing the relative ECL intensity, the linear range responding to Co2+ is 5.0 × 10−12 to 1.0 × 10−7 mol/L, and the detection limit is 2.0 × 10−12 mol/L. The relative standard deviation for 5.0 × 10−10 mol/L cobalt(II) is 3.7% (n = 11).
Journal: Electrochimica Acta - Volume 50, Issues 16–17, 30 May 2005, Pages 3414–3419