title: Determination of p-aminobenzenesulfonic acid based on the electrochemiluminescence quenching of tris (2,2'-bipyridine)-ruthenium (II).
abstract: This study describes the quenching effects of p-aminobenzenesulfonic acid (p-ABSA) based on electrochemiluminescence (ECL) of the tris (2,2(') -bipyridyl)-ruthenium(II)(Ru(bpy)3 (2+))/tri-n-propylamine (TPrA) system in aqueous solution. Quenching behaviours were observed with a 200-fold excess of p-ABSA over Ru(bpy)3 (2+). In the presence of 0.1 M TPrA, the Stern-Volmer constant (KSV) of ECL quenching was as high as 1.39 × 10(4) M(-1) for p-ABSA. The logarithmic plot of inhibited ECL versus concentration of p-ABSA was linear over the range of 6.0 × 10(-6) -3.0 × 10(-4) mol/L. The corresponding limit of detection was 1.2 × 10(-6) mol/L for p-ABSA (S/N = 3). The mechanism of quenching is believed to involve an energy transfer from the excited-state luminophore to a dimer of p-ABSA and the adsorption of free radicals of p-ABSA at the electrode surface that impeded the oxidation of the Ru(bpy)3 (2+) /TPrA system.
authors: College of Chemistry and Materials Science, Anhui Normal University, No. 1 Beijing Road, Wuhu, 241000, PR China. ygzhu08@mail.ahnu.edu.cn
authors: Yinggui
authors: Y
authors: Zhu
authors: Baojun
authors: B
authors: Li
authors: Junying
authors: J
authors: Liu
authors: Kun
authors: K
authors: Chen
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D004563:Electrochemistry; D007700:Kinetics; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D012428:Ruthenium / Q000737:chemistry*; D013425:Sulfanilic Acids / Q000737:chemistry*
chemical_list: D013425:Sulfanilic Acids; D015082:2,2'-Dipyridyl; D012428:Ruthenium