title: Highly efficient quenching of tris(2,2'-bipyridyl)ruthenium(II) electrochemiluminescence by ozone using formaldehyde, methylglyoxal, and glyoxalate as co-reactants and its application to ozone sensing.
abstract: Most electrochemiluminescence (ECL) systems require high concentrations of quencher to totally quench ECL. In this study, we found that ozone can quench tris(2,2'-bipyridyl)ruthenium(II) ECL using formaldehyde, methylglyoxal, or glyoxalate as co-reactants at a glassy carbon electrode with remarkable efficiencies even when the concentration of ozone is merely 0.25% of that of the co-reactant. The strongest quenching is observed with the tris(2,2'-bipyridyl)ruthenium(II)/formaldehyde ECL system. The tris(2,2'-bipyridyl)ruthenium(II)/formaldehyde ECL intensities decrease linearly with the ozone concentration over the range of 0.025-25 μM (r = 0.9947) with a limit of detection of 8 nM. The method is more sensitive and faster than most methods. It shows high selectivity in the presence of other ROS or oxidants and some metal ions, such as H2O2, ClO(-), Mg(2+), Ni(2+), etc. The method exhibits high recoveries for the detection of ozone in a ventilated photocopy room.
authors.affiliation: School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China. liyh@cust.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Gao
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Liu
authors.forename: Wenjing
authors.initials: W
authors.lastname: Qi
authors.forename: Wenyue
authors.initials: W
authors.lastname: Gao
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Li
authors.forename: Guobao
authors.initials: G
authors.lastname: Xu