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Determination of Hg 2+ in Tap Water Based on the Electrochemiluminescence of Ru(phen) 3 2+ and Thymine at Bare and Graphene Oxide‐Modified Glassy Carbon Electrodes
Author(s) -
Gao Yulong,
Wang Tao,
Liu Fengyu
Publication year - 2016
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600576
Subject(s) - chemistry , electrochemiluminescence , tap water , detection limit , graphene , thymine , oxide , electrode , glassy carbon , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , electrochemistry , nanotechnology , chromatography , organic chemistry , environmental engineering , dna , cyclic voltammetry , biochemistry , materials science , engineering
The electrochemiluminescence (ECL) of the Ru(phen) 3 2+ /thymine (T) system at bare and graphene oxide (GO)‐modified glassy carbon (GC) electrodes was utilized to determine Hg 2+ in tap water. The ECL intensity of Ru(phen) 3 2+ was considerably enhanced by the addition of thymine because of the occurrence of ECL reaction between them. Subsequently, the ECL intensity of Ru(phen) 3 2+ /T system rapidly decreased with the addition of Hg 2+ because of the formation of a T‐Hg 2+ ‐T complex. A linear response ( R 2 =0.9914) was obtained over a Hg 2+ concentration range of 1.0×10 −9 mol/L to 1.0×10 −5 mol/L with a detection limit of 3.4×10 −10 mol/L at a bare GC electrode in 0.1 mol/L phosphate buffer (pH=8.0). The detection limit can be further reduced to 4.2×10 −12 mol/L after modification of the GC electrode by GO. To verify its applicability, the proposed method was utilized to determine Hg 2+ in tap water and simulated wastewater. The method exhibited good reproducibility and stability and thus reveals the possibility of developing a novel ECL detection method for Hg 2+ .