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A chemiluminescence method for the determination of mercury(ii) ions by tuning the catalytic activity of gold nanoparticles with ethylenediamine

Author:
Wang, Meiling, Kong, Yafang, Li, Ying, Huang, Yongxin, Fan, Aiping
Source:
Analytical methods 2019 v.11 no.10 pp. 1317-1323
ISSN:
1759-9679
Subject:
analytical methods, aqueous solutions, catalytic activity, chemiluminescence, cost effectiveness, environmental monitoring, ethylenediamines, health promotion, human health, mercury, metal ions, nanogold, tap water
Abstract:
The development of simple and sensitive detection methods for mercury(ii) ions (Hg²⁺) is crucial for environmental monitoring and human health protection. In the present study, ethylenediamine was found to inhibit the catalytic activity of gold nanoparticles (Au NPs) in the luminol–AgNO₃ chemiluminescence (CL) reaction. Interestingly, the specific binding of Hg²⁺ to the amino groups of ethylenediamine leads to the recovery of the CL signal. Hence, a simple and ultrasensitive CL detection method for the quantitative detection of Hg²⁺ was developed. In principle, the CL signal of the luminol–AgNO₃–Au NPs CL reaction is quenched by ethylenediamine in the absence of Hg²⁺. On the contrary, with the addition of Hg²⁺ to the reaction system, the specific binding of Hg²⁺ to the amino groups of ethylenediamine leads to an enhanced CL intensity. Accordingly, the concentration of Hg²⁺ in the aqueous solution can be quantitatively detected. Under optimal conditions, the linear range for the detection of Hg²⁺ was from 1 fM to 1 pM with a detection limit of 0.54 fM. Also, the developed CL sensing method exhibited a high selectivity toward Hg²⁺ over other metal ions. This cost-effective and ultrasensitive sensing method was applied to determine Hg²⁺ in tap water samples with satisfactory recoveries.
Agid:
6315729