Citation: Chen Tao, Lin Yao, Li Haochen, Yang Rui, Hou Xiandeng, Zheng Baozhan, Zheng Chengbin. Reduction of mercury(Ⅱ) by electrons contained in carbon dots: An environmentally friendly cold vapor generation for mercury analysis[J]. Chinese Chemical Letters, ;2020, 31(10): 2678-2682. doi: 10.1016/j.cclet.2020.06.005 shu

Reduction of mercury(Ⅱ) by electrons contained in carbon dots: An environmentally friendly cold vapor generation for mercury analysis

Chen Tao ^a ,
Lin Yao ^a ,
Li Haochen ^b ,
Yang Rui ^a ,
Hou Xiandeng ^a,c ,
Zheng Baozhan ^a,*, ,
Zheng Chengbin ^a,*,

a.
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
b.
Chengdu No. 7 High School, Chengdu 610041, China
c.
Analytical & Testing Center, Sichuan University, Chengdu 610064, China

zhengbaozhan@scu.edu.cn

abinscu@scu.edu.cn

Received Date: 28 March 2020
Revised Date: 20 May 2020
Accepted Date: 2 June 2020
Available Online: 3 June 2020

Figures(5)

In this work, the reduction of mercury ions (Hg²⁺) to elemental mercury (Hg⁰) was easily achieved using highly reductive carbon dots (r-CDs), which synthesized from sucrose by a simple and cost-effective method. After a careful mechanistic study, the reduction was probably accomplished with the large numbers of electrons contained in r-CDs rather than the oxidation of its functional groups. Additionally, a 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay showed that the r-CDs were nontoxic to wildlife and human beings. Consequently, the r-CDs were used as an alternative to toxic reductants (SnCl₂ or NaBH₄) for the sensitive and in situ determination of mercury by cold vapor generation (CVG) coupled to a miniature point discharge optical emission spectrometer (μPD-OES). Limit of detection of 0.05 μg/L was obtained for Hg²⁺, with relative standard deviation (RSD) less than 5.4% at a concentration of 5 μg/L. The accuracy of r-CDs induced CVG-μPD-OES was validated by the determination of mercury in a certified reference material (DOLT-5, dogfish liver) and five natural water samples collected from different rivers and lakes in Chengdu City. Since r-CDs are nontoxic and prepared from abundant and inexpensive sucrose, the r-CDs induced CVG-μPD-OES retains the great potential for the inexpensive and environmentally friendly field analysis of mercury in natural water. The accuracy of the proposed method was validated by the analysis of a certified reference material and several water samples with satisfactory results.
- Mercury analysis,
- Reduction,
- Carbon dots,
- Cold vapor generation
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