Please wait a minute...
J4  2014, Vol. 48 Issue (2): 297-302    DOI: 10.3785/j.issn.1008-973X.2014.02.017
    
Determination of trace mercury in water based on two-electrode system
CAI Pei-jun, DENG Zhi-yin, WANG Xiao-ping
State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou 310027,China
Download:   PDF(812KB) HTML
Export: BibTeX | EndNote (RIS)      

Abstract  

Aiming at the common detection problems of mercury in water, a new detection method was proposed. With gold electrode as working electrode and stainless steel as counter electrode, an integrated electrode was designed and used for mercury determination by stripping voltammetry. Electrode activation, chemical and instrumental variables such as supporting electrolyte, deposition potential and deposition time were optimized. In the optimized experimental conditions, two series of mercury solution with different concentrations were detected. The stripping current was linearly related to the concentration of mercury (Ⅱ) in the range of 1~10μg/L (R2=0.994 1) and 10~90 μg/L (R2=0.999 2), with a detection limitof 0.5μg/L under 600 s accumulation.The integrated electrode was further used to detectmercury in tap water, and the obtained results revealed a good agreement with atomicabsorption spectroscopy (AAS).The new method based on two-electrode system can reliably and accurately detect mercury in water. The integrated electrode is highly sensitive, environmental friendlyand cheap, suitable for promotion and application.



Published: 01 February 2014
CLC:  O 657  
Cite this article:

CAI Pei-jun, DENG Zhi-yin, WANG Xiao-ping. Determination of trace mercury in water based on two-electrode system. J4, 2014, 48(2): 297-302.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.02.017     OR     http://www.zjujournals.com/eng/Y2014/V48/I2/297


基于两电极体系检测水中微量汞

针对水体中常见重金属汞的检测问题,提出基于两电极体系的检测新方法.设计以金电极为工作电极、不锈钢为辅助电极的集成电极,用该电极对汞进行溶出伏安法测定.讨论活化电极、支持电解质、富集电压和富集时间对汞离子测定的影响.在优化的实验条件下,分别对1~10 μg/L和10~90 μg/L 2个不同浓度范围的Hg2+进行测定,溶出峰电流与Hg2+浓度呈良好的线性关系,相关系数分别为0.994 1和0.999 2;当富集时间为600 s时,Hg2+的检出限可以达到0.5 μg/L.利用该方法测定自来水中汞的含量,检测结果与原子吸收法一致,平均回收率为98%.结果表明,基于两电极体系,可以可靠、准确检测出水中汞,且电极灵敏度高、价格低廉,具有推广应用前景.

[1] LEOPOLD K,FOULKES M,WORSFOLD P. Methods for the determination and speciation of mercury in natural waters-a review[J]. Analytica Chimica Acta, 2010,663(2): 127-138.
[2] BONFIL Y,BRAND M,KIROWA-EISNER E. Trace determination of mercury by anodic stripping voltammetry at the rotating gold electrode [J]. Analytica Chimica Acta, 2000, 424(1): 65-76.
[3] MUNOZ R A A,FELIX F S,AUGELLI M A,et al. Fast ultrasound-assisted treatment of urine samples for chronopotentiometric stripping determination of mercury at gold film electrodes[J]. Analytica Chimica Acta, 2006, 571(1): 93-98.
[4] ORDEIG O,BANKS C E,DEL CAMPO J,et al. Trace detection of mercury (II) using gold ultra-microelectrode arrays [J]. Electroanalysis, 2006, 18(6): 573-578.
[5] BERNALTE E,SANCHEZ C M,GIL E P. Determination of mercury in ambient water samples by anodic stripping voltammetry on screen-printed gold electrodes[J]. Analytica Chimica Acta, 2011, 689(1): 60-64.
[6] GONG J,ZHOU T,SONG D,et al. Monodispersed Au nanoparticles decorated graphene as an enhanced sensing platform for ultrasensitive stripping voltammetric detection of mercury (II)[J]. Sensors and Actuators B: Chemical, 2010, 150(2): 491-497.
[7] 胡会利,李宁.电化学测量[M].北京:国防工业出版社, 2007: 216-217.
[8] WINQUIST F,KRANTZRLCKER C,LUNDSTR M I. A miniaturized voltammetric electronic tongue[J]. Analytical Letters, 2008, 41(5): 917924.
[9] WINQUIST F,KRANTZ-RLCKER C,OLSSON T,et al. Measurements of cadmium in soil extracts using multi-variate data analysis and electrochemical sensors[J]. Precision Agriculture, 2009, 10(3): 231-246.
[10] 徐利. 基于两电极体系的电子舌设计和应用研究 [D]. 杭州:浙江大学, 2011: 43-67.
 XU Li.The design and application research of electronic tongue based on two-electrode system[D]. Hangzhou: Zhejiang University,2011: 4367.
[11] 王国顺,吕荣山,施清照译. 电化学分析—溶出伏安法[M].北京:中国计量出版社, 1988: 223.
[12] 付静. 水环境重金属检测的电化学传感器研究[D]. 杭州:浙江大学, 2007: 10-13.
FU Jing.The research of electrochemical sensors for heavy metals monitoring in water Environment[D]. Hangzhou: Zhejiang University,2007: 10-13.
[13] MANDIL A,IDRISSI L,AMINE A. Stripping voltammetric determination of mercury (II) and lead (II) using screen-printed electrodes modified with gold films, and metal ion preconcentration with thiol-modified magnetic particles [J]. Microchimica Acta, 2010, 170(3): 299-305.
[14] NIU X,CHEN C,TENG Y,et al. Novel Screen-Printed Gold Nano Film Electrode for Trace Mercury (II) Determination Using Anodic Stripping Voltammetry[J]. Analytical Letters, 2012, 45(7): 764-773.

No related articles found!