Publication:
Highly sensitive determination of mercury using copper enhancer by diamond electrode coupled with sequential injection-anodic stripping voltammetry

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Issued Date

2014

Resource Type

Article

File Type

application/pdf

ISSN

32670

DOI

10.1016/j.aca.2014.09.011

Other identifier(s)

2-s2.0-84912088240

Rights Holder(s)

Scopus

Bibliographic Citation

Analytica Chimica Acta. Vol 852, (2014), p.55-62

Suggested Citation

Chaiyo S., Chailapakul O., Siangproh W. Highly sensitive determination of mercury using copper enhancer by diamond electrode coupled with sequential injection-anodic stripping voltammetry. Analytica Chimica Acta. Vol 852, (2014), p.55-62. doi:10.1016/j.aca.2014.09.011 Retrieved from: https://hdl.handle.net/20.500.14740/6412

Title

Highly sensitive determination of mercury using copper enhancer by diamond electrode coupled with sequential injection-anodic stripping voltammetry

Author(s)

Chaiyo S.
 Chailapakul O.
 Siangproh W.

Abstract

A highly sensitive determination of mercury in the presence of Cu(II) using a boron-doped diamond (BDD) thin film electrode coupled with sequential injection-anodic stripping voltammetry (SI-ASV) was proposed. The Cu(II) was simultaneously deposited with Hg(II) in a 0.5M HCl supporting electrolyte by electrodeposition. In presence of an excess of Cu(II), the sensitivity for the determination of Hg(II) was remarkably enhanced. Cu(II) and Hg(II) were on-line deposited onto the BDD electrode surface at -1.0V (vs. Ag/AgCl, 3M KCl) for 150s with a flow rate of 14μLs-1. An anodic stripping voltammogram was recorded from -0.4V to 0.25V using a frequency of 60Hz, an amplitude of 50mV, and a step potential of 10mV at a stopped flow. Under the optimal conditions, well-defined peaks of Cu(II) and Hg(II) were found at -0.25V and +0.05V (vs. Ag/AgCl, 3M KCl), respectively. The detection of Hg(II) showed two linear dynamic ranges (0.1-30.0ngmL-1 and 5.0-60.0ngmL-1). The limit of detection (S/N=3) obtained from the experiment was found to be 0.04ngmL-1. The precision values for 10 replicate determinations were 1.1, 2.1 and 2.9% RSD for 0.5, 10 and 20ngmL-1, respectively. The proposed method has been successfully applied for the determination of Hg(II) in seawater, salmon, squid, cockle and seaweed samples. A comparison between the proposed method and an inductively coupled plasma optical emission spectrometry (ICP-OES) standard method was performed on the samples, and the concentrations obtained via both methods were in agreement with the certified values of Hg(II), according to the paired t-test at a 95% confidence level. © 2014 Elsevier B.V.

Subject(s)

Diamond films
 Diamonds
 Electrochemical electrodes
 Inductively coupled plasma
 Mercury (metal)
 Optical emission spectroscopy
 Shellfish
 Silver
 Spectrometry
 Thin films
 Voltammetry
 Anodic stripping voltammetry
 Boron-doped diamond thin film electrode
 Determination of mercuries
 Inductively coupled plasma-optical emission spectrometry
 Linear dynamic ranges
 Sequential injection
 Supporting electrolyte
 Thin-film electrode
 Copper
 Copper
 Diamond
 Mercury
 Sea water
 Anodic stripping potentiometry
 Article
 Atomic emission spectrometry
 Cockle
 Concentration (parameters)
 Controlled study
 Electrode
 Limit of detection
 Measurement precision
 Nonhuman
 Salmon
 Seaweed
 Sequential injection anodic stripping voltammetry
 Squid

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URI

https://hdl.handle.net/20.500.14740/6412

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Scopus: Year 1983-2021

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