Determination of methylmercury in the presence of inorganic mercury by anodic stripping voltammetry

Ireland-Ripert, J.; Bermond, Alain; Ducauze, C.

doi:10.1016/s0003-2670(01)95506-0

Cited by 22 publications

(17 citation statements)

References 11 publications

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“…Other researchers [6,46,33] observed that Hg inorg and MM had the same peak potential for oxidation of Hg 0 , but that their reduction potential are different; they affirmed that it was possible to deposit Hg inorg at the electrode surface at 0 ÷ -0.3 V, whereas more negative potentials (-0.5 ÷ -1 V) are necessary for the reduction of MM.…”

Section: Determination Of Total Mercurymentioning

confidence: 93%

“…Works concerning the application of gold nanoparticle-based electrodes for the quantification of methylmercury have never been published. Many researchers hypothesized that the reduction mechanism of CH 3 Hg + on gold [44] is similar to that proposed at the mercury electrode [33]. A widely accepted mechanism is that of Heaton and Laitinen who studied the reduction of methylmercury at a DME [31].…”

Section: Determination Of Methylmercurymentioning

confidence: 98%

“…In literature we read about different procedures adopted by other researchers to overcome some of these difficulties. Ireland and Ripert recognized that the normal standard addition method would give unsatisfactory results for the determination of methylmercury in the presence of inorganic mercury, and developed the so-called double addition method [33]. With this method we were not able to quantify CH 3 Hg + or Hg 2+ simultaneously present in solution, with a few fortunate exceptions (in the presence of particular CH 3 Hg + /Hg 2+ ratios).…”

Section: Determination Of Total Mercurymentioning

confidence: 99%

“…Several works in literature report the overlap of the peaks of the two mercury species [6,33,45]. Only Ribeiro et al and…”

Section: Determination Of Total Mercurymentioning

confidence: 99%

“…Electrochemical methods for the quantification of trace levels of mercury are usually based on anodic stripping voltammetry using electrodes made of glassy carbon [25], carbon paste [26], chemically modified graphite [27] or gold 5 additions for determining methylmercury in the presence of mercury (II) ions by differential pulse anodic stripping voltammetry at a gold film electrode [33]. Lai et al combined a simple flow-injection system with fast-scan voltammetry in which methylmercury was detected using a Pt microelectrode coated with a thin mercury film.…”

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confidence: 99%

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Voltammetric determination of methylmercury and inorganic mercury with an home made gold nanoparticle electrode

et al. 2009

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This study outlines the development of a procedure for the determination of methylmercury by anodic stripping voltammetry at a gold nanoparticle-modified glassy carbon electrode (AuNPs-GCE) and for the differentiation between methylmercury and inorganic mercury. The signal of methylmercury was measured in the square wave mode using HCl as the supporting electrolyte. The procedure had good accuracy, repeatability and linearity. The determination of total mercury in solutions containing both methylmercury and inorganic mercury was performed after converting the former into the inorganic form. Different sample solution pre-treatments were tested for this purpose, and an acid digestion in a microwave oven with HNO 3 and H 2 O 2 was found to be the most effective. The selective determination of methylmercury in the presence of inorganic mercury was possible after masking the latter through reduction to the elemental state with SnCl 2 . The amount of inorganic mercury was determined by difference.

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Section: Determination Of Total Mercurymentioning

confidence: 93%

Section: Determination Of Methylmercurymentioning

confidence: 98%

Section: Determination Of Total Mercurymentioning

confidence: 99%

“…Several works in literature report the overlap of the peaks of the two mercury species [6,33,45]. Only Ribeiro et al and…”

Section: Determination Of Total Mercurymentioning

confidence: 99%

mentioning

confidence: 99%

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Voltammetric determination of methylmercury and inorganic mercury with an home made gold nanoparticle electrode

et al. 2009

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Selective Determination of Methylmercury by Flow-Injection Fast-Scan Voltammetry

Lai¹,

Huang²,

Zhou³

et al. 1998

Electroanalysis

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A simple flow-injection system, suitable for solution flow rates at microliters-per-minute, has been combined with fast-scan voltammetry for selective determination of methylmercury. A thin Hg film was formed at a Pt microelectrode prior to the measurement. Detection of methylmercury is carried out by measuring the oxidation of methylmercury radicals that have been generated at the Hg microelectrode. At slow scan rates, the electrogenerated methylmercury radicals undergo a follow-up dimerization reaction to form dimethyldimercury (E r C i 2 mechanism). At fast scan rates, it was found that methylmercury radicals can be quantitatively reoxidized (reversible electron-transfer). Optimization of the experimental conditions of the system was performed based on studies of the relationship between the scan rate and the dimerization rate of the methylmercury radical. Under optimized conditions, detection level of subnanomole was obtained with a sample consumption of less than 10 μL and the concentration detection limit for methylmercury at 50 V/s was estimated to be about 0.56 μM. To demonstrate the applicability of this method to automatic analyses, repetitive fast-scan cyclic voltammetry was conducted in conjunction with multiple sample injections. Determination of methylmercury in the presence of excess inorganic mercury was also conducted. This new approach to methylmercury determination was successfully applied to the analysis of elevated dogfish muscle samples.

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Voltammetric Studies on the Electrochemical Reduction of Methylmercury in HCl Aqueous Medium at a Carbon Microelectrode

et al. 2004

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Fast scan voltammetry applied to methylmercury in chloride medium at a carbon fiber microelectrode has shown two cathodic peaks located at À 0.45 and À 1.1 V and a single anodic peak at À 0.33 V (vs. Ag j AgCl). It was concluded that the reoxidation process, at high sweep rates, in acidic media behaves as a reversible one-electron transfer process coupled to a chemical reaction, with the reaction product weakly adsorbed. Good linear calibration plots for the methylmercury determinations in the concentration range from 75 to 300 mM, have been obtained using the currents of the anodic peak measured on the CVs recorded, at 10 V s À1, at a carbon fiber microelectrode, in a stationary solution of methylmercury chloride. Data have shown that the carbon microelectrode, cycled continuously in the analyte, can replace the dropping mercury electrode (DME), with the advantages that the carbon microelectrode is a promising tool for further studies in high resistive media, such as in natural waters.

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Determination of methylmercury in the presence of inorganic mercury by anodic stripping voltammetry

Cited by 22 publications

References 11 publications

Voltammetric determination of methylmercury and inorganic mercury with an home made gold nanoparticle electrode

Voltammetric determination of methylmercury and inorganic mercury with an home made gold nanoparticle electrode

Selective Determination of Methylmercury by Flow-Injection Fast-Scan Voltammetry

Voltammetric Studies on the Electrochemical Reduction of Methylmercury in HCl Aqueous Medium at a Carbon Microelectrode

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