Determination of lead by stripping voltammetry with a disposable cartridge for quality control of municipal solid waste molten slag

Mongi, Hideyuki; Kida, Akiko; Uchida, Natsuyo; Iwasa, Koichiro; Nakano, Shin-ichi

doi:10.1016/j.microc.2010.09.007

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Pb 2+ ), which can form only labile out-of-plane metalloporphyrins, also the interference of smaller ones (e.g. Cu 2+ ), which form kinetically inert in-plane complexes, can be suppressed by adding of the suitable porphyrins [41]. Using free-base porphyrins, the measurement of pH [42] as well as the humidity [43] can be solved, while for the detection of other molecules, mainly Lewis bases as potential axial ligands, metalloporphyrins can be more effective than free-base porphyrins.…”

Section: Analytical Applications Of Porphyrinsmentioning

confidence: 99%

Application of the electronic spectra of porphyrins for analytical purposes: The effects of metal ions and structural distortions

Valicsek

Horváth

2013

Microchemical Journal

122

118

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We investigated the UV-Vis absorption, singlet-1 and singlet-2 fluorescence, as well as the formation of several metalloporphyrins from equilibrial and kinetic aspects in aqueous solution. Among these complexes were numerous typical out-of-plane and several in-plane metalloporphyrins, and between the two categories, a few border-line cases. On the basis of our results, we have complemented the categorization introduced by Barnes and Dorough for the metalloporphyrins. According to our observations, also in metalloporphyrins, the distortion, i.e., the planarity or nonplanarity of the macrocycle, is basically responsible for the spectral characteristics, while the electronic structure of metal center is a secondary factor, with a considerable importance mainly in the in-plane complexes. The type of complexes can be spectrophotometrically determined on the basis of their UV-Vis absorption and fluorescence spectra. Beside the spectral and photophysical effects of metalation, also those of the structural distortions were studied, which can originate also from metalation, protonation or overcrowded peripheral substitution of the free-base porphyrins, as well as from the axial ligation of metalloporphyrins. Our observation may be useful for different spectrophotometric analytical detection and determination methods, e.g. size-selective metal detection using free-base porphyrins (or other ringed chelate ligands), as well as the determination of Lewis bases as potential axial ligands, using metalloporphyrins.

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Section: Analytical Applications Of Porphyrinsmentioning

confidence: 99%

Application of the electronic spectra of porphyrins for analytical purposes: The effects of metal ions and structural distortions

Valicsek

Horváth

2013

Microchemical Journal

122

118

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“…Redox-MHD with 1,4-benzoquinone was shown here to enhance DPASV signals of Cd(II), Pb(II) and Zn(II) ions for solutions containing 0.5 to 85 ng mL À1 of those ions by inducing convection during the preconcentration step. Detection limits as low as 0.05 ng mL À1 Cd(II) were measured with an accumulation time of only 65 s. This method is more sensitive and has better limits of detection (from 0.05 to 2.2 ng mL À1 ) than those found in previously published papers [45][46][47][48][49][50][51][52][53] where DPASV was used to determine these ions and a stirrer and stir bar provided solution convection. In addition, the detection limit for Cd(II) here is improved by a factor of $30 from that reported previously for redox-MHD, which had $1.5 times the magnetic flux density (1.77 T) for the same deposition period ($60 s) using ASV and a Fe 3+ pumping fluid (at 5 times the concentration, 100 mmol L À1 ).…”

Section: Discussionmentioning

confidence: 91%

Redox magnetohydrodynamics enhancement of stripping voltammetry of lead(ii), cadmium(ii) and zinc(ii) ions using 1,4-benzoquinone as an alternative pumping species

Ensafi

Nazari

Fritsch

2012

Analyst

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Differential pulse anodic stripping voltammetry (DPASV) coupled with redox-magnetohydrodynamics (MHD) is used to enhance the anodic stripping voltammetry (ASV) response using a mercury thin film-glassy carbon electrode. The sensitivity increased to at least a factor of two (at 1.2 T) and is facilitated by using 20.0 mmol L(-1) 1,4-benzoquinone as an alternative pumping species to enhance ASV by redox-MHD. The MHD force formed by the cross-product of ion flux with magnetic field induces solution convection during the deposition step, enhancing mass transport of the analytes to the electrode surface and increasing their preconcentrated quantity in the mercury thin film. Therefore, larger ASV peaks and improved sensitivities are obtained, compared with analyses performed without a magnet. The influence of pH, 1,4-benzoquinone concentration, accumulation potential, and time are also investigated. Detection limits of 0.05, 0.09 and 2.2 ng mL(-1) Cd(II), Pb(II) and Zn(II) were established with an accumulation time of 65 s. The method is used for the analysis of Cd(II), Pb(II) and Zn(II) in different water samples, certified reference materials, and saliva samples with satisfactory results.

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“…Although other analytical methods reported in recent years have been successfully applied for the determination of Pb (II) and Cd(II) in specific samples, special pretreatment or techniques are usually needed. [5][6][7][8][9][10][11][12] Electrochemical methods, especially anodic stripping voltammetry, have great advantages over other techniques in terms of experimental procedure and sensitivity. Among the electrochemical methods, using the mercury film electrode can obtain a good sensitivity for analysis of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of Pb(ii) and Cd(ii) using an electrode modified with electropolymerized thiadiazole film

2012

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The present study reports a sensitive electro-analytical method for the simultaneous determination of trace lead (Pb(II)) and cadmium (Cd(II)) using a non-mercury electrode modified with the electropolymerized thiadiazole film. The electropolymerization of 2,5-dimercapto-1,3,4-thiadiazole on a glassy carbon electrode is carried out, and differential pulse anodic stripping voltammetry for the simultaneous determination of trace Pb(II) and Cd(II) is developed by using this modified electrode as the working electrode. In 0.1 mol L À1 acetate buffer solution at pH 5.5, the stripping peak currents after enrichment at À1.20 V for 300 s showed good linear relationships with Pb(II) and Cd(II) at concentration ranges of 1.00-200 and 0.50-200 mg L À1 , and the detection limits are 0.30 and 0.05 mg L À1 , respectively. The proposed method is applicable to the simultaneous determination of trace Pb(II) and Cd(II) in real water samples with the relative standard deviations of less than 5.7% and the recovery rates of 97.6-106%. The good response of the prepared electrode to Pb(II) and Cd(II) is attributed to the binding of thiol groups and the electrostatic interaction between the modified electrode with metal ions. The findings indicate that the proposed method is helpful in monitoring toxic elements in environmental waters.

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Determination of lead by stripping voltammetry with a disposable cartridge for quality control of municipal solid waste molten slag

Cited by 3 publications

References 22 publications

Application of the electronic spectra of porphyrins for analytical purposes: The effects of metal ions and structural distortions

Application of the electronic spectra of porphyrins for analytical purposes: The effects of metal ions and structural distortions

Redox magnetohydrodynamics enhancement of stripping voltammetry of lead(ii), cadmium(ii) and zinc(ii) ions using 1,4-benzoquinone as an alternative pumping species

Simultaneous determination of Pb(ii) and Cd(ii) using an electrode modified with electropolymerized thiadiazole film

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