Determination of Trace Amounts of Thallium by Adsorptive Cathodic Stripping Voltammetry with Xylenol Orange

Shams, Esmaeil; Yekehtaz, Mehdi

doi:10.2116/analsci.18.993

Cited by 11 publications

(13 citation statements)

References 24 publications

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“…These methods are amenable to many interferences, and are generally hampered by insufficient sensitivity. Inductively coupled plasma mass spectrometry, 10 anodic stripping voltammetry, 11 neutron activation analysis 12 and furnace atomic absorption analyses 13 are mostly used for very low analyte levels. However, these techniques are time consuming, not free from matrix effects, and/or need very expensive facilities and daily maintainenance.…”

Section: Introductionmentioning

confidence: 99%

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

Abou‐El‐Sherbini

Mostafa

Hassanien³

2003

ANAL. SCI.

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A new sensitive chromogenic reagent, 9,10-phenanthaquinone monoethylthiosemicarbazone (PET), has been synthesized and used in the spectrophotometric determination of Tl(III). In HNO3, H2SO4 or H3PO4 acids, PET can react immediately at room temperature with Tl(III) to form a red 2:1 complex with a maximum absorption at 516 nm. The different analytical parameters affecting the extraction and determination processes have been examined. The calibration curve was found to be linear over the range 0.2 -10 µg cm -3 with a molar absorptivity of 2.2 × 10 4 dm 3 mol -1 cm -1 . Sandell's sensitivity was found to be 0.0093 µg cm -2 . No interference from macroamounts of foreign ions was detected, except for Pd(II). However, Pd(II) does not affect the determination process, because its complex with PET has its λmax at 625 nm. The proposed method has been applied to the determination of Tl(I and III) in synthetic and natural samples after separation by flotation (in oleic acid/kerosene) and solid-phase extraction (on polyurethane foam) techniques. The two methods were found to be accurate and not subject to random error, but solid-phase extraction was preferred because it is cheap, simpler and there is no contamination risk coming from flotation reagents.

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Section: Introductionmentioning

confidence: 99%

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

Abou‐El‐Sherbini

Mostafa

Hassanien³

2003

ANAL. SCI.

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“…Similar behavior was reported previously. 20,[33][34][35] It should be noted that, in the absence of TPN ligand, low cathodic stripping peak current densities for Cu 2+ , Bi 3+ and Pb 2+ ions were observed (Fig. 2b).…”

Section: Effect Of Accumulation Potentialmentioning

confidence: 96%

Simultaneous Determination of Copper, Bismuth and Lead by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

2006

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A novel, sensitive and selective adsorptive stripping procedure for simultaneous determination of copper, bismuth and lead is presented. The method is based on the adsorptive accumulation of thymolphthalexone (TPN) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. The influences of control variables on the sensitivity of the proposed method for the simultaneous determination of copper, lead and bismuth were studied using the Derringer desirability function. The optimum analytical conditions were found to be TPN concentration of 4.0 μM, pH of 9.0, and accumulation potential at -800 mV vs. Ag/AgCl with an accumulation time of 80 s. The peak currents are proportional to the concentration of copper, bismuth and lead over the 0.4 -300, 1 -200 and 1 -100 ng mL -1 ranges with detection limits of 0.4, 0.8 and 0.7 ng mL -1 , respectively. The procedure was applied to the simultaneous determination of copper, bismuth and lead in the tap water and some synthetic samples with satisfactory results.

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“…XO has been used for AdSV determination of several metals that do dissolve in the electrode volume, e.g. Pb(II) [20], Tl(I) [21], Cu(II) [22], Cd(II) [23], and Zn(II) [23], as well as some that do not, e.g. La(III) [24] and Ti(III) [25].…”

Section: Selection Of ML Ad Systemmentioning

confidence: 99%

Adsorptive stripping chronopotentiometry (AdSCP). Part 2: Basic experimental features

Town

Leeuwen

2007

Journal of Electroanalytical Chemistry

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Determination of Trace Amounts of Thallium by Adsorptive Cathodic Stripping Voltammetry with Xylenol Orange

Cited by 11 publications

References 24 publications

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

A New Selective Chromogenic Reagent for the Spectrophotometric Determination of Thallium(I) and (III) and Its Separation Using Flotation and the Solid-Phase Extraction on Polyurethane Foam

Simultaneous Determination of Copper, Bismuth and Lead by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

Adsorptive stripping chronopotentiometry (AdSCP). Part 2: Basic experimental features

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