Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

Muratt, Diana Tomazi; Carvalho, Leandro Machado de; Viana, Carine; Nascimento, Paulo Cı́cero do; Reis, Gabriel Moraes; Molin, Thaís Ramos Dal; Grassmann, Carla; Smidt, Geerd; Koschinsky, Andrea

doi:10.1002/elan.201500089

Cited by 8 publications

(9 citation statements)

References 39 publications

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“…By using the hanging mercury drop electrode (HMDE), C. Locatelli has reported the sequential determination of platinum group metals and lead 44, 45 and the determination of ultra‐trace osmium, ruthenium and iridium 46 in surface water and environmental samples. Recently, the sequential determination of 13 elements was performed in HMDE with mixed complexing electrolytes 47, similarly to C. M. G. van den Berg previous work published in 1997 48. However, because of the toxicity of mercury, regulations may restrict the use of mercury as an electrode material.…”

Section: Introductionmentioning

confidence: 99%

Sequential Voltammetric Determination of Uranium, Cadmium and Lead by Using the ex situ Bismuth Film Electrode: Application to Phosphate Fertilizers

et al. 2015

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[b] 1IntroductionThere is agrowing interest in the impact of agriculture related activitieso ns oil and water quality.P ractices like fertilization, irrigation and application of pesticides are considered potential sources of introduction and deposition of certainh eavy metals and other elements in the environment [1][2][3][4].Phosphate fertilizers are manufactured from rock phosphates and according to their origin they may contain various major and trace elements,n aturally occurring radionuclides and their decay products. Usually,there is apositive correlation between the uraniuma nd the phosphate contenti nr aw material from sedimentary rocks [5,6]. Despite the unquestionablerequirement of phosphate fertilizers,t he application of fertilizers derived from naturally enriched uraniump hosphate rocks configures an anthropogenic source of this analyte [7][8][9][10].S ince an expressiveuranium concentration has been reported in sedimentary phosphate rocks (30-120mgUkg À1)a nd continuous application of manufacturedp roducts has been performed worldwide in many cultures,t he radionuclide levels are expected to rise over the following years [7,11]. Thus,t he determination of uraniuma nd trace elements such as cadmium and lead in phosphate fertilizersi si mportant, considering that processes like biomagnification and bioaccumulation may occur.Since trace uranium monitoring is significant because of its chemical and radiologic toxicity [ 5,9,[12][13][14][15],e fforts have been devoted for developing sensitive analytical methods applied to uraniumq uantification [16][17][18][19][20][21][22]. Because of their portable character, rapidity,s implicity and sensitivity, voltammetric techniques are especially suitable for this purpose.I np articular,a dsorptive stripping voltammetry (AdSV) has been widely used for trace metal analyses [23][24][25] Thee lectrochemical stripping analysis of tracem etals such as cadmium and lead is widely reported [23,25].A lthough AdSV has been found usefulf or the monitoring of e.g. cadmium concentrations [38],t he anodic stripping voltammetry (ASV) has been commonlye mployed by using the bismuth film electrode (BiFE) [39][40][41][42][43]s ince cadmium and lead signals are ideally placed in the electrode operational potential window [39].With respect to stripping analyses,t here are many published procedures with respect to sequential voltammetric determinations.T he employment of mercury as working electrode is predominant due to the high performance. By using the hangingm ercury drop electrode (HMDE), C. Locatelli has reported the sequential determination of platinum group metals and lead [44,45] and the determiAbstract:Asequential voltammetric procedure for the determination of uranium, cadmium and lead wasi nvestigated at an ex situ bismuth film electrode (BiFE). First, the adsorptive stripping voltammetry was applied to assay the U(VI)-cupferron complexi nt he differential pulse mode (detection limit of 1.0 mgL À1 ,2 00 sa ccumulation time). Through the manipulation of the same aliquo...

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Section: Introductionmentioning

confidence: 99%

Sequential Voltammetric Determination of Uranium, Cadmium and Lead by Using the ex situ Bismuth Film Electrode: Application to Phosphate Fertilizers

et al. 2015

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Section: Determination Of Thallium By Voltammetry In Dietary Supplementsmentioning

confidence: 99%

“…The determination of thallium using DTPA as a complexing reagent has been well mechanistically described for the electrochemical analysis by voltammetry in liquid and solid matrices [25,41]. The voltammetric approach performed in acetate buffer (pH 4.6) involving an electrochemical preconcentration step followed by a stripping step from the electrode surface allows the sensitive determination of total thallium as Tl(I) [25,42]. Concerning the Tl species, Tl(I) is thermodynamically more stable than Tl(III) in almost all environmental and biological systems, while Tl(III) only exists under extremely oxidizing and highly alkaline conditions [43].…”

Section: Determination Of Thallium By Voltammetry In Dietary Supplementsmentioning

confidence: 99%

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Investigation of Thallium as a Contaminant in Dietary Supplements Marketed for Weight Loss and Physical Fitness

Tessele,

Molin,

Dognini

et al. 2023

Preprint

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Dietary supplements are drastically growing as a category of consumer products all over the world. The abuse of supplements marketed for slimming purposes and physical fitness has been observed worldwide in recent years, which raises concerns in terms of public health. In this study, different types of dietary supplements marketed and delivered through the e-commerce were studied for the determination of thallium as a hazardous inorganic contaminant. The total content of thallium was determined by a sensitive voltammetric method after a microwave-assisted oxidative digestion of the sample. In addition, a comparative spectrometric method was applied for validation of the results in the samples. The maximum concentration found for thallium was found to be 2.89 mg kg−1, which well agree with the comparative measurement. Considering the 32 studied formulations, it can be pointed out that ~ 24% of the of dietary supplements presented Tl concentrations at concentrations higher than 1 mg kg−1. The results permitted the assessment of the health risk related to thallium from contaminated samples, based on the calculation of the estimated daily intake (EDI) and the risk quotient (HQ). The highest daily intake of thallium was calculated as 82.0 µg day−1 in a protein-based supplement, which is equivalent to an EDI of 1.17 µg kg−1 day−1. This work highlights the need to develop regulations on the limits of toxic elements as thallium in widely consumed dietary supplements, as well as an in-depth look at the adverse effects caused by this element in the human body.

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“…However, the sensitivities of these methods remain poor. The voltammetric response of an electroactive ligand that forms a complex with Al(III) were changed in the presence of Al(III), which provides an indirect electrochemical strategy for the determination of Al(III) [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. There also are a few biosensors developed for Al(III) [ 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Determining of Ultra-Trace Aluminum Ion in Environmental Samples by Liquid Phase Microextraction Assisted Anodic Stripping Voltammetry

Zhang

Luo

Shen

et al. 2018

Sensors

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Direct detecting of trace amount Al(III) in aqueous solution by stripping voltammetry is often frustrated by its irreversible reduction, resided at −1.75 V (vs. Ag/AgCl reference), which is in a proximal potential of proton reduction. Here, we described an electroanalytical approach, combined with liquid phase microextraction (LPME) using ionic liquid (IL), to quantitatively assess trace amount aluminum in environmental samples. The Al(III) was caged by 8-hydroxyquinoline, forming a superb hydrophobic metal–chelate, which sequentially transfers and concentrates in the bottom layer of IL-phase during LPME. The preconcentrated Al(III) was further analyzed by a square-wave anodic stripping voltammetry (SW-ASV). The resulting Al-deposited electrodes were characterized by scanning electron microscopy and powder X-ray diffraction, showing the intriguing amorphous nanostructures. The method developed provides a linear calibration ranging from 0.1 to 1.2 ng L−1 with a correlation coefficient of 0.9978. The LOD attains as low as 1 pmol L−1, which reaches the lowest report for Al(III) detection using electroanalytical techniques. The applicable methodology was implemented for monitoring Al(III) in commercial distilled water.

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Sequential Determination of 13 Elements in Complex Matrices by Stripping Voltammetry with Mixed Complexing Electrolytes

Cited by 8 publications

References 39 publications

Sequential Voltammetric Determination of Uranium, Cadmium and Lead by Using the ex situ Bismuth Film Electrode: Application to Phosphate Fertilizers

Sequential Voltammetric Determination of Uranium, Cadmium and Lead by Using the ex situ Bismuth Film Electrode: Application to Phosphate Fertilizers

Investigation of Thallium as a Contaminant in Dietary Supplements Marketed for Weight Loss and Physical Fitness

Quantitative Determining of Ultra-Trace Aluminum Ion in Environmental Samples by Liquid Phase Microextraction Assisted Anodic Stripping Voltammetry

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