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Москвин, Л. Н.; Bulatov, Andrey; Grigor'ev, G. L.; Koldobskii, G. I.

doi:10.1023/a:1025637217985

Cited by 4 publications

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“…The unique way to obtain reliable analytical results for As(III) concentration determination in water is the application of a simple analytical technique allowing its "insitu" quantification. The applied nowadays analytical techniques for arsenic determination are Atomic Absorption Spectroscopy (AAS) (8,9), Inductively Coupled Plasma (ICP) (10), as well as HPLC (11) and Spectrophotometry (12). In spite of the high sensitivity of some of these techniques, they always remain heavy laboratory methods, not applicable for "in-situ" analysis.…”

Section: Introductionmentioning

confidence: 99%

Application of Single-Use PCB Gold Disc Electrodes for "in-situ" Determination of As(III) in Natural Waters

Zlatev¹,

Stoytcheva²,

Valdez³

et al. 2009

ECS Trans.

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A simple and cheap type of disposable Au disc electrodes was developed and fabricated by PCB technology, massively used in electronic industry. This electrodes were successfully applied for "in-situ" As(III) determination in natural ground waters by the Square Wave Anodic Stripping Voltammetry (SWASV). A detection limit of 5.8 μg/L was reached at 20 s deposition time and -480 mV deposition potential. A conductometry based method was developed allowing the achievement of results reproducibility of 7.8 % to 1.5 % for the As(III) concentrations in the range from 5.8 μg/L to 250 μg/L by surface reproducibility correction of the disposable electrodes.

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Section: Introductionmentioning

confidence: 99%

Application of Single-Use PCB Gold Disc Electrodes for "in-situ" Determination of As(III) in Natural Waters

Zlatev¹,

Stoytcheva²,

Valdez³

et al. 2009

ECS Trans.

View full text Add to dashboard Cite

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As(III) Determination in the Presence of Pb(II) by Differential Alternative Pulses Voltammetry

2010

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Differential Alternative Pulses Voltammetry (DAPV), introduced by the authors earlier, was applied with HMDE for direct As(III) determination in the presence of Pb(II) in natural water without sample pretreatment. Distinguishable peaks of As(III) and Pb(II) were registered in 1 M HCl supporting electrolyte at a concentration ratio as high as 1 : 6, while complete peak overlapping occurs applying DPP at any concentration ratio at the same experimental conditions. In-situ As(III) determinations in the presence of Pb(II) in contaminated ground waters in Mexico were performed, using especially designed disposable safe mercury drop electrodes.Keywords: As(III) determination, Differential alternative pulses voltammetry (DAPV), Safe disposable mercury drop electrode, Arsenic DOI: 10.1002/elan.201000090 As(III) and As(V) are among the arsenic species, usually present in the arsenic polluted natural ground and underground waters resulting from the natural processes and the industrial activity of the ore-extracting and mineral processing plants [1 -6]. As(III) is a carcinogenic environmental pollutant, about 10 times more toxic than As(V) [7]. Its limit in drinking water was set by EPA to 10 mg/L. Arsenic contaminated waters often contain other impurities as well and the toxic Pb(II) is frequently one of them [8].The high As(III) toxicity makes the arsenic speciation of a great importance for the ecological expertise. However, reliable As(III) quantification is possible only in situ because of the rapid As(III) oxidation to As(V) by the dissolved oxygen, a process catalyzed by Fe salts [9 -13]. The As(III) oxidation favored by the low pH required by the sample conservation procedures affects the arsenic species equilibrium, thus corrupting the water toxicity results.While the spectral methods as AAS and ICP [14 -19] can not be applied for in situ determinations, the voltammetric techniques as differential pulse polarography (DPP) [20] are suitable for this purpose. They allow the direct in field quantification of As(III) and its distinction from As(V) which is not electrochemically active [21 -24]. A number of authors [2, 19, 25 -35] [32, 42 -44].Acids as 1 M HCl, 1 M H 2 SO 4 , 1 M HClO 4 , 1 M HNO 3 , 1 M H 3 PO 4 , 1 M CH 3 COOH, 1 M tartaric acid, 1 M oxalic acid, etc. were mostly reported as supporting electrolytes for As(III) determination, as well as combined with salts or triton X-100 [45]. The lowest LOD achieved by DPP in 1 M HCl was 0.3 ppb As(III) [25]. However, differential pulse anodic stripping voltammetry (DPASV) application allows attaining a LOD as low as 0.02 ppb, as reported by Forsberg et al. [45].Species as Pb(II), Sn(II), Tl(I), Bi(III), Sb(III), and selenite having E 1/2 close to that of As(III) interfere the As(III) determination causing overlapping of its peak [46]. In 1 M HCl, the most commonly applied supporting electrolyte, the presence of Pb(II) causes complete overlapping of the As(III) peak as shown bellow, thus requiring the application of complicated laboratory sample pretr...

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