Automated determination of total arsenic in sea water by flow constant-current stripping analysis with gold fibre electrodes

Hua, Chi; Jagner, Daniel; Renman, Lars

doi:10.1016/s0003-2670(00)85343-x

Cited by 54 publications

(35 citation statements)

References 7 publications

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“…Pt, Au, Hg and carbon microelectrodes have been used in stripping analyses for the determination of trace metals by a number of authors. [4][5][6][7][8] In contrast, studies using microelectrodes for the determination of organic species are far less numerous and are restricted to the use of carbon fiber microelectrodes.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Investigation of Cysteamine at Carbon Fiber Microdisk Electrode

El-Hallag

Al‐Youbi

Obaid

et al. 2011

J. Chil. Chem. Soc.

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The electrooxidation of cysteamine compound was carried out using convolutive cyclic voltammetry, linear sweep voltammetry and chronoamperomtry techniques at a carbon fiber microdisk electrode in 0. 1 M perchloric acid. The electrooxidation potential (E 0'' ) of cysteamine occurs at + 0.921 V. The mechanistic pathway of electrooxidation process at carbon fiber microelectrode is loss of 1 electron per molecule. The electrode process is controlled mainly by diffusion. The chemical and electrochemical parameters of the investigated system were determined experimentally and verified theoretically via digital simulation method.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Investigation of Cysteamine at Carbon Fiber Microdisk Electrode

El-Hallag

Al‐Youbi

Obaid

et al. 2011

J. Chil. Chem. Soc.

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“…Recently, the iridium-implanted boron-doped and Au-coated diamond electrodes [24,25] have been used to determine As(III) in phosphate buffer solution and the detection limit (S/N ¼ 3) has been obtained to be 1.5 ppb [24] (Table 1). In practice, the Au electrode has been found to be superior for the detection of arsenic [18 -21, 26 -30] and the limit of detection (LOD) has been achieved to be 0.02 -0.75 ppb [18,19,26] with anodic ASV [26], differential pulse ASV [27] and sonoelectroanalytical methods [19].…”

Section: Introductionmentioning

confidence: 99%

Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

et al. 2008

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The simple, fast and highly sensitive anodic stripping voltammetric detection of As(III) at a gold (Au) nanoparticlemodified glassy carbon (GC) (nano-Au/GC) electrode in HCl solution was extensively studied. The Au nanoparticles were electrodeposited onto GC electrode using chronocoulometric technique via a potential step from 1.1 to 0 V vs. Ag j AgCl j NaCl (sat.) in 0.5 M H 2 SO 4 containing Na [AuCl 4 ] in the presence of KI, KBr, Na 2 S and cysteine additives. Surfaces of the resulting nano-Au/GC electrodes were characterized with cyclic voltammetry. The performances of the nano-Au/GC electrodes, which were prepared using different concentrations of Na[AuCl 4 ] (0.05 -0.5 mM) and KI additive (0.01 -1.0 mM) at various deposition times (10 -30 s), for the voltammetric detection of As(III) were examined. After the optimization, a high sensitivity of 0.32 mA cm À2 mM À1 and detection limit of 0.024 mM (1.8 ppb) were obtained using linear sweep voltammetry.

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“…Arsenic in the mg L À1 concentration range is normally determined by hydride-generation atomic absorption spectrometry or by neutron activation analysis. Both these techniques are somewhat elaborate and not well suited for automated determinations [4]. For this reason, several reports have appeared on electrochemical stripping procedures for the determination of arsenic, since it combines low maintenance costs with good accuracy and precision and excellent sensitivity that allows the determination of low levels of metals without prior treatment.…”

Section: Introductionmentioning

confidence: 99%

“…After the preconcentration step, the elemental arsenic was reoxidized (stripped) chemically with a suitable oxidizing agent present in the solution, gold(III), at a controlled rate [4,15,16]. The working electrode potential (E) was monitored vs. time (t) [23].…”

Section: Introductionmentioning

confidence: 99%

Potentiometric Stripping of Arsenic(III) Using a Wall‐Jet Flow Cell and Gold(III) Solution as Chemical Reoxidant

Muñoz¹,

Palmero²

2004

Electroanalysis

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In the proposed method As(III) is determined with a wall-jet flow cell by means of potentiostatic co-deposition of Au(III) and As(III) at a glassy-carbon electrode and subsequent chemical stripping with Au(III). Factors affecting sensitivity and precision including acidity, Au(III) concentration, electrodeposition potential and flow rate were optimized. Optimum determination of As(III) in solutions containing 160 mg L À1 and 1.2 M hydrochloric acid was accomplished with an electrolysis potential of À 0.1 V (vs. Ag/AgCl) and a flow rate of 0.59 mL min À1. Different linear concentration ranges were achieved under these conditions with good precision and relative standard deviations between 6 -9%. The detection limit obtained after 120 s of electrolysis was 0.55 mg L À1.

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Automated determination of total arsenic in sea water by flow constant-current stripping analysis with gold fibre electrodes

Cited by 54 publications

References 7 publications

Electrochemical Investigation of Cysteamine at Carbon Fiber Microdisk Electrode

Electrochemical Investigation of Cysteamine at Carbon Fiber Microdisk Electrode

Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

Potentiometric Stripping of Arsenic(III) Using a Wall‐Jet Flow Cell and Gold(III) Solution as Chemical Reoxidant

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