Sonoelectroanalytical Detection of Ultra‐Trace Arsenic

Simm, Andrew O.; Banks, Craig E.; Compton, Richard G.

doi:10.1002/elan.200403110

Cited by 67 publications

(35 citation statements)

References 32 publications

(24 reference statements)

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“…Analysis of the data in Figure 1 reveals a plot of V arsenic À1 versus [As 3 + ] À1 is linear suggesting a Langmuirian nature of adsorption with K estimated as of 1.46 10 À6 M À1 which is in good agreement with our previous studies [37] on a gold macroelectrode. This clearly indicates that a gold ensemble can act similar to that of a large gold macroelectrode in terms of analytical sensing despite the surface is only fractionally covered.…”

Section: Resultssupporting

confidence: 80%

Gold Nanoparticle Modified Screen Printed Electrodes for the Trace Sensing of Arsenic(III) in the Presence of Copper(II)

et al. 2010

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Gold ensembles for the trace level sensing of arsenic(III) in the presence of copper(II) are reported. The gold ensembles are fabricated using citrate capped gold nanoparticles which are chemically synthesised in an aqueous solution with an aliquot of this simply cast onto an economical and disposable screen printed electrode. After drying at room temperature, the gold ensembles are ready for use. The gold ensembles are explored towards the sensing of arsenic(III) in the presence of copper(II) using anodic stripping voltammetry where the corresponding stripping peaks are well resolved and using this protocol it is possible to readily detect 3 mg L À1 (3 ppb) with a detection limit of 0.4 mg L À1 (0.4 ppb). Proof-of-concept is also shown for the sensing of arsenic(III) in a canal water sample. Given the low cost of the sensor and ease of fabrication, the gold ensembles hold promise for the sensing of arsenic(III) in water samples where copper(II) may be present.

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Section: Resultssupporting

confidence: 80%

Gold Nanoparticle Modified Screen Printed Electrodes for the Trace Sensing of Arsenic(III) in the Presence of Copper(II)

et al. 2010

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“…From ten additions a limit of detection was found to be 6.3 (AE 3) Â 10 À7 M with a sensitivity of 2.6 ( AE 1) A M À1 , the response was found to be linear in the range 2 to 20 mM. This compares with previous studies at a gold electrode [25] where an LOD of 1.8 Â 10 À7 M with a sensitivity of 0.87 A M À1 was found under similar conditions.…”

Section: Limit Of Detectionsupporting

confidence: 79%

“…It has been shown to significantly enhance the sensitivity for trace metal detection using stripping analysis due to its increased mass transport regime. In a previous paper [25] we showed how the use of ultrasound for arsenic detection at a gold electrode was able to increase the level of sensitivity such that detection of arsenic levels below the WHO limit was then possible. We have applied the same technique to arsenic detection at a gold electrode.…”

Section: Ultrasound Assisted Asv Of As(iii) At a Silver Macroelectrodementioning

confidence: 98%

The Electrochemical Detection of Arsenic(III) at a Silver Electrode

2005

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A study of three electrode substrates namely gold, platinum and silver, for arsenic detection via anodic stripping voltammetry is reported. Hitherto it has been accepted that gold is the most suitable metallic surface for use in this context, as suggested by Forsberg and co-workers (Forsberg, G.; OLaughlin, J. W.; Megargle, R. G. Anal. Chem. 1975Chem. , 47, 1586. We revisit these experiments and find that by switching from hydrochloric acid to nitric acid the oxidation of silver that had previously masked the arsenic stripping signal at this surface is shifted considerably enough to allow a clear, analytically reliable As(III) stripping signal to be detected. In contrast to silver and gold platinum is found to have poor performance as an electrode substrate for arsenic detection. Using ASV a LOD of 6.3 Â 10 À7 M is found for As(III) detection at a silver electrode, similar to that which we have previously reported at a gold electrode (A. O. Simm, C. E. Banks and R. G. Compton. Electroanalysis, 2005, 17, 335.) The use of ultrasound was then investigated to further reduce the LOD, which was found to be 1.4 Â 10 À8 M. Apart from reduced cost of silver it also has an added advantage over gold in that it has a higher hydrogen reduction overvoltage enabling a 100 mV more negative deposition potential to be used before the onset of hydrogen evolution when compared to a gold electrode.

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“…Using 30 s as deposition time in all the considered range, the peak height increased up to 5 µgl -1 , then the response slowly and gradually flattened off, yielding a very low correlation coefficient (R 2 = 0.9534). The decrease in sensitivity at relatively high concentrations of As is caused by a coating of the electrode surface with the deposited As(0) which is non-conductive [53]. At low As concentrations longer deposition time permits to acquire better defined peaks.…”

Section: Repeatability Linearity Detection Limit and Accuracymentioning

confidence: 99%