Analytical Tools for Monitoring Arsenic in the Environment

Luong, John H. T.; Majid, Ehteshami; Male, Keith B.

doi:10.2174/1874065000701010007

Cited by 59 publications

(37 citation statements)

References 9 publications

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“…Electrochemical determination of total arsenic as well as arsenic(III) involves very often a first step of reduction for all the pentavalent forms into the trivalent form. Many reduction procedures have been described in the literature using KI or KI/ascorbic acid, 18, 38, 42, 43, SO 3 2− , 10, 18, 26, 36 S 2 O 3 2− , cysteine or hydrazine 18, 19. Different procedures were tested in this work and the most satisfactory results were obtained by the combined use of KI and ascorbic acid (see experimental section).…”

Section: Resultsmentioning

confidence: 99%

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Determination of Arsenic(III) at a Nanogold Modified Solid Carbon Paste Electrode

et al. 2014

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A selective and sensitive electroanalytical method was developed for arsenic determination based on a nanogold (AuNP) modified solid carbon paste working electrode (SCPE) modified in two steps (i) physisorption and (ii) additional electrodeposition of nanogold particles in the presence of iodide. Copper(II) interference was solved by covering the gold layer by a self assembled mono layer (SAM) of glutathione. Using DPASV a linear response of the signal was obtained as a function of As(III) in the concentration range 0.05–20 µM (4–1498 ppb) with a limit of detection of 0.01 µM (0.9 ppb). Sample stirring and degassing were not needed. Application to the determination of arsenic(III) and (V) in underground water samples from Burkina Faso was successfully achieved.

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Section: Resultsmentioning

confidence: 99%

“…This sample was placed in an oven at 95 °C during 45 min. The sample pretreatment allowed the reduction of arsenic (V) and permitted total arsenic determination as well as arsenic(III) species 38.…”

Section: Methodsmentioning

confidence: 99%

Determination of Arsenic(III) at a Nanogold Modified Solid Carbon Paste Electrode

et al. 2014

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“…Besides its direct toxicity, the mutagenic and carcinogenic potential of arsenic upon prolonged exposure is also reported (Hughes, 2011). Out of its four existing valence states, As(III) and As(V) are the most widespread forms in nature, with As(III) being the dominant one (Luong, 2007). The current World Health Organization limit for maximum arsenic concentration in drinking water is 10 μg/l for the developed countries (WHO, 2011).…”

Section: Introductionmentioning

confidence: 99%

A colorimetry based, semi-automated portable sensor device for the detection of arsenic in drinking water

Bonyár

Nagy

Mayer

et al. 2017

Sensors and Actuators B: Chemical

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A portable colorimetric device is presented for arsenic ion detection in drinking water. The main purpose of this device -which was developed to complement a commercial water dearsenating station demanding regular (weekly to monthly) regeneration runs depending on its saturation -is to provide regular field measurements and easy, semi-automatic operation designed specifically for untrained, typically illiterate users e.g. the population of developing countries. The device exploits a commercially available, well established reagent kit, which is widely used in arsenic field-testing in many developing countries. The hereby presented custom-designed microfluidic system enhances the user-friendliness, the functionality and reliability of the test-strip based kit. The response for total inorganic arsenic ion concentrations (As(III) and As(V)) is linear in the 5-20 μg/l (ppb) range with a sensitivity of 1 μg/l, thus the device is capable to distinguish drinkable water based on the World Health Organization (WHO) guidelines of 10 μg/l. The average relative standard deviation of the measurements is 8 % in the linear range and it is below 2 % for higher arsenic concentrations (above 20 μg/l). The hardware construction of the device and the custom microfluidic system is presented in detail. The effect of elevated water sample temperature on the kinetics and performance of the device was also investigated in order to reduce the required time for the measurements. Stable and reliable arsenic concentration values were obtained after 60 min at 22 o C (ambient temperature) and after only 25 min at 50 o C water sample temperature, but at a cost of an increased relative standard deviation to 16 %, in the linear range.

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“…These techniques provide low-cost, rapid and portable options for in-field routines 9 . Specifically, stripping analysis is advantageous for trace determination in real samples because the substance of interest can be preconcentrated on the working electrode.…”

Section: Introductionmentioning

confidence: 99%

Flow injection–differential pulse anodic stripping voltammetry to measure As(III) and As(V) in natural water samples

Duangthong¹,

Suwanin²,

Chooto³

et al. 2016

ScienceAsia

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Flow injection-differential pulse anodic stripping voltammetry (FI-DPASV) for As(III) and As(V) determination at parts-per-billion (ppb) level was developed with gold film coated glassy carbon as a working electrode. As(III) was determined first by FI-DPASV. Then, As(total) was determined by reducing As(V) to As(III) using 6.5 mM KI for 45 min, and As(V) was quantified as the difference. Parameters for the pre-plated gold film electrode in As(III) and As(V) determination were optimized to obtain linear calibration graphs in the range of 1.0-30 µg/l and 2.0-100 µg/l for As(III) and As(total), respectively. The limits of detection (based on 3 S y/x /m) of 0.81 µg/l As(III) and 2.03 µg/l As(total) were obtained with a precision within 4% (at 2 and 20 µg/l, n = 10) for As(III) and within 6% (at 10 and 100 µg/l, n = 10) for As(total). Analysis of the Standard Reference Material 1640 natural water standard with the certified value of 26.67 ± 0.41 µg/l yielded total arsenic concentration of 25.2 ± 0.7 µg/l (n = 3). For cations commonly found in natural water, Sb(III) was found to interfere with As(III) analysis whereas Hg(II) and Cu(II) interfere with As(total) determination. The developed method was successfully applied to natural water samples collected from arsenic contaminated areas in Ron Phibun Subdistrict, Ron Phibun District, Nakhon Si Thammarat Province in Thailand. The recoveries of the method by spiking were in the range of 85-105%. The results of As(total) in natural water samples analysed by the developed method (FI-DPASV) were in good agreement with those obtained by inductively coupled plasma-optical emission spectrometry.

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Analytical Tools for Monitoring Arsenic in the Environment

Cited by 59 publications

References 9 publications

Determination of Arsenic(III) at a Nanogold Modified Solid Carbon Paste Electrode

Determination of Arsenic(III) at a Nanogold Modified Solid Carbon Paste Electrode

A colorimetry based, semi-automated portable sensor device for the detection of arsenic in drinking water

Flow injection–differential pulse anodic stripping voltammetry to measure As(III) and As(V) in natural water samples

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