Determination of inorganic arsenic species by flow injection hydride generation atomic absorption spectrometry with variable sodium tetrahydroborate concentrations

Sigrist, Mirna; Beldoménico, Horacio

doi:10.1016/j.sab.2004.04.003

Cited by 45 publications

(29 citation statements)

References 22 publications

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“…As shown in Fig. 3a, the emission signal rapidly increased when the HCl concentration was increased up to 2 mol/l, reaching maximum and constant value at concentrations above 3 and 4 mol/l, similar to previous reports 7,16 . The optimum concentration of HCl chosen was 2 mol/l because of the lowest %RSD.…”

Section: Hcl Concentrationsupporting

confidence: 90%

Determination of inorganic arsenic species by hydride generation–inductively coupled plasma optical emission spectrometry

Chooto¹,

Muakthong²,

Innuphat³

et al. 2016

ScienceAsia

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ABSTRACT:A hydride generation-inductively coupled plasma optical emission spectrometry (ICP-OES) technique was developed to determine inorganic As, including total As, As(III), and As(V), in drinking water samples in optimized conditions as follows: wavelength of 193.7 nm, integration time of 5-10 s, RF power of 1.3 kW, and the flow rates of plasma gas and auxiliary gas of 15 and 0.2 l/min for ICP-OES, the sample flow rates of 1.2 ml/min, reductant, and acid 0.4 ml/min and carrier gas 0.3 l/min, 0.4% (w/v) NaBH 4 with 40% (w/v) KI within 10 min as a reductant for total As, 0.4% (w/v) NaBH 4 for As(III) and 2 mol/l HCl for hydride generation. As(V) was obtained from the difference between total As and As(III). The linear dynamic range was 1-100 µg/l with a correlation coefficient of 0.9998. The limit of detection of total As, As(III), and As(V) was 0.38, 0.07, and 0.37 µg/l, respectively. The limit of quantification of total As, As(III), and As(V) was 1.28, 0.24, and 1.17 µg/l, respectively. 94.9-99.1% recovery for each As species was achieved. This fast and easy method was applied to determine arsenic in drinking water samples with satisfactory recovery (79-112%).

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Section: Hcl Concentrationsupporting

confidence: 90%

Determination of inorganic arsenic species by hydride generation–inductively coupled plasma optical emission spectrometry

Chooto¹,

Muakthong²,

Innuphat³

et al. 2016

ScienceAsia

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“…However, agrochemicals containing high levels of NO 3 and PO 4 in waters have been shown to enhance/suppress MA V levels from the SPE methodology utilised in this study by as much as 13 -21 % (Watts et al [THIS ISSUE]). Previous studies on the levels of arsenic in waters have mainly reported only inorganic species (As III and As V ), in which As V was deduced from the subtraction of As III from the total arsenic level (Sigrist and Beldoménico 2004;Edwards et al 1998). This subtraction method does not account for organoarsenicals and may provide apparently elevated concentrations for As V .…”

Section: Discussionmentioning

confidence: 99%

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

O'Reilly

Watts

Shaw

et al. 2010

Environ Geochem Health

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Arsenic (As) speciation in surface and groundwater from two provinces in Argentina (San Juan and La Pampa) was investigated using solid phase extraction (SPE) cartridge methodology with comparison to total arsenic concentrations. A third province, Río Negro, was used as a control to the study. Strong cation exchange (SCX) and strong anion exchange (SAX) cartridges were utilised in series for the separation and preservation of arsenite (As ). Samples were collected from a range of water outlets (rivers/streams, wells, untreated domestic taps, well water treatment works) to assess the relationship between total arsenic and arsenic species, water type and water parameters (pH, conductivity and total dissolved solids, TDS). Analysis of the waters for arsenic (total and species) was performed by inductively coupled plasma mass spectrometry (ICP-MS) in collision cell mode. Total arsenic concentrations in the surface and groundwater from Encon and the San José de Jáchal region of San Juan (north-west Argentina within the Cuyo region) ranged from 9 -357 μg l -1As. Groundwater from Eduardo Castex (EC) and Ingeniero Luiggi (LU) in La Pampa (central Argentina within the Chaco-Pampean Plain) ranged from 3 -1326 μg l -1As. The pH range for the provinces of San Juan (7.2 -9.7) and La Pampa (7.0 -9.9) are in agreement with other published literature. The highest total arsenic concentrations were found in La Pampa well waters (both rural farms and pre-treated urban sources), particularly where there was high pH (typically > 8.2), conductivity (> 2600 μS cm As. Arsenic species for both provinces were predominantly As for groundwater, respectively. This translates to a relative As III abundance of 69 -100 % of the total arsenic in surface waters and 32 -100 % in groundwater. This is unexpected because it is typically thought that in oxidising conditions (surface waters), the dominant arsenic species is As V . However, data from the SPE methodology suggests that As III is the prevalent species in San Juan, indicating a greater influence from reductive processes. La Pampa groundwater had As (equating to up to 33 % of the total arsenic). Previously published literature has focused primarily on the inorganic arsenic species, however this study highlights the potentially significant concentrations of organoarsenicals present in natural waters. The potential for separating and preserving individual arsenic species in the field to avoid transformation during transport to the laboratory, enabling an accurate assessment of in-situ arsenic speciation in water supplies is discussed.

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“…Originally pre-reductant of iAs(V), potassium iodide, usually in combination with ascorbic acid [16][17][18][19] or with very concentrated HCl [20], was commonly used. Due to low stability and neccessity of high concentration of KI and HCl for reaching complete pre-reduction, agents with -SH group, namely L-cysteine (L-cys) are more popular nowadays [13,16,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

On-line pre-reduction of pentavalent arsenicals by thioglycolic acid for speciation analysis by selective hydride generation–cryotrapping–atomic absorption spectrometry

Musil

Matoušek

2008

Spectrochimica Acta Part B: Atomic Spectroscopy

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An improvement of current method of selective hydride generation based on pre-reduction for differentiation of tri-and pentavalent arsenicals is described, applied for the oxidation state specific speciation analysis of inorganic, mono-, di-and trimethylated arsenicals with minimum sample pretreatment using atomic absorption spectrometry with the multiatomizer. The preconcentration and separation of arsine, methylarsine, dimethylarsine and trimethylarsine is then carried out by means of cryotrapping. Presented study shows that 2% (m/v) L-cysteine hydrochloride monohydrate (L-cys) currently used for off-line pre-reduction of pentavalent arsenicals can be substituted with 1% (m/v) thioglycolic acid (TGA). Much faster pre-reduction of pentavalent arsenicals at 25°C with equal sensitivities as in the case of L-cys has been achieved with TGA. A setup for on-line prereduction by TGA has been optimized, with the application of segmented flow analysis for suppression of axial dispersion in the pre-reduction coil. Standard calibrations measured with or without on-line pre-reduction indicate uniform and equal sensitivities for all As forms. The possibility of standardization by water standards of single species (e.g. iAs(III)) for quantification of all other As forms in urine is demonstrated in the recovery study. Limits of detection were 100 ng·l −1 for iAs (III), 135 ng·l −1 for iAs(V) and 30 to 50 ng·l −1 for methylated arsenicals.

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Determination of inorganic arsenic species by flow injection hydride generation atomic absorption spectrometry with variable sodium tetrahydroborate concentrations

Cited by 45 publications

References 22 publications

Determination of inorganic arsenic species by hydride generation–inductively coupled plasma optical emission spectrometry

Determination of inorganic arsenic species by hydride generation–inductively coupled plasma optical emission spectrometry

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

On-line pre-reduction of pentavalent arsenicals by thioglycolic acid for speciation analysis by selective hydride generation–cryotrapping–atomic absorption spectrometry

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