Inorganic interference study of automated arsenic and selenium determination with atomic absorption spectrometry

Pierce, F. D.; Brown, Hugh R.

doi:10.1021/ac60368a019

Cited by 151 publications

(47 citation statements)

References 2 publications

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“…This might be due to the formation of arsenic chloride that is volatilized in the pyrolysis stage. 23) There are some challenges when it comes to the determination of elements below 0.01 w-% level using the electrolytic extraction method combined with elemental analysis using GFAAS and FAAS. The sample dissolution in the 10% acetylacetone electrolyte is slower than in the 10% HCl electrolyte.…”

Section: Discussionmentioning

confidence: 99%

Determination of Alloying and Impurity Elements from Matrix and Inclusions from a Process Sample of a Double Stabilized Stainless Steel

et al. 2016

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The determination of alloying and impurity elements was performed from a stainless steel matrix and inclusions in process samples. An electrolytic extraction method was applied for the separation of inclusions using two different but commonly used electrolytes, 10% HCl and 10% acetylacetone in methanol. The elemental analyses were performed using atomic absorption spectrometry. The elements of interest were aluminum, arsenic, copper, vanadium, titanium and chromium. The aluminum containing inclusions were imaged using a field emission scanning electron microscope. The results for copper and chromium in both electrolytes, vanadium in 10% HCl electrolyte and arsenic in 10% acetylacetone electrolyte were in good agreement with industrial data. Titanium and aluminum were measured from the dissolved steel matrix but titanium was also detected in the inclusions. It was concluded that the analytical results for titanium and aluminum measured using an optical emission spectrometer is affected by the inclusions within the stainless steel.

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Section: Discussionmentioning

confidence: 99%

Determination of Alloying and Impurity Elements from Matrix and Inclusions from a Process Sample of a Double Stabilized Stainless Steel

et al. 2016

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“…In the present system, the sample stream is merged first with hydrochloric acid and then with tetrahydroborate, whereas the opposite order was used by Riby et al 15 A comprehensive study of the effect, on both cation and anion interferences in the determination of arsenic and selenium, of the order of addition of tetrahy droborate and acid for a continuous-flow hydride genera tion system was made by Pierce and Brown. 27 They reported a substantial decrease in the extent of interferences when the acid was added before the tetrahydroborate but indicated that this order of addition of reagents gave a poorer precision. However, on applying a two-sided F-test {P=0.05) to the results presented by them, 27 the null hypothesis (that there is no significant difference between precisions) is retained.…”

mentioning

confidence: 99%

“…27 They reported a substantial decrease in the extent of interferences when the acid was added before the tetrahydroborate but indicated that this order of addition of reagents gave a poorer precision. However, on applying a two-sided F-test {P=0.05) to the results presented by them, 27 the null hypothesis (that there is no significant difference between precisions) is retained. In a study of the continuous-fl ow determination of antimony and arsenic, Crock and Lichte 28 confirmed the effect of the order of addition of reagents on the extent of interference by cations.…”

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confidence: 99%

Determination of arsenic in a nickel-based alloy by flow injection hydride generation atomic absorption spectrometry incorporating continuous-flow matrix isolation and stopped-flow pre-reduction procedures

Tyson¹,

Offley²,

Seare³

et al. 1992

J. Anal. At. Spectrom.

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A flow system incorporating a microcolumn of strongly acidic cation-exchange resin (Dowex 50W), to achieve continuous-flow matrix isolation, was used to eliminate nickel interference in the determination of arsenic in a nickel-based alloy by flow injection hydride generation atomic absorption spectrometry. A stopped-flow iodide pre-reduction procedure within the matrix isolation unit converted all arsenic present in the sample into As111 prior to determination with a tube-in-flame atomizer. The flow injection valve interface between the matrix isolation and hydride generation manifolds allowed separate optimization of each chemistry. After removal of the nickel, the sample stream, flowing at 2.2 ml min-I, was merged first with a stream of 12 mol dm+ hydrochloric acid flowing at 2.2 ml min-l and then with a stream of potassium iodide solution (30% m/v) flowing at 1.4 ml min-l.For stop times between 5 and 30 s, an average recovery of 97% with respect to AsiE1 was obtained. A 400 pl volume of solution was then injected into a water carrier stream (flowing at 11.0 ml min-I), merged with 3.6 mol dm-3 hydrochloric acid flowing at 3.2 ml min-I and a stream of 1 .O% m/v sodium tetrahydroborate solution. After passage through a 600 mm open-tubular reactor argon was merged at 400 dm3 min-l and the arsine separated in a glass U-tube separator. A 0.2 pm polytetrafluoroethylene membrane filter in the gas transfer line removed aerosol droplets with consequent improvement in the performance of the tube atomizer. The procedure was successfully applied to the determination of arsenic in a nickel-based alloy reference material (BCS-346) containing 50 pg g-' of arsenic for which a sealed-vessel microwave digestion procedure, involving nitric and hydrofluoric acids, was found to produce arsenic in the +5 oxidation state. A characteristic concentration of 2.0 ng ml-' of arsenic and a limit of detection of 3.9 ng ml-l of arsenic were obtained with the pre-reduction procedure (which diluted the samples by a factor of 2.7) for a set of operating parameters optimized with respect to interference tolerance and throughput in addition to sensitivity. Under these conditions a sample throughput of 54 h-l was obtained.

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“…[2][3][4] Several ways proposed to overcome the interferences may be broadly classified into two groups (1) separation of the interfering elements from sample and (2) complex formation of the elements with masking agents in solution.…”

mentioning

confidence: 99%

Determination of Trace Arsenic and Selenium in Copper and Nickel Powders by Hydride-Generation Atomic Absorption Spectrometry after Chelex Separation

Narasaki

1986

ANAL. SCI.

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Inorganic interference study of automated arsenic and selenium determination with atomic absorption spectrometry

Cited by 151 publications

References 2 publications

Determination of Alloying and Impurity Elements from Matrix and Inclusions from a Process Sample of a Double Stabilized Stainless Steel

Determination of Alloying and Impurity Elements from Matrix and Inclusions from a Process Sample of a Double Stabilized Stainless Steel

Determination of arsenic in a nickel-based alloy by flow injection hydride generation atomic absorption spectrometry incorporating continuous-flow matrix isolation and stopped-flow pre-reduction procedures

Determination of Trace Arsenic and Selenium in Copper and Nickel Powders by Hydride-Generation Atomic Absorption Spectrometry after Chelex Separation

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