Determination of arsenic in a nickel alloy by flow injection hydride generation atomic absorption spectrometry

Hanna, Christopher; Tyson, Julian F.; Offley, Stephen G.

doi:10.1016/0584-8547(92)80101-l

Cited by 12 publications

(2 citation statements)

References 24 publications

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“…A single-cycle univariate search procedure was used. Although, in general, this is not a valid procedure, previous studies [30][31][32] The parameters studied in relation to the digestion included the method of digestion and the temperature. A programmable block digestion unit, as described by D'Ulivo et al [26], was used to digest urine samples with the same sample size, reagents and heating times as described in the procedure above.…”

Section: Methods Developmentmentioning

confidence: 99%

Determination of Se in urine by flow injection hydride generation electrothermal atomic absorption spectrometry with in-atomizer trapping

Tyson¹,

Sundin²,

Hanna³

et al. 1997

Spectrochimica Acta Part B: Atomic Spectroscopy

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Following digestion of the sample in a mixture of bromate and hydrobromic acid, the inorganic selenium produced was quantified by trapping hydrogen selenide, formed when a 500 ml sample volume injected into a hydrochloric acid carrier stream merged with a stream of sodium borohydride solution, on the iridium-pretreated interior of a graphite furnace atomizer. A number of parameters relating to the digestion, flow injection manifold and trapping in the atomizer were investigated, including a study of factors affecting the detection limit. It was found necessary to heat the digest under reflux at a temperature of 150ЊC for 2 h. Quantitative recoveries, from a human urine matrix, of selenite, selenate, trimethylselenium, selenocystine, selenopurine and selenomethionine spikes were obtained. The efficiency of hydride generation, transport and trapping was 75%. The major factors affecting the detection limit were the reagent purity and the volume injected. For high-purity hydrobromic acid and borohydride free of caking agent, the detection limit, based on three times the standard deviation of the blank, was 0.06 mgl − 1 for a 1000 ml injection volume corresponding to a detection limit of 3 mgl − 1 for a urine sample. The method was validated by the accurate analyses of Standard Reference Material 2670 from the National Institute of Standards and Technology, and urine samples from an interlaboratory comparison program. The procedure avoids the need for perchloric acid and produces selenium in the + 4 oxidation state and thus no reduction is needed prior to generation of the hydrogen selenide. The use of a graphite furnace atomizer avoids the need for frequent reconditioning of the atomizer surface and the need for the standard additions method, both of which are drawbacks of procedures which make use of the quartz tube atomizer. All sample handling procedures following the digestion were automated by the use of flow injection technology.

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Section: Methods Developmentmentioning

confidence: 99%

Determination of Se in urine by flow injection hydride generation electrothermal atomic absorption spectrometry with in-atomizer trapping

Tyson¹,

Sundin²,

Hanna³

et al. 1997

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…A depressive interference upon the hydride signal is often encountered, however, because of the adsorp tion of the hydride on finely divided transition metal particles that may be precipitated by the reluctant [23,24]. Preliminary experiments had shown this to be the case for the determination of As in gold [25], despite the successful use of the kinetic discrimination with a FI system for the determination of As in nickel [26]. The Royal Canadian Mint (RCM) requires a method for the determination of As in the range 1-50 µg g-1 range in gold laser ablation standards.…”

mentioning

confidence: 99%

Determination of arsenic in gold by flow injection inductively coupled plasma mass spectrometry with matrix removal by reductive precipitation

Becotte-Haigh

Tyson

Denoyer

et al. 1996

Spectrochimica Acta Part B: Atomic Spectroscopy

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Arsenic was determined in gold by flow injection hydride generation inductively coupled plasma-mass spectrometry follow ing a batch mode reductive precipitation removal of the interfering gold matrix. A solution of potassium iodide, L-ascorbic acid, and hydrochloric acid was used as the reluctant. The recovery of gold by precipitation and filtration was 99 ± 3%. The detection limit for arsenic in gold was 55 ng g-1 in the solid. The concentration of arsenic that was determined in the Royal Canadian Mint gold sample FAU-10 was 29.7 µ.g g-1 in the solid; this value was indistinguishable, with 95% confidence, from values determined at the Royal Canadian Mint by graphite furnace atomic absorption spectrometry and by inductively coupled plasma-mass spectrometry. The standard deviation for four replicate determinations of the arsenic in FAU-10 was 0.972 µ.g g-1 in the solid.

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Nickel Ore and Metals Analysis

Johnston

2000

Encyclopedia of Analytical Chemistry

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This article examines contemporary routine and umpire quality methods for the analysis of nickel ores, nickel metal and nickel alloys. Sample preparation and sampling are also discussed, but the emphasis is on sample preparation and analysis, since sampling is all too often done by people not part of the analytical laboratory. In order to analyze fully these materials, a laboratory must have at its disposal a wide range of instruments and methods, from the classical to the most modern, and frequently combinations of both. In keeping with the theme of this Encyclopedia, detailed methods are not given, and the reader should consult the references. The references themselves cover the period from roughly 1972 through 1997 but are not to be considered a definitive list. Unfortunately, most of the modern methods of analysis developed by chemists in nickel producers' laboratories have not been published, except as international or national standards. As an aid to the reader, a summary of International Organization for Standardization (ISO) and national standards is given immediately before the References. The author apologizes for any errors or omissions. The section on nickel ores is divided into two broad classifications: sulfide and lateritic ores. Greater emphasis is given to the sample preparation of laterites since they are more difficult to handle and many laboratories do not have as much experience working with them as with sulfides. Each broad classification is broken down into the analysis of “pay metals”, which are the reason the ore is mined, elements of environmental concern and other elements which are required for the metallurgical processing of the ore. Products from refineries fall into three broad categories: nickel metal in various forms, nickel oxides and ferronickel. For nickel metal, the emphasis is on trace‐element determinations; for nickel oxides and ferronickel, methods for the determination of nickel are also discussed. Nickel alloys cover a wide range of materials, from stainless steels to high‐nickel “superalloys”. For these samples the analytical requirements range from the major components of the alloy to minor alloying constituents to trace‐element determinations. As an aid to the analytical chemist in the laboratory, tables are presented summarizing recommended methods of analysis, and in most instances an alternative method, in case the laboratory does not have the equipment necessary to select the first choice. These methods have proven themselves in the laboratories of nickel producers and commercial laboratories familiar with the analysis of nickel‐bearing samples.

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Determination of arsenic in a nickel alloy by flow injection hydride generation atomic absorption spectrometry

Cited by 12 publications

References 24 publications

Determination of Se in urine by flow injection hydride generation electrothermal atomic absorption spectrometry with in-atomizer trapping

Determination of Se in urine by flow injection hydride generation electrothermal atomic absorption spectrometry with in-atomizer trapping

Determination of arsenic in gold by flow injection inductively coupled plasma mass spectrometry with matrix removal by reductive precipitation

Nickel Ore and Metals Analysis

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