Difficulties in the determination of arsenic by atomic absorption spectrometry

Robinson, James W.; Garcia, Rui Jesus Lorenzo; Hindman, G.D.; Slevin, P. J.

doi:10.1016/0003-2670(74)80025-5

Cited by 24 publications

(6 citation statements)

References 6 publications

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“…Several investigators have studied arsenic loss during low-temperature ashing (2,3). Molecular absorption is known to present a major problem in arsenic determinations.…”

mentioning

confidence: 99%

Sampling and atomic absorption spectrometric determination of arsine at the 2 .mu.g/m3 level

Denyszyn¹,

Grohse²,

Wagoner³

1978

Anal. Chem.

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A method has been developed and refined for the sampling and analytical measurement of arsine at the 2 µ / 3 level with a collection period of 15 min. Arsine standard samples were collected on charcoal, recovered by acid desorption, and analyzed by a combined chemical modification-flameless atomic absorption technique utilizing a heated graphite atomizer (HGA). Mean percent recovery and relative standard deviation were 89.1 % and ±0.10, respectively, for 105 samples over the sampling and analysis procedure. The chemical modification prevents sample loss during analysis and results In Improvements In sensitivity and linearity over previously employed methods. A calibration system employing a twofold dilution was fabricated to generate arsine standard samples In the 1 to 10 pg/m3 range.

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“…Several investigators have studied arsenic loss during low-temperature ashing (2,3). Molecular absorption is known to present a major problem in arsenic determinations.…”

mentioning

confidence: 99%

Sampling and atomic absorption spectrometric determination of arsine at the 2 .mu.g/m3 level

Denyszyn¹,

Grohse²,

Wagoner³

1978

Anal. Chem.

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“…Scheme II is a special situation derived from Scheme I bons at temperatures much below the temperatures necessary to volatilize the metal itself. Moreover, a number of elements volatilize at temperatures below which they are atomized (e.g., H2, CU, P4, 2, As2) (30). As a result of these facts, there is always the danger of premature decomposition of the analyte in an unfavorable thermal regime within the furnace resulting in inefficient atomization (poor sensitivity), loss of sample to the furnace (background buildup, unfavorable detection limit), and irreproducibility of the complex set of equilibria shown in Scheme I (poor precision).…”

Section: Resultsmentioning

confidence: 99%

Chemical and physical considerations in the use of atomic absorption detectors coupled with a gas chromatograph for determination of trace organometallic gases

Parris¹,

Blair²,

Brinckman³

1977

Anal. Chem.

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“…Similar externally heated quartz tube atomizers were reported by various authors. [146][147][148][149] An internal flame, or flame-in tube (FIT), which utilized the hydrogen-oxygen, was introduced by Simer and Hageman. 150 It does not need to be heated.…”

Section: Atomization Of Volatile Hydrides In the Quartz Cellmentioning

confidence: 99%

Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

Kumar

Riyazuddin

2005

ANAL. SCI.

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The mechanism of volatile hydride generation (HG) and the formation of analyte atoms in the quartz cell atomizer used in the determination of hydride-forming elements (As, Bi, Ge, Pb, Sb, Sn, Te etc.) by atomic absorption spectrometry (AAS), have been critically reviewed. The nascent hydrogen mechanism failed to explain hydride generation under different experimental conditions when tetrahydroborate (THB), amineboreanes (AB) and cyanotrihydroborate (CBH) were used as reductants. Various experimental evidence suggested a non-nascent hydrogen mechanism, in which the transfer of hydrogen directly bonded to boron to an analyte takes place. In electrochemical hydride generation (EcHG), the reduction of the analyte species and subsequent hydrogenation was proposed. The mechanism of analyte atom formation in a quartz tube atomizer has been explained by the following hypotheses: thermal decomposition, oxidation by 02 and collisions by hydrogen free radicals. The free-radical mechanism satisfactorily explains most of the analytical implications. The significant variation in the experimental conditions required to generate different analyte hydrides makes it difficult to arrive at a generalized mechanism of hydride formation.

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Difficulties in the determination of arsenic by atomic absorption spectrometry

Cited by 24 publications

References 6 publications

Sampling and atomic absorption spectrometric determination of arsine at the 2 .mu.g/m3 level

Sampling and atomic absorption spectrometric determination of arsine at the 2 .mu.g/m3 level

Chemical and physical considerations in the use of atomic absorption detectors coupled with a gas chromatograph for determination of trace organometallic gases

Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

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