Absolute analysis by flame atomic absorption spectroscopy: Present status and some problems

An experimental procedure Is described which allows the direct, time-resolved investigation of the spatial distribution of analyte atoms surrounding an individual solute particle vaporizing In a laminar flame. In the procedure, the Individual atomic clouds are observed spectrometrlcally as the flame sweeps them past a fixed horizontal viewing region. The spatial Intensity profiles so obtained are treated by a spherically symmetric Abel-type series, to provide the radial analyte distribution In each cloud. These measured radial distributions

Section: Discussionmentioning

confidence: 99%

Experimental studies on spatial distributions of atoms surrounding an individual solute particle vaporizing in an analytical flame

Boss¹,

Hieftje²

1979

“…In a second approach, peak current variations with pH, organic chelate content or carbonate alkalinity are observed and related to the formation or dissolution of nonreducible complexes, solid phases, or colloidal species (1,(5)(6)(7)(8)(9). In yet another approach, ASV is used to measure reducible metal during a complexometric titration.…”

Section: Discussionmentioning

confidence: 99%

“…The vaporization process has been alluded to by a number of workers (4)(5)(6)(7)(8)(9) and suitable mathematical models exist for determining rates of vaporization under somewhat restrained conditions (10)(11)(12). These models incorporate the significance of particle size in their computation as well as the expected dependence on such parameters as flame temperature and partial pressures of the vapor components at the stated temperature.…”

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confidence: 99%

“…A conventional premix C2H2/air flame supported on a slot burner was oriented perpendicular to the optical path and height-dependent absorbance measurements were made using a modified optical system of a double beam spectrophotometer which permitted a spacial resolution of 0.2 mm. The use of integrated absorbance has been discussed previously (7,12) and was employed to measure more accurately the height dependence on the degree of atomization under various experimental conditions.…”

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confidence: 99%

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Vaporization and atomization of large particles in an acetylene/air flame

Holcombe¹,

Eklund²,

Grice³

1978

“…Matrix interferences for atomic absorption analyses using electrothermal vaporization atomizers (ETAAS) have been extensively studied (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). While such interferences are derived from chemical or physical interactions between the sample matrix and the analyte, rigorous characterization of the actual controlling phenomena has remained difficult (9).…”

mentioning

confidence: 99%

Mechanistic characterization of chloride interferences in electrothermal atomization systems

Shekiro¹,

Skogerboe²,

Taylor³

1988

A computer-controlled spectrometer with a photodiode array detector has been used for wavelength and temperature resolved characterization of the vapor produced by an electrothermal atomizer. The system has been used to study the chloride matrix Interference on the atomic absorption spectrometrlc determination of manganese and copper. The suppression of manganese and copper atom populations by matrix chlorides such as those of calcium and magnesium Is due to the gas-phase formation of an analyte chloride species followed by the diffusion of significant fractions of these species from the atom cell prior to completion of the atomization process. The analyte chloride species cannot be formed when matrix chlorides with metal-chloride bond dissociation energies above those of the analyte chlorides are the principal entitles present. The results Indicate that multiple wavelength spectrometry used to obtain temperature-resolved spectra Is a viable tool In the mechanistic characterization of Interference effects observed with electrothermal atomization systems.