Direct determination of trace quantities of lead, bismuth, selenium, tellurium, and thallium in high temperature alloys by nonflame atomic absorption spectrophotometry

A procedure for the simultaneous determination of tellurium and uranium is described. The procedure utilizes thermal neutron activation, followed by sample combustion and a gas phase separation of the volatile radionuclides of interest. This method is sensitive enough to permit the measurement of tellurium and uranium at their naturally occurring levels in materials of biological and environmental origin. The procedure has been successfully employed to determine the tellurium and uranium concentrations in three Standard Reference Materials (SRM's) currently being offered by the National Bureau of Standards, and in atmospheric particulate material collected in rural Maryland.

“…The tellurium results compare well with the only previously reported atmospheric measurement of <0.8 ng/m3 in College Park, Md. (19).…”

Section: Resultssupporting

confidence: 89%

“…Atomic absorption spectrometry has been utilized to determine tellurium, generally above the /xg/g concentration level (18,19), but again this technique does not have the sensitivity necessary to determine tellurium in most biological and environmental matricies without a pre-concentration step.…”

mentioning

confidence: 99%

Simultaneous determination of tellurium and uranium by neutron activation analysis

Gladney¹,

Rook²

1975

“…The analysis of this alloy for trace metals using atomic absorption, without resorting to time consuming extraction procedures (20), is difficult because of a large amount of spectral background interference. This interference is caused by scattering, by molecular absorption, and by atomic absorption of matrix elements (21,22). Using LEI, a determination of In in this sample was performed.…”

Section: Methodsmentioning

confidence: 99%

Laser enhanced ionization spectrometry in analytical flames

Turk¹,

Travis²,

DeVoe³

et al. 1979

103

A new variety of analytical atomic flame spectrometry called laser enhanced ionization (LEI) has been developed. The method relies on the enhanced rate of thermal ionization of the analyte element following photoexcitation with a dye laser tuned to an appropriate transition wavelength. This enhanced Ionization rate can be electrically measured directly in the flame, and therefore no optical detection system is required.Detection limits have been measured for 18 elements, showing

“…More complete wavelength tables (12)(13)(14) show that most analytically useful resonance lines fall quite close to numerous lines from many commonly encoutered elements. The presence of these lines must be taken into account when attempting trace AA analysis in complex matrices (6,15). CEWMAA is much less susceptible to this type of spectral interference since the very high resolution of the echelle monochromator eliminates all non-analyte absorbing lines from the spectral bandwidth, except those which result in direct absorption spectral overlap.…”

Section: Discussionmentioning

confidence: 99%

“…This critical pH adjustment requires some practice and is time consuming, but the fuming with H2S04 has the advantage of preventing premature hydrolysis of the actinides. Puphal and Olsen (15) prevented the hydrolysis of actinides before the electrodeposition by fuming the sample…”

mentioning

confidence: 99%

Correction for interferences of spectral origin with continuum source, echelle wavelength modulated atomic absorption spectrometry

Zander¹,

O’Haver²,

Keliher³

1977