Ein verbundverfahren zur bestimmung von beryllium in biologischen matrices durch flammenlose atomabsorptionsspektrometrie

Stiefel, Th.; Schulze, K.; Tölg, G.; Zorn, H.

doi:10.1016/s0003-2670(01)83121-4

Cited by 41 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Treatment of Graphite Atomizer Tubes. By using reduced pressure, the penetration of the soaking solution inside the graphite tube is fast and the whole operation takes only a few minutes or so as compared to 24 h at atmospheric pressure (10) or 6 h at 175 °C in an autoclave (11). After one treatment, electron microprobe analysis of the cross section of the tube showed a uniform tantalum penetration through the whole wall thickness.…”

Section: Resultsmentioning

confidence: 99%

Tantalum treated graphite atomizer tubes for atomic absorption spectrometry

Zatka¹

1978

Anal. Chem.

103

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Tantalum treated graphite atomizer tubes for atomic absorption spectrometry

Zatka¹

1978

Anal. Chem.

103

View full text Add to dashboard Cite

“…U se of G C requires that beryllium is converted to a volatile form such as a tri uoroacetylacetone which appears to have been the most popular derivative (Taylor and Arnold 1971, Kaiser et al 1972, F ishbein 1984, ATSDR 1993. D etection limits of 0.01 mg/kg of sample can be reached by this technique which, however, requires adequately trained and skilled personnel (Stiefel et al 1976). A number of other analytical techniques such as enzyme-catalyzed chemiluminescence (K amtekar et al 1996), chelate reversed phase high performance liquid chromatography (Shoupu et al 1994), gamma activation and polarography (WHO 1990, IAR C 1993 have only limited application.…”

Section: Analytical Procedures For Drinking Water and Foodmentioning

confidence: 99%

Beryllium in food and drinking water - a summary of available knowledge

Vaessen¹,

Szteke²

2000

Food Additives and Contaminants

View full text Add to dashboard Cite

In an overall evaluation of the situation published by IARC in 1993, beryllium and beryllium compounds are identified as carcinogens to humans. This prompted the initiation of this study on beryllium which reviews the situation up to 1998 on the aspects: properties and applications, toxicity, analytical procedures for food and drinking water, reference materials, occurrence in food and drinking water and estimates of daily dietary exposure. Special emphasis is put on analytical aspects and levels of beryllium in food and drinking water.

show abstract

“…Since silane is toxic and spontaneously flammable in air, a rapid and sensitive monitoring is desired. However, there have been only a few monitoring instruments or sensors developed so far, i.e., a chemiluminescence detector with ozone oxidation, a galvanic cell with a gas-permeable membrane, and an indirect atomic absorption spectrometer utilizing reduction of mercury oxide with silane followed by the mercury determination (1). Moreover, these methods do not necessarily satisfy the requirements for a monitor such as high sensitivity, rapid response, and simple operation.…”

Section: Literature Citedmentioning

confidence: 99%

Comparison of furnace atomization behavior of aluminum from standard and thorium-treated L'vov platforms

Brueggemeyer¹,

Fricke²

1986

Anal. Chem.

View full text Add to dashboard Cite

A standard pyrolytlc graphite L'vov platform was compared to one treated by soaking In a 10% thorlum nitrate solution.The half-wldhs d fwnace atomk absorptbn peak profiles for Ai were reduced by as much as a factor of 4 by the modlfled surlace, and the maxlmum pennWble drarrlng temperature was extended by more than 800 O C . The peak area preckh (1.5% relative standard devlatbn for 200 pg of AI) and sen-sltivHy were comparable to those obtained with untreated platforms. Thls behavlor was stlli observed afler 500 flrlngs of a treated platform at 2450 O C .Improvements in trace-metal analyses using graphite furnace atomic absorption spectrometry (GFAAS) have been hindered by the lack of fundamental knowledge concerning the high-temperature chemistry taking place in the furnace itself. Due to this uncertainty many analysts have resorted to an empirical approach in their attempts to modify the behavior of analyte in the furnace. Such research necessarily has a trial-and-error appearance-various reagents and conditions examined until success is reached. This has been particularly true in the area of graphite atomizer surface modification.The treatment of graphite with various metals or solutions of their salts has produced new surfaces exhibiting properties markedly different than those of the original graphite. The chief pattern that has emerged is the fact that most metals used to modify graphite are known to form metal carbides.It is not known whether the carbide-forming metals not reported in the literature as surface modifiers have yet to be tried or have been found ineffective.The most commonly reported advantage of a metal-treated surface is an increase in analyte sensitivity (1-8). It should be pointed out that in some instances various authors explicitly mentioned that peak heights were used in preference to integrated peak areas or did not mention which mode of quantification was used. It is possible in some of these cases that the reported sensitivity improvement for peak heights was in fact a peak sharpening, leaving integrated area un-changed. Theory (9) predicts that integrated peak area is the better indicator of the extent of free atom formaton. It should also be pointed out that most of the reported sensitivity enhancements were in comparison to nonpyrolytic graphite tubes, which have now been largely supplanted by pyrolytically coated graphite. In some instances the advantages indicated might not have been realized over the newer graphite.The benefits of metal-modified graphite surfaces have extended beyond signal enhancement. It was reported by Norval et al. (10) that a tungsten-or tantalum-treated surface resulting from sputtering of the metal led to an improved resistance of the graphite surface toward oxidizing acids. A similar result was found by Sotera et al. (11) for a borontreated surface. Vickrey et al. found that a zirconium carbide surface allowed organolead (12) and organotin (13) compounds to be determined by using aqueous standards in the furnace while this could not be accomplished on ...

show abstract

Ein verbundverfahren zur bestimmung von beryllium in biologischen matrices durch flammenlose atomabsorptionsspektrometrie

Cited by 41 publications

References 14 publications

Tantalum treated graphite atomizer tubes for atomic absorption spectrometry

Tantalum treated graphite atomizer tubes for atomic absorption spectrometry

Beryllium in food and drinking water - a summary of available knowledge

Comparison of furnace atomization behavior of aluminum from standard and thorium-treated L'vov platforms

Contact Info

Product

Resources

About