A critical evaluation of the graphite furnace conditions for the direct determination of chromium in urine

1999 ◽  
Vol 364 (4) ◽  
pp. 333-337 ◽  
Author(s):  
S. P. Quináia ◽  
J. A. Nóbrega
Keyword(s):  
Graphite Furnace ◽  
Critical Evaluation ◽  
Direct Determination ◽  
Chromium In Urine

Atomic Absorption Determination of Lead, Bismuth, Selenium, Tellurium, Thallium and Tin in Complex Alloys Using Direct Atomization from Metal Chips in the Graphite Furnace

1977 ◽  
Vol 31 (1) ◽  
pp. 9-11 ◽  
Author(s):  
J. Y. Marks ◽  
G. G. Welcher ◽  
R. J. Spellman
Keyword(s):  
Trace Elements ◽  
Atomic Absorption ◽  
Base Alloy ◽  
Cast Alloy ◽  
Graphite Furnace ◽  
Direct Determination ◽  
Nickel Base Alloy ◽  
Metal Chips ◽  
Nickel Base

Atomic absorption spectrometry utilizing electrothermal atomization devices has proven to be the best technique available for the analysis of complex alloys for trace elements of metallurgical interest. The determination of lead, bismuth, selenium, tellurium, thallium, and tin was successfully demonstrated by direct atomization from complex, nickel-base alloy chips with commercial atomic absorption furnace equipment. The determination was carried out by first milling metal chips from the bulk sample. The sample was transferred directly to the furnace and atomized immediately with no preatomization heating cycle. A series of cast alloy standards containing the trace elements were prepared by additions to a nickel-base alloy, then subsequently analyzed by established analytical methods. Of the three commercial atomizers studied, the Perkin-Elmer model HGA 2100 proved to be the most suitable for direct determination of the trace elements of interest. The coefficient of variation of absorbance measurements varied from 7% for bismuth which is easily atomized to 25% for tin which is more difficult to atomize.

Direct determination of selenium in serum by graphite-furnace atomic absorption spectrometry with deuterium background correction and a reduced palladium modifier: age-specific reference ranges.

1988 ◽  
Vol 34 (4) ◽  
pp. 709-714 ◽  
Author(s):  
B E Jacobson ◽  
G Lockitch
Keyword(s):  
Atomic Absorption ◽  
Direct Method ◽  
Graphite Furnace ◽  
Direct Determination ◽  
Background Correction ◽  
Specific Reference ◽  
Reference Ranges ◽  
Term Infants ◽  
Graphite Furnace Atomic Absorption

Abstract We describe the development of a direct method for determination of selenium in serum by graphite-furnace atomic absorption spectrophotometry with deuterium background correction. We include palladium modifier to stabilize selenium in the presence of a strong reducing agent. Spectral interferences from iron are not evident in this system. Because an analysis requires only 20 microL of serum or plasma, the method is applicable to neonatal populations. At a selenium concentration of 0.75 mumol/L (approximately the mean found in our pre-term infants), the within-run CV is 5.3%. For a concentration of 1.83 mumol/L, which approximates our normal adult mean, within-run and between-run CVs are 2.7% and 3.4%. Accuracy is demonstrated by analytical recoveries ranging from 96% to 102%. We present reference values for pre-term and term infants, and age-specific ranges for infants to adults.

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