Direct determination of manganese in seawater with the L'vov platform and Zeeman background correction in the graphite furnace

1981 ◽  
Vol 53 (12) ◽  
pp. 1866-1872 ◽  
Author(s):  
G. R. Carnrick ◽  
W. Slavin ◽  
D. C. Manning
Keyword(s):  
Graphite Furnace ◽  
Direct Determination ◽  
Background Correction ◽  
Zeeman Background Correction

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.

Direct determination of cadmium in urine with use of a stabilized temperature platform furnace and Zeeman background correction.

1983 ◽  
Vol 29 (3) ◽  
pp. 477-480 ◽  
Author(s):  
E Pruszkowska ◽  
G R Carnrick ◽  
W Slavin
Keyword(s):  
Direct Determination ◽  
Background Correction ◽  
Matrix Modifier ◽  
Cadmium In Urine ◽  
Individual Variations ◽  
Analytical Recovery ◽  
The Matrix ◽  
The Mean ◽  
Zeeman Background Correction

Abstract In this determination of Cd in urine, simple aqueous standards were used to which NaCl and the matrix modifier were added. The urine was diluted fivefold with water. The mean analytical recovery of added Cd for urine samples was 101%, with individual variations of less than 4%. We used the stabilized temperature platform furnace, Zeeman background correction, pyrolytically coated graphite tubes, and (NH4)2HPO4 plus HNO3 as a matrix modifier. The sensitivity of the method provided a characteristic amount of 0.35 pg of Cd per 0.0044 A X s, obtained with integrated absorbance readings. The absolute Cd detection limit in urine was 0.15 pg, corresponding to 0.04 microgram/L of urine. Lower relative detection limits for Cd in urine can be attained if the analytical situation demands it.

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