Application of Zeeman background correction to direct current plasma excited atomic absorption spectroscopy

2002 ◽  
Vol 17 (10) ◽  
pp. 1421-1424 ◽  
Author(s):  
Risto Oikari ◽  
Ville Häyrinen ◽  
Rolf Hernberg ◽  
Lauri Kettunen
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Direct Current ◽  
Atomic Absorption Spectroscopy ◽  
Background Correction ◽  
Direct Current Plasma ◽  
Zeeman Background Correction

Determination of Cobalt in Urine by Flameless Atomic Absorption Spectroscopy. Comparison of Direct Analysis Using Zeeman Background Correction and Indirect Analysis Using Extraction in Organic Solution

1986 ◽  
Vol 23 (3) ◽  
pp. 346-350 ◽  
Author(s):  
A A Bouman ◽  
A J Platenkamp ◽  
F D Posma
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Reference Values ◽  
Atomic Absorption Spectroscopy ◽  
Direct Analysis ◽  
Background Correction ◽  
Organic Solution ◽  
Flameless Atomic Absorption Spectroscopy ◽  
Zeeman Background Correction

Urinary cobalt was determined by flameless atomic absorption spectroscopy. Three methods were compared: (i) direct analysis with deuterium background correction after 11-fold dilution with distilled water (method D), (ii) analysis with deuterium background correction after extraction of cobalt from the urinary matrix in organic solution (method E), and (iii) direct analysis with Zeeman background correction (method Z). The detection limit of the direct analysis of urinary cobalt with deuterium background correction was 6 μg/L, this appeared to be insufficient for the determination of reference values and moderate enlarged cobalt values. Comparison of the extraction method and the Zeeman method revealed that these methods have similar reference values, detection limits, precision and recovery.

Aluminum determined in plasma and urine by atomic absorption spectroscopy with a transversely heated graphite atomizer furnace

1994 ◽  
Vol 40 (3) ◽  
pp. 431-434 ◽  
Author(s):  
C Bradley ◽  
F Y Leung
Keyword(s):  
Correlation Analysis ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Background Correction ◽  
Heating Cycle ◽  
Slope Coefficient ◽  
Correction System ◽  
Zeeman Background Correction

Abstract We compared a stabilized-temperature L'vov platform furnace containing an end-heated graphite atomizer (HGA) and transverse Zeeman background-correction system with a side-heated furnace system (transversely heated graphite atomizer; THGA) containing a longitudinal Zeeman background-correction system for the determination of aluminum in plasma and urine. The regression statistics for the correlation analysis of the two systems (slope coefficient = 0.995, intercept = -1.710, Sy/x = 0.021 micrograms/L) indicate that the systems generate comparable results. The newer technology of the THGA furnace with its more uniform and faster heating cycle allows a lower atomization temperature for aluminum, 2200 degrees C. Analyte carryover was significantly reduced in the THGA furnace system. The THGA system generates results equivalent to HGA in about one-third less time, thus making possible a greater throughput of samples in a busy laboratory.

Continuous Monitoring of Toxic Metals in Gas Flows Using Direct-Current Plasma Excited Atomic Absorption Spectroscopy

2001 ◽  
Vol 55 (11) ◽  
pp. 1469-1477 ◽  
Author(s):  
Risto Oikari ◽  
Ville Häyrinen ◽  
Tomi Parviainen ◽  
Rolf Hernberg
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Direct Current ◽  
Toxic Metals ◽  
Atomic Absorption Spectroscopy ◽  
Zeeman Effect ◽  
Monochromatic Light ◽  
Nitrogen Plasma ◽  
Heated Sample ◽  
Process Gas

A measurement apparatus employing direct current (dc) plasma excited atomic absorption spectroscopy was developed and demonstrated for continuous measurement of toxic metals in process gases. Process gas is continuously sampled along a heated sample line. Metal compounds contained in the gas are thermally decomposed by mixing the gas with a plasma jet produced with a dc nitrogen plasma torch. Transmission of monochromatic light is measured through the gas jet, and absorbance caused by metal atoms is distinguished from the background by means of the Zeeman effect. The metal concentration in the sample gas is calculated from the measured absorbance with the known dilution and decomposition factors taken into account. The detection limits of the current prototype are 0.04 mg/m3 for cadmium and 0.4 mg/m3 for lead. The measurement accuracy is better than 20%, and the maximum measurement rate is about 100 values per minute. The instrument was designed to withstand wet, corrosive, and particulate-laden flue gases at temperatures up to 1100 °C. The instrument can also be used, after minor modification, for measurements at pressurized conditions. The performance of the instrument was demonstrated in connection with a real fluidized bed combustor.

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