Determination of gallium in aluminium compounds by atomic absorption spectrometry

1988 ◽  
Vol 53 (4) ◽  
pp. 756-762 ◽  
Author(s):  
Věnceslava Tokarová ◽  
Josef Mareček
Keyword(s):  
Heat Treatment ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Solid Phase ◽  
Raw Materials ◽  
Graphite Furnace ◽  
Direct Injection ◽  
Absorption Spectrometry ◽  
Optimum Heat

A method is suggested for the determination of gallium in aluminium oxide and in raw materials for its production (aluminium sulphates, alums) by atomic absorption spectrometry with electrothermal atomization, based on direct injection of a suspension of Al2O3 in an ethanol-water 9 : 1 mixture into a tungsten atomizer. Suspensions of Al2O3 with known amounts of Ga embedded in the solid phase are found to suit best for calibration. Optimum heat treatment and atomization conditions are established. The behaviour of gallium in aqueous solutions and in Al2O3 suspensions during their heat treatment is compared for atomization in a tungsten atomizer and in a graphite furnace.

Determination of Ultra Trace Amounts of Copper by a Multi-Injection Technique of Electrothermal Atomic Absorption Spectrometry after Using Solid-Phase Extraction

2014 ◽  
Vol 97 (6) ◽  
pp. 1713-1718 ◽  
Author(s):  
Fatemeh Sabermahani ◽  
Mohammad Ali Taher
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Solid Phase ◽  
Graphite Furnace ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Injection Technique ◽  
Chemical Modifier ◽  
Determination Of Copper

Abstract A new method using a multi-injection technique combined with SPE was developed for the determination of copper (Cu) in environmental samples. The method is based on SPE of copper ions on naphthalene as its 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP)-ammonium tetraphenylborate complex, in the pH range 6.0–9.5, and determined by electrothermal atomic absorption spectrometry. No chemical modifier is required in the graphite furnace. The detection limit can be reduced to 1.5 ng/L using an injection volume of 25.0 μL (five 5.0 μL) without interference by the matrixes. The optimum pyrolysis and atomization temperatures were 500 and 2200°C, respectively, for the concentrated solution of Cu. The sensitivity for 1% absorption was 2.6 pg Cu. Eight replicate determinations for 0.1 μg Cu in 5.0 mL dimethylformamide gave an RSD of 2.3% for a single injection and 2.7% for a multi-injection. The procedure was validated with certified reference materials and successfully applied to the determination of copper in water and plant samples.

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