Atomic absorption spectrometry of cobalt in the presence of chelating agents

1980 ◽  
Vol 45 (12) ◽  
pp. 3313-3319 ◽  
Author(s):  
Josef Komárek ◽  
Dalibor Kolčava ◽  
Lumír Sommer
Keyword(s):  
Reaction Mechanism ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Chelating Agents ◽  
Absorption Spectrometry ◽  
Donor Atom ◽  
Optimum Conditions

The effect of chelating agents on the determination of cobalt in various flames, in a graphite cuvette and tantalum boat was studied considering the expected reaction mechanism of the atomization of cobalt and the reagent donor atom. A marked increase in the sensitivity of the determination of cobalt was observed in the presence of 1-(2-pyridylazo)-2-naphthol, pyrrolidinedithiocarboxylate, diethyldithiocarbamate, 8-mercaptoquinoline, 8-hydroxyquinoline and thenoyltrifluoroacetone for atomization from a tantalum boat. The optimum conditions for the determination of cobalt in the presence of 1-(2-pyridylazo)-1-naphthol are given.

Determination of molybdenum in rocks by atomic absorption spectrometry with electrothermal atomization after its separation with α-benzoinoxime

1984 ◽  
Vol 49 (2) ◽  
pp. 370-377 ◽  
Author(s):  
Dalibor Kolčava ◽  
Jan Janáček
Keyword(s):  
Hydrochloric Acid ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Tartaric Acid ◽  
Graphite Furnace ◽  
Accurate Determination ◽  
Absorption Spectrometry ◽  
Electrothermal Atomization ◽  
Optimum Conditions

A method has been worked out for a sensitive and accurate determination of molybdenum in rocks in contents of the order of 10-1 g/t. The sample is decomposed with acids and molybdenum is separated from practically all other elements by extraction with α-benzoinoxime from solution of 1.5 M hydrochloric acid and 0.13 M tartaric acid into chloroform, and determined in the extract by AAS with electrothermal atomization. The quantitativeness of the extraction has been examined and the optimum conditions for the determination in a graphite furnace have been established. The effects of chloroform and of the graphite atomizer on the signal of molybdenum have been investigated, and the accuracy of the method has been tested on GXR geochemical standards.

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