Determination of microgram amounts of some transition metals in sea water by methyl isobuthyl ketone-nitric acid successive extraction and flameless atomic absorption spectrophotometry

1978 ◽  
Vol 50 (9) ◽  
pp. 1250-1253 ◽  
Author(s):  
Tsu Kai. Jan ◽  
David R. Young
Keyword(s):  
Nitric Acid ◽  
Transition Metals ◽  
Atomic Absorption ◽  
Sea Water ◽  
Atomic Absorption Spectrophotometry ◽  
Flameless Atomic Absorption ◽  
Absorption Spectrophotometry ◽  
Successive Extraction

Comparison of Four Methods for Digesting Food Samples for Determination of Trace Levels of Cadmium by Flameless Atomic Absorption Spectrophotometry

1988 ◽  
Vol 71 (5) ◽  
pp. 1033-1037
Author(s):  
Marie T Cabanis ◽  
Genevieve Cassanas ◽  
Jean C Cabanis ◽  
Suzanne Brun
Keyword(s):  
Nitric Acid ◽  
Atomic Absorption ◽  
Analysis Of Variance ◽  
Atomic Absorption Spectrophotometry ◽  
Food Samples ◽  
Cream Cheese ◽  
Digestion Procedure ◽  
Flameless Atomic Absorption ◽  
Absorption Spectrophotometry

Abstract We compared 4 digestion procedures, namely, sulfuric-nitric acid in an open flask, nitric acid under pressure, sulfuric-nitric acid with refluxing, and nitric-hydrochloric-peroxide with refluxing, for the determination of cadmium by flameless atomic absorption spectrophotometry in 3 foodstuffs: rice, beef, and cream cheese. The foodstuffs were homogenized and divided into several batches for analysis. The results were evaluated using a 2-way cross analysis of variance. The study revealed that the digestion procedure was a highly significant factor (P < 10 4) in the analysis of the 3 foods; whereas the nature of the foodstuffs was not significant for rice and meat and only slightly significant (P <10~2) for cream cheese. When the foodstuffs were spiked with a known amount of cadmium, we observed a loss of the metal when the sulfuric-nitric acid procedure in an open flask and the nitric-hydrochloric-peroxide digestion procedure were used. Taken together, the results of the present study indicate that the choice of the reagents used for digestion of foodstuffs is a crucial factor for cadmium determination by flameless atomic absorption spectrophotometry.

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