Vapor Generation AAS

CHEMICAL VAPOR GENERATION AAS 4.1. Properties and Sample Requirements 

The two techniques for chemical vapor generation are different insofar as in CVAAS the chemical reaction generates already mercury atoms which only have to be volatilized and measured in an 

In both techniques a chemical reaction is used to generate the gaseous analyte species. In HGAAS an alkaline solution of sodium tetrahydroborate is the preferred reductant which reacts with the acid sample solution generating the analyte hydride and an excess of hydrogen, according to 

Chemical vapor generators of very many different designs are described in the literature. They can be classified into batch and flow systems, and the latter can be continuous flow or FI systems. 

Schematic design of a batch system for chemical vapor generation in the special configuration for cold vapor AAS with amalgamation (Courtesy of Perkin-Elmer). 

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