Abstract
The well-known determination of beryllium with chrome azurol S may be carried out at ph 4.9±0.1 (pyridine or acetate), at ph 6.74±0.2 (TRIS buffer), at pH 10.0±0.2 in aqueous medium, or at pH 6.5±0.4 (hexamethylenetetramine) in the presence of polyvinyl alcohol. These conditions correspond to the sole presence of three particular complexes of beryllium with chrome azurol S. In presence of polyvinyl alcohol, the sensitivity reaches 1.75 ng Be/ml for an absorbance of 0.01 at 615 nm. EDTA, Ca-EDTA and Ca-CDTA are effective masking agents in the different procedures.
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