Abstract
The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO3)2 in graphite furnace AAS were discussed. X-ray diffraction and thermodynamic calculation were applied to study the mechanism of boron atomization with and without matrix modifier Sr(NO3)2. The formation of boron atom is due to the sublimation of solid boron which derived from the reduction of B2O3 by carbon. The enhancement of boron signal in the presence of Sr(NO3)2 is due to the formation of SrB6 before atomization, which decreased the volatization losses of B2O3 and retarded the formation of B4C.
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