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The mechanism of the atomization of boron and the enhancement of sensitivity by matrixmodifier Sr(NO_3)_2 in graphite furnace AAS were discussed.X-ray diffraction and thermodynamiccalculation were applied to study the mechanism of boron atomization with and without matrix mo-difier Sr(NO_3)_2.The formation of boron atom is due to the sublimation of solid boron which derivedfrom the reduction of B_2O_3 by carbon.The enhancement of boron signal in the presence of Sr(NO_3)_2is due to the formation of SrB_6 before atomization,which decreased the volatization losses of B_2O_3and retarded the formation of B_4C.
The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr (NO_3) _2 in graphite furnace AAS was discussed. X-ray diffraction and thermodynamiccalculation were applied to study the mechanism of boron atomization with and without matrix mo-difier Sr ( NO_3) _2. The formation of boron atom is due to the sublimation of solid boron which derived from the reduction of B_2O_3 by carbon. The enhancement of boron signal in the presence of Sr (NO_3) _2is due to the formation of SrB_6 before atomization, which decreased the volatization losses of B_2O_3 and retarded the formation of B_4C.