GFAAS Determination of Aluminum in Composite Baking Powder

GFAAS was applied to the determination of aluminum in composite baking pawder.Graphite tube coated with tantalum was prepared and used to avoid memory effect of aluminum.A mixed solution of magnesium nitrate and palladium nitrate was used as matrix modifier,and ashing temperature was elevated from 700 ℃ to 1 300 ℃.Program of temperature elavation was described in detail.Linear relationship between values of absorbance and mass concentration of aluminum was obtained within 80 μg·L-1,with detection limit (3σ) of 0.02 μg·L-.The proposed method was used in the analysis of common baking powder with and without aluminum.The values of recovery found by standard addition method were 91%,95%,and values of RSD′s (n=6) found were 8.3%,7.9%,respectively.