提出了石墨炉原子吸收光谱法测定复合疏松剂中铝含量的方法.制备了涂钽石墨管以消除铝在石墨管中的记忆效应,采用硝酸镁和硝酸钯的混合溶液作为基体改进剂,灰化温度从700 ℃升至1 300 ℃.对升温程序作了详细的叙述.铝的质量浓度在80 μg·L-1范围内与其吸光度呈线性关系,检出限(3σ)为0.02 μg·L-1.应用此法分析了普通泡打粉和无铝泡打粉中的铝含量,加标回收率分别为91%,95%,相对标准偏差(n=6)分别为8.3%,7.9%.

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.