【摘要】 目的建立一种无需事先消化测定牛奶稀释样中的铝的炉内直接消化石墨炉原子吸收法。方法样品经水稀释后直接进样测定。结果方法的检出限为0.052mg/kg,样品测定的精密度小于10%。样品加标回收率为113.4%和116.1%。在石墨炉升温过程中采用分步干燥和延长干燥时间,灰化温度和原子化温度设置分别为1650℃和2200℃,采用0.015mgMg(NO3)2,0.05mgNH4H2PO4,0.005mgPd(NO3)2混合溶液作为基体改进剂,在这些条件下,可以采用炉内直接消化石墨炉原子吸收法测定牛奶中的铝,基体不干扰测定结果。结论建立的直接消化石墨炉原子吸收法可以测定牛奶样品中铝的含量,结果令人满意。更多还原

【Abstract】 Objective To establish a method for determination of aluminum in diluted milk samples by graphite furnace atomic absorption spectrometry with furnace interior direct digestion.Methods The samples were directly determined after diluted with water.Results The detection limit for Al in milk was 0.052mg/kg,precision of aluminum was less than 10% and the recovery of Al in milk was 113.4% and 116.1%.The milk matrix interference to aluminum was decreased when 0.015mgMg(NO3)2,0.05mgNH4H2PO4,0.005mgPd(NO3)2 were chosen as matrix modifier,and a two-step drying procedure was used.The pyrolysis temperatures and atomization temperature were 1650℃ and 2200℃.Conclusion The technique of direct determination of aluminium from milk by graphite furnace atomic absorption spectrometry with furnace interior direct digestion has been established and the results of determination is satisfactory.更多还原