石墨炉原子发射法测定饮料中的铝

Determination of Aluminum in Drink by Graphite Furnace Atomic Emission Spectrometry

石墨炉原子发射法(GFAES)是近年来发展起来的一种新的分析方法,该法对某些易激发元素(如K、Na、Ba、Al等)的测定灵敏度和稳定性皆优于石墨炉原子吸收法(GFAAS).本文在非火焰原子吸收装置上,对铝的GFAES法测定进行了较详细的研究,并通过测定不同包装的同类饮料中铝的含量,考察了方法的可靠性和精度,结果发现,该法完全可用于饮料中微量铝的测定.当被测溶液中铝的含量在0.00～0.25ppm时,铝的发射强度与浓度呈线性关系.加入回收试验表明,方法的回收率达96.0%～102.0%,对饮料中常见的各种成份进行干扰试验,发现100倍的K^+、Na^+、Ca^(++)、Mg^(++)、CO_3^-和50倍的柠檬酸,苯甲酸等不干扰铝的测定.

Graphite furnace atomic emission spectrometry (GFAES) is a new method that has been developed recently.Using this method, several easily excited elements such as K, Na, Ba, Al etc can be easily determined and thier sensitivities are higher than that obtained from atomic absorption spectrometry (AAS).This experiment used this method to determine the content of aluminum in the same drink contained in different containers.It found that content of aluminum in caned drink and soft packing is nearly double that of bottled drink.The results indicate that the emission of aluminum in the drink is propotional to the concentration of aluminum and the calibration curve covers a linear range of 0-0.25μg/ml.The additional recoveries are 96～102% and hundred fold of K^+, Na^+, Ca^(+2), Mg^(2+), CO_3^(2-), Citric acid and Benzoic acid do not interfer.