Hutchinson D J, Disinski F J, Nardelli C A
J Assoc Off Anal Chem. 1986 Jan-Feb;69(1):60-4.
A rapid method for the determination of sub-part-per-million levels of copper in infant formula, which does not require decomposition of the sample matrix before analysis, has been developed. The method uses L'vov platform graphite furnace atomic absorption spectroscopy (GFAAS), a technique that greatly reduces matrix interferences limiting the applicability of normal GFAAS. The sample preparation consists of dilution of a weighed sample of infant formula to a known volume with a 0.5% solution of Triton X-100 in deionized water. The accuracy of the method, as assessed from the results of overspike recovery studies (96.5-101.3% recovery) for different matrix types and comparison to results generated with alternative methodologies, can be considered excellent. The overall precision of the method ranges from 2.5 to 4.3% RSD for different matrix types.
已开发出一种快速测定婴儿配方奶粉中百万分之几水平铜的方法，该方法在分析前无需对样品基质进行分解。该方法采用热解涂层石墨管平台石墨炉原子吸收光谱法（GFAAS），这项技术能极大减少限制常规石墨炉原子吸收光谱法适用性的基质干扰。样品制备包括将称取的婴儿配方奶粉样品用0.5% Triton X - 100的去离子水溶液稀释至已知体积。根据不同基质类型的加标回收研究结果（回收率为96.5 - 101.3%）以及与其他方法所得结果的比较来评估，该方法的准确度堪称优异。对于不同基质类型，该方法的总体精密度范围为相对标准偏差2.5%至4.3%。
