Aziz-Alrahman A M
Int J Environ Anal Chem. 1984;19(1):55-61. doi: 10.1080/03067318408077017.
An atomic absorption spectrophotometric method is described for the determination of microgram quantities of zinc in canned juices. After sample digestion in concentrated nitric acid, the solution is evaporated till near dryness, and then a solution of 2 M HCl is added to form tetrachlorozincate (II) ion. This acid solution, containing the zinc complex is passed through an ion-exchange column (anion exchange resin, chloride form, which is preconditioned by passing 1 M HCl solution). Zinc is eluted from the column with 0.01 M HCl solution. After evaporation to dryness, the residue is dissolved in 1% (v/v) HNO3, and then atomized into an air-acetylene flame. The limit of detection of the method is 0.15 micrograms ml-1 Zn. The analytical aspects of the proposed method, including the standard addition technique are discussed.
本文描述了一种用原子吸收分光光度法测定罐装果汁中微量锌的方法。样品经浓硝酸消化后，将溶液蒸发至近干，然后加入2M盐酸溶液形成四氯锌酸（II）离子。含有锌络合物的该酸性溶液通过离子交换柱（阴离子交换树脂，氯型，预先用1M盐酸溶液预处理）。用0.01M盐酸溶液从柱上洗脱锌。蒸发至干后，残渣溶于1%（v/v）硝酸中，然后雾化进入空气-乙炔火焰。该方法的检测限为0.15微克/毫升锌。讨论了所提出方法的分析方面，包括标准加入技术。
