摘要
本文提出了一种双显色双波长系数补偿法测定食品中微量铝、铁的新方法，在ｐＨ＝６．２缓冲液中，以络天青Ｓ为显色剂选择６２２／５０６ｎｍ波长对测定铝，以５－Ｂｒ－ＰＡＤＡＰ为显色剂选择５６０／６６０ｎｍ波长对测定铁，不经分离可直接测定样品中的铝、铁，铝量在０．２～５．０μｇ／２５ｍｌ、铁量在１．０～１５．０μｇ／２５ｍｌ符合朗伯比耳定律。本法应用于食品中铝、铁测定，得到较满意结果。
A new DW-spectrophotometric method for the determination of microamounts of aluminium and iron in foodstuffsis reported in this paper. CAS and 5-Br-PADAP are used as chromogenic reagents for aluminium and iron respectively, and thechromogenic reactions are carried out simultaneously in the same solution buttered at pH 6. 2. Measuring wavelengths and refer-ence wavelengths of 622/506 nm and 560/660 nm are chosen for the determination of Al(Ⅲ) and Fe (Ⅱ) respectively, The cali-bration curves are linear in the ranges of Al 0. 2～5. 0μg/25ml and Fe 1. 0～15. 0μg/25ml. The proposed method has been ap-
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1993年第6期332-334,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
铝
铁
吸光光度法
食品
Dual Wavelength Spectrophotometry
Aluminium
Iron
Chrome Azurol S
5-Br-PADAP
