摘要
Ｃｏ２ ＋ 和５ＢｒＰＡＤＡＴ 在含有ＮＨ２ＯＨ·ＨＣｌ 的ｐＨ＝ ５ 的磷酸盐缓冲溶液中，能生成稳定的红色络合物。用１２ ｍｏｌ／Ｌ 硫酸酸化，其颜色会变得更深，使得吸光度增加，其λｍａｘ ＝ ５７０ｎｍ ，ε５７０ ＝ １ ．４３ ×１０５ Ｌ·ｍｏｌ－ １·ｃｍ －１ 。在强酸性介质中测定，消除了常见离子包括Ｆｅ（ Ⅲ） 和Ｃｒ（ Ⅵ） 的干扰，提高了方法的选择性。将本法用于小麦、麸皮、大米、牛肉及茶叶等食品中微量元素钴的测定。
Cobalt and 5 Br PADAT formed stable red complex in a phosphate buffur solution at pH=5 containing NH 2OH·HCl.After acidification with 12 mol/L H 2SO 4,the color of the complex became darker and absorption of the light was also increased.It's λ max =570 nm,ε 570 =1.43×10 5 L·mol 1 ·cm 1 .Therefore the interferences of common ions including Fe 3+ and Cr(? were all eliminated,and the selection of the method is better.The recommended produce has been applied to the determination of Co 2+ in food samples,and the satisfactory results were obtained.
出处
《郑州粮食学院学报》
1999年第3期51-53,共3页
Journal of Zhengzhou Institute of Technology
