食品科学 ›› 2000, Vol. 21 ›› Issue (12): 107-111.

• 分析检测 • 上一篇    下一篇

包结PAN环糊精树脂相分光光度法测定微量钴

 姜子涛, 李荣   

  1. 天津商学院食品与生物工程系
  • 出版日期:2000-12-15 发布日期:2011-12-05

Study on PAN Included β-Cyclodextrin Polymer on Resin Phase Spectrophotometric Determination of Trace Amount of Cobalt

 JIANG  Zi-Tao, LI  Rong   

  • Online:2000-12-15 Published:2011-12-05

摘要: 以β-环糊精和环氧氯丙烷为原料,合成了环糊精树脂(β-CDP)。并将有机显色剂[1-(2-吡啶偶氮)-2-萘酚](PAN)包结到该树脂上得到了包结PAN的环糊精树脂(β-CDP-PAN)。β-CDP-PAN和溶液中的钴离子反应,在树脂上形成红色的络合物(lmax = 573 nm),生色后的树脂可直接用于比色测定。探讨了溶液的pH、温度和时间对反应的影响。铜、铬、铁、锰、镍、锌和钼离子对测定钴有一定的干扰,铁、铜和镍离子的干扰可利用EDTA(7.04×10-4 mol/L)消除,其它离子的干扰可利用酸降解的方法消除。所提出的方法用于紫菜中钴的测定,结果满意。添加回收和对比实验表明该法准确可靠。

关键词: &beta, -环糊精树脂, 树脂相分光光度法, PAN,

Abstract: β-Cyclodextrin polymer (β-CDP) was synthesized using epichlorohydrin as the cross-linking agent. The chromogenic agent, 1-(2-pyridylazo)-2-naphthol (PAN) was included or adsorbed on β-CDP and the modified polymer of PAN inclusion in β-CDP (β-CDP-PAN) was obtained. A new resin phase spectrophotometry by PAN has been developed for determination of cobalt at the μg level in laver. Copper, chromium, iron, manganese, nickel, zinc and moylbdenum have had interference for the determination of cobalt, which formed colored species with PAN in the resin phase. The interference from iron, copper and nickel could be masked completely with the masking solution composed of EDTA (7.04×10-4 mol/L), and the rest could be eliminated by means of the strong acid. The proposed method was used to determine cobalt in laver and the result was satisfyactory. The experiments in addition, recovery and comparison showed that the method was accurate and reliable.

Key words: &beta, -Cyclodextrin polymer Resin phase spectrophotometry PAN Coba;