2,4-二氯苯基荧光酮测定食品中的微量铁  

Spectrophotometric Determination of Fe(Ⅲ) in Foods with 2,4-Dichlor-phenylfluorone and TritonX-100

作　　者：李文静[1] 敖登高娃[1] 刘惠民[2] 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021 [2]内蒙古农业大学基础部,呼和浩特010019

出　　处：《内蒙古大学学报（自然科学版）》2005年第2期238-240,共3页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙古自然科学基金(200208020114)

摘　　要：研究了在表面活性剂TritonX-100的存在下,显色剂2,4-二氯苯基荧光酮(DCIPF)与铁形成三元胶束络合物的反应条件.在pH=4.40的HCl-(CH2)6N4缓冲介质中,在表面活性剂TritonX-100存在下,铁与DCIPF形成组成比为1∶4的络合物,其最大吸收峰位于570nm处,表观摩尔吸光系数为ε=1.30×105L·mol-1·cm-1,铁含量在0～0.4μg/mL范围内符合比耳定律,大多数常见的阳离子不干扰铁的测定,此方法用于小麦粉、大米粉标样中铁的测定,结果满意.The condition of colour reaction of Fe(Ⅲ)-DCIPF in the presence of TritonX-100 was studied.In the pH 4.40 buffer solution of HCl-(CH_2)_6N_4,Fe(Ⅲ) reacts with DCIPF and TritonX-100 and forms a stable red complex with the maximum absorption at 570 nm,the apparent light absorption coefficient per mol ε=1.30×10~5 L·mol^(-1)·cm^(-1).Beer′s law is obeyed in the concentration range of 0~0.4 μg/mL for Fe(Ⅲ).The molar ratio of Fe(Ⅲ):DCIPOF in the complex is 1∶4.This method has good selectivity.It has been applied to the determination of Fe(Ⅲ) in standard samples of wheat and rice powder.

关 键 词：铁 2 4-二氯苯基荧光酮 分光光度法 

分 类 号：O657.32[理学—分析化学]