摘要
研究了在PEG2000-Na2SO4-EBT双水相体系中Fe（Ⅲ）的显色反应条件，确定了以铬黑T（EBT）做萃取剂和显色剂时最佳的反应条件，结果表明，在pH9．0缓冲液中，Fe（Ⅲ）与EBT形成红色络合物，络合物最大吸收波长为496nm，摩尔吸光系数为1．34×10^5L／（mol·cm）。此法和普通光度分析法相比萃取效果好，灵敏度有较大提高，用于味精中铁的测定，效果满意。
Study on color reaction condition of Fe（ Ⅲ ） in polyethylene glycol--2000（PEG） --Na2SO4 --eri- ochrome black T（EBT） two--phase aqueous system, the best reaction condition by using the EBT as the extractant and color reaction indicator was established. At prig. 0, Fe（Ⅲ） and PEG formed a red complex substance, the maximum absorption of the complex was 496nm, and the molar absorptive was 1.34 × 10^5 L/（tool · cm）. Compared with the photometric analytical method, the extraction effect of this method was better, and the precision had a great improvement. The proposed method has been applied to the determination of small amounts iron with satisfactory result.
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2007年第6期133-135,共3页
Food and Fermentation Industries
基金
河南省科技厅自然科学研究项目(No.200410467013)
关键词
双水相体系
分光光度法
铁
味精
two-phase aqueous system, iron, spectrophotometry, glutamate
