改性魔芋葡苷聚糖共振散射法测定铁含量  

Resonance Scattering Method for the Determination of Fe(Ⅲ) with Modified Konjac-glucomannan

作　　者：翟好英[1] 张金洋[1] 吴烨梅 

机构地区：[1]内江师范学院化学化工学院

出　　处：《化学试剂》2018年第2期179-182,共4页Chemical Reagents

基　　金：四川省教育厅重点科研项目(15ZA0289)

摘　　要：在酸性介质中,次氯酸根离子氧化魔芋葡苷聚糖（KGM）使其发生降解而得到改性KGM。由于改性KGM中含有亲水性的羟基（—OH）、羧基（—COOH）等活性基团,从而使得改性后的KGM水溶性大大增加。实验结果表明,改性KGM分子中所含有的活性基团（如羧基等）能吸附Fe^（3＋）并与其配位形成铁基配合物,使得体系的共振散射信号明显增强,且在343 nm处产生1个显著的共振散射峰。在0.056～14μg/mL浓度范围内,体系的共振散射强度变化值与Fe3＋浓度具有良好的线性关系,建立了一种共振散射法测定铁含量的方法。并将该法运用于测定钢铁废渣中Fe3＋含量,其加标回收率高达96.8%。Konjac glucomannan（KGM） was oxidized by hypochlorite ion to obtain modified KGM in acidic medium.Due to containing many active groups such as hydroxyl and carboxyl,the water-solubility of modified KGM is greatly increased.Moreover,the active groups of modified KGM can adsorb and coordinate with ferric ions to form coordination compound,which makes the resonance scattering intensity enhance distinctly and produces an obvious resonance scattering peak at 343 nm.In addition,there is a good linear relationship between the resonance scattering signal and the concentration of ferric ions in the range of 0.056~14μg/mL.Therefore,the resonance scattering method to determine iron content was established and applied to measure ferric content in the steel slag with the recovery of 96.8%.

关 键 词：魔芋葡甘聚糖 改性 FE3+ 吸附 共振散射法 

分 类 号：O657.3[理学—分析化学]