摘要
在HAc—NaAc介质中，乳化剂OP和β-环糊精（β-CD）存在下，铁与水杨基荧光酮（SAF）形成复杂络合物使荧光猝灭，由此建立了测定微量铁的荧光猝灭新方法。该体系的最大激发波长λex=365nm，最大发射波长λem=522nm。25mL溶液中Fe（Ⅲ）量在0．035～3．0μg范围内荧光猝灭值（ΔF）与Fe（Ⅲ）浓度呈线性关系，其回归方程为ΔF=44．3P（μg／25mL）＋55．7，相关系数r=0．9998，方法检出限为1．3μg／L。用于测定自来水中的微量铁，回收率在99．0％～100．5％之间。
A new fluorescence quenching method for the determination of trace ferrum is proposed in HAc-NaAc medium and in the presence of OP and β-CD,where a ternary complex is formed by Fe（Ⅲ） and salicylfluorone to conduce to fluorescence quenching. The maximum excitation and emission wave- lengths are 365 nm and 522 nm, respectively. The linear range is 0. 035--3.0 μg/25mL. The linear equation is ΔF=44. 3 ρ（μg/25 mL）＋55.7. The correlation coefficient is 0. 999 8 and the detection limit is sam 1.3 μg /L. The method has been applied to the direct determination of trace Fe（Ⅲ） in tap water ples with the recovery of 99.0-100.5%.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第1期65-67,共3页
Metallurgical Analysis
