引用本文:
龙立平, 王柯敏, 杨荣华, 钟桐生. 用于测定铁离子的光化学敏感膜[J]. 应用化学,
2003, 20(4): 341-345.
Citation: LONG Li-Ping, WANG Ke-Min, YANG Rong-Hua, ZHONG Tong-Sheng. An Iron(Ⅲ) Sensing Membrane Based on Fluorescence Quenching[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 341-345.
Citation: LONG Li-Ping, WANG Ke-Min, YANG Rong-Hua, ZHONG Tong-Sheng. An Iron(Ⅲ) Sensing Membrane Based on Fluorescence Quenching[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 341-345.
用于测定铁离子的光化学敏感膜
摘要:
基于Fe3+对固定于聚氯乙烯(PVC)膜中的N,N'二苄基-3,3',5,5'-四甲基联苯二胺(TMBD)有可逆荧光猝灭作用,研制成测定Fe3+浓度的光化学敏感膜。该敏感膜最佳组成为:50mg PVC、100mg癸二酸二异辛脂(DOS)和30mg TMBD。在pH=3.2的HAc-NaAc缓冲溶液中测定Fe3+,其线性响应范围为3.98×10-6~1.00×10-3 mol/L,检测限为1.00×10-7mol/L,响应时间小于1 min。该敏感膜具有良好的重现性、可逆性和选择性,其它常见阴离子和阳离子不干扰测定。用该敏感膜制成的光化学传感器来测定人发、绿豆和奶粉中铁的含量,结果与原子吸收分光光度法一致。
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关键词:
- 光化学传感器
- / 荧光猝灭
- / 二苄基四甲基联苯二胺
- / 铁离子
English
An Iron(Ⅲ) Sensing Membrane Based on Fluorescence Quenching
Abstract:
An optical chemical sensor has been developed for the determination of iron (Ⅲ) based on reversible fluorescence quenching of N,N'-dibenzyl-3,3',5,5'-tetramethylbenzidine (TMBD) immobilized in a plasticized poly (vinyl chloride)(PVC) membrane.The sensing membrane consisted of 50 mg PVC,100 mg dioctyl sebacate (DOS) and 3.0 mg TMBD.The maximum response of the optode membrane for Iron (Ⅲ) was obtained in HAc-NaAc buffer solution.At optimum conditions the relationship between sensor responce and the concentration of Fe3+ ions was linear from 3.98×10-6 to 1.00×10-3 mol/L,with detection limit of 1.00×10-7 mol/L.The response time was less than 1 min.The sensing membrane has the advantage of high reproducibility,reversibility of the fluorescence signals and good selectivity.Common anions and cations do not interfere the measurements.It was applied for the direct determination of Fe3+ in human hair,green gram and milk powder samples.The results were in good agreement with those obattained by AAS method.
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