摘要
研制了基于新型分子导线化合物2-(2-(4-(2-(4-(2-(2,5-二庚基-4-(2-(噻吩-2-基)乙炔基)苯基)乙炔基)苯基)乙炔基)-2,5-二庚苯基)乙炔基)噻吩(简称FDB)测定铬(Ⅵ)的光化学敏感膜。研究表明:铬(Ⅵ)对固定于聚氯乙烯膜中的FDB有可逆荧光猝灭作用。敏感膜最佳组成为:55.0 mg聚氯乙烯、105.0 mg邻苯二甲酸二异辛酯(DIOP)和5.0 mg四苯硼钠(NaTPB)。选用最大激发波长为371 nm,发射波长为407 nm,在0.60 mol·L^(-1)硫酸溶液中,测定铬(Ⅵ)的线性范围为3.78×10^(-6)～1.26×10^(-6)mol·L^(-1),检出限(3S/N)为5.16×10^(-7)mol·L^(-1),响应时间小于1 min。敏感膜具有良好的重现性、可逆性和选择性,其他常见金属离子不干扰测定。应用于环境水中铬(Ⅵ)的测定,测定值与国标GB/T 7468—1987的测定结果相符,回收率为96.0%～106.3 %。
A new type of photochemical-sensing membrane for the determination of Cr（Ⅵ）, based on the reversible fluorescence-quenching of the conductor wire compound, 2-（2-（4-（2-（4-（2-（2,5-diheptyl-4-（2-thiophenyl- 2-）-ethinyl）-phenyl）-ethinyl）-phenyl）-ethinyl）-2,5-diheptophenyl）-ethinyl） thiophene （FDB in short） Was prepared by mixing an appropriate amount of FDB dissolved in 2 mL of tetrahydrofuran with 55. 0 nag of polyvinyl chloride （PVC）, 105. 0 mg of diiso-octyl-o-phthalate （DIOP） and 5. 0 nag of sodium tetraphenylboron, and making into membrane. Fluorescence detection was made in a 0.60 mol · L^-1 H2SO4 solution at the wavelengths of （λex） 371 nm and （λen） 407 nm. Linearity range for determination of Cr（Ⅵ） was kept between 3. 78×10^-6 --1.26×10^-3mol · L^-1. Detection limit （3S/N） of 5.16×10^-7Tmol · L^-1 was found for the method. Time of response was less than 1 rain. No interference by those common metal ions was observed. The proposed method was applied to the analysis of samples of lake and river water, giving results in consistency with the results found by the method of GB/T 7468--1987. Values of recovery found were in the range of 96.0%--106.3%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2009年第11期1257-1260,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
湖南城市学院科技计划项目(08C004)
国家高技术研究发展计划(863计划
2007AA06Z402)
上海市科委创新行动计划项目(08520510400)
关键词
光化学敏感膜
分子导线化合物
六价铬
Photochemical sensing membrane
Molecular conductor wire compound
Chromium（Ⅵ）
