摘要
基于铁(Ⅲ)对水溶液中头孢拉定(CEPC)的荧光猝灭作用,建立了测定微量铁(Ⅲ)的荧光分析方法。在以 pH 为3.0的盐酸为介质、最大激发波长为351 nm、发射波长为431 nm、CEPC 质量浓度为0.11 g/L 的条件下,相对荧光强度与 Igc 呈良好的线性关系,测定铁(Ⅲ)浓度的线性范围为1.60×10^(-6) ～6.30×10^(-4)mol/L,检出限为6.25×10^(-7) mol/L,相对标准偏差为2.10%(n=11),加标回收率为94.3%～106.9%。该法具有良好的选择性,其他常见的共存离子不干扰测定,可直接用于测定环境水样中的铁(Ⅲ)含量。
Based on the quenching effect of Fe （Ⅲ） on the fluorescence of Cefradine （CEPC） in solution, a new and sensitive fluorimetric quenching method for the determination of micro Fe （ Ⅲ） has been developed. When the dosage of CEPC is 0.11 g/L in hydrochloric acid solution of pH 3.0, the maximum excitation and emission wavelengths of CEPC are 351 nm and 431 nm respectively. There is a good liner relationship between the relative fluorescence intensity and the concentration of Fe （ Ⅲ） ranged from 1.60 × 10^-6 to 6.30 × 10^-4 mol/L. The detection limit is 6.25 × 10^-7 mol/L. The relative standard deviation （n = 11 ） is 2. 10%. The average recovery is 94.3% -106.9%. The method has a good selectivity, and the coexisting ions do not interfere with the determination. It can be applied to the direct determination of Fe （Ⅲ） in environment water.
出处
《化工环保》
CAS
CSCD
北大核心
2008年第6期549-552,共4页
Environmental Protection of Chemical Industry
基金
湖南省自然科学基金资助项目(07JJ6021)
关键词
荧光光度法
荧光淬灭
头孢拉定
铁(Ⅲ)
分析方法
spectrophotofluorimetry
fluorescence quenching
Cefradine
iron
analytical method
