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在pH为3.20~3.40的弱酸性介质中,稀土金属元素钐(Ш)与钕(Ш)均能使刚果红的荧光显著猝灭。实验表明:刚果红的最大发射波长(λem)为419nm,在钐(Ш)和钕(Ш)的存在下,刚果红荧光猝灭程度(ΔF)与钐(Ш)和钕(Ш)的浓度呈线性关系。钐(Ш)和钕(Ш)的检出限分别为0.0826#g/mL和0.1088#g/mL,线性范围为0.004~2.8mg/mL和0.004~1.6mg/mL。文中优化了反应条件的影响,据此发展了以刚果红为荧光探针的灵敏、简便、快速测定钐(Ш)与钕(Ш)的新方法。将方法用于茶叶中钐(Ш)与钕(Ш)含量的快速测定,结果满意。
In mild acid medium with the pH of 3.20 ~ 3.40, the fluorescence of Congo red can be significantly quenched by samarium (Ш) and neodymium (Ш). The experimental results show that the maximum emission wavelength (λem) of Congo red is 419 nm. The fluorescence intensity of Congo red (ΔF) and the concentrations of samarium (Ш) and neodymium (Ш) in the presence of samarium (Ш) and neodymium A linear relationship. The detection limits of samarium (Ш) and neodymium (Ш) were 0.0826 # g / mL and 0.1088 # g / mL, respectively. The linear range was 0.004 ~ 2.8mg / mL and 0.004 ~ 1.6mg / mL. In this paper, the influence of reaction conditions is optimized, and a new method of sensitive, simple and rapid determination of samarium (Ш) and neodymium (Ш) using Congo red as fluorescent probe has been developed. The method was applied to the determination of samarium (Ш) and neodymium (Ш) in tea leaves with satisfactory results.