中文摘要：

依据文献合成了巯基丙酸修饰的银纳米粒子,并用共振光散射法调查了它们与稀土离子的相互作用.在pH 7.5的Tris-HCl缓冲介质中,银纳米粒子在467 nm呈现一弱的共振光散射峰.Eu3＋离子的加入导致体系共振光散射峰显著增强,并伴随47 nm（从467到514 nm）的散射峰红移.上述光谱变化可能是由于Eu3＋离子与纳米粒子表面的羧基发生配位作用所导致的粒子间的聚集引起的.根据体系对其它稀土离子类似的信号响应,我们建立了一种测定稀土离子总量的共振光散射新方法.最佳条件下,稀土离子浓度在6.0×10-7-8.0×10-6mol/L范围内与共振光散射强度呈正比,检测限为2.8×10-8mol/L.该方法简便、灵敏,用于环境水样中稀土离子总量的测定,结果令人满意.

英文摘要：

Mercaptopropionic acid-functionalized silver nanoparticles（MPA-SNPs） were prepared according to the literature,and their interactions with lanthanide ions（Ln3＋） were investigated by using resonance light scattering（RLS） technique.The MPA-SNPs display a weak RLS peak at 467 nm in pH 7.5 Tris-HCl medium.With the addition of Eu3＋ ion,a significant RLS enhancement with a 47 nm RLS peak red-shift（from 467 nm to 514 nm） was observed due to the aggregation between the particles,which should be ascribed to the formation of carboxylate complexes between Eu3＋ and carboxyl on the surface of the MPA-SNPs.Based on the similar RLS response to other Ln3＋,a novel RLS method has been developed for the measurement of total amount of Ln3＋.Under the optimum conditions,the RLS intensity was proportional to the concentration of Ln3＋ in the range of 6.0×10-7-8.0×10-6 mol/L.The detection limit is 2.8×10-8 mol/L.The method was simple,and could be applied to the determination of Ln3＋ in real samples with satisfactory results.