机构地区: 暨南大学生命科学技术学院化学系
出 处: 《光谱学与光谱分析》 2006年第2期313-316,共4页
摘 要: 常温常压下,在0.24mol·L^-1的盐酸介质中,二氧化硒与过量的抗坏血酸(Vc)作用,生成单质硒Se(0),获得含有纳米硒微粒的均匀溶液;采用透射电镜和激光散射技术,测出Se(0)以26-243nm的球形聚集状态存在,并在470nm处有最强的共振瑞利散射(RRS),在入射波长2倍和1/2处分别有二级散射(SOS)和倍频散射(MFS),其共振瑞利散射强度△ I470 与Se(Ⅳ)的浓度在2.82×10^-9~5.64×10^-6g·mL^-1范围内呈线性关系,相关系数为0.997。 In the HCl solution, selenium(Ⅳ) and excessive ascorbie acid(Vc) formed selenium(0), which homogeneously and steadily existed in liquid phase system. The Se(0) particles were aggregating spheres and their sizes were 26-243 nm from transmission electron microscope(TEM) and laser light scattering image. The nanometer Se(0) solution produced strongest resonance rayleigh scattering(RRS) at 470 nrn. The intensity of RRS at 470 nm was linear with the concentration of Se(Ⅳ) in the range of 2.82 × 10^-9-5. 64 × 10^-6 g · mL^-1 (r=0. 997). Moreover, obvious Second-order scattering(SOS) and multiple frequence scattering(MFS) appeared at the same time.