摘要
在 0 1 6～ 0 3 2mol/L的盐酸溶液中 ,维多利亚蓝 4R(VB4R)的共振瑞利散射 (RRS)、二级散射 (SOS)和倍频散射 (MFS)均十分微弱 .在过量碘化物存在下 ,当硒 (Ⅳ )氧化I-形成I-3 配阴离子并进一步与VB4R反应形成离子缔合配合物时 ,3种散射均大大增强并产生相应的散射光谱 .最大RRS波长位于 582nm ,另在 3 2 0nm ,4 1 0nm ,4 52nm ,4 70nm ,80 0nm和 94 0nm处有强度较低的RRS峰 ;此时最大SOS峰位于 81 0nm ,并在 650nm和94 0nm有两个较小的SOS峰 ,而最大MFS峰位于 4 0 5nm并在 3 2 0nm和 4 75nm处有两个较小的MFS峰 .在各自的最大散射波长处 ,硒 (Ⅳ )在 0～ 1 0 μg/2 5mL(RRS和MFS法 )和 0～ 1 5μg/2 5mL (SOS法 )的浓度范围内与散射强度ΔI成正比 .方法有很高的灵敏度 ,对硒 (Ⅳ )的检出限分别为 0 2 4 μg/mL (MFS) ,0 4 8μg/mL(RRS)和0 60ng/ml(SOS) .3种散射法均可用于痕量硒 (Ⅳ )的测量 .
In 0\^16～0\^32mol/HCL solution, the resonance Rayleigh scattering(RRS), multple frequence scattering(MFS) and second\|order scattering(SOS) of victoria blue 4R(VB4R) are very faint. However, in the presence of excess iodide, when selenium (Ⅳ) oxidizes I\+-, producing I\+-\-3 anionic complex which further reacts with VB4R to form an ion\|association complex, the three scattering are all enhanced gratly and three different spectra appenared. The maximum RRS peak is at 582 nm and have some smaller RRS peaks at 320 nm, 410 nm, 452 nm, 420 nm, 800 and 940 nm; the maximum SOS peak is at 810 nm and have two smaller scattering peaks at 650 and 940nm; the maximum MFS peak is at 405nm and have two smaller MFS peaks at 320 and 425 nm. The intensities of the three scattering are directly proportional to the concentration of selenium (Ⅳ) in the range 0～1.0 μg/25 mL for RRS and MFS, and 0～1 5 μg/25mL for SOS. The methods have very high stusitivities ,the detection limits for selenium (Ⅳ) are 0\^24 ng/mL for MFS method, 0\^48 ng/mL for RRS and 0 60 ng/mL for SOS method, respectively. The three scattering methods can be all applied to the determination of trace amounts of selenium(Ⅳ)
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2000年第4期408-412,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目!( 2 9875 0 19)
99’教育部春晖计划资助项目
关键词
硒
共振瑞利散射
二级散射
碘化物
维多利亚蓝4R
Selenium(Ⅳ)
resonance Rayleigh scattering
multple frequence scattering
second-order scattering
iodide
victoria blue 4R.
