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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 .
Resonance Rayleigh scattering (RRS), secondary scattering (SOS) and frequency doubling scattering (MFS) of Victoria Blue 4R (VB4R) were very weak in 0 1 6 ~ 0 3 2mol / L hydrochloric acid solution. When selenium (IV) oxidizes I- to form I-3 anions and further forms an ion association complex with VB4R, the three kinds of scattering are greatly enhanced and the corresponding scattering spectra are produced. The maximum RRS wavelength is at 582 nm, The other RRS peaks at 320 nm, 410 nm, 4 52 nm, 4 70 nm, 80 0 nm and 94 0 nm were observed. At this time, the maximum SOS peak was at 81 0 nm and there were two smaller at 650 nm and 94 0 nm Of the SOS peak, while the maximum MFS peak is at 405 nm with two smaller MFS peaks at 320 nm and 475 nm. At the maximum scattering wavelength, selenium (IV) is between 0 and 100 μg / 2 5mL (RRS and MFS method) and 0 ~ 15μg / 25mL (SOS method) concentration range and the scattering intensity ΔI is proportional to the method has a high sensitivity, the detection limit of selenium (Ⅳ) were 0 2 4 μg / mL (MFS), 0 4 8 μg / mL (RRS) and 0 60 ng / ml (SOS) respectively.All the 3 methods can be used for the determination of trace selenium (Ⅳ).