Hydride generation-resonance Rayleigh scattering and SERS spectral determination of trace Bi

In acidic solutions, Bi(III) was reduced by NaBH4 to form BiH3 gas. Using I-3(-) graphene oxide (GO) as absorption solution, the BiH3 gas reacted with I-3(-) to form I- that resulted in the I-3(-) concentration decreasing. In the absence of BiH3, the I-3(-) concentration was high, and as receptors it was closed to the surfaces of GO which was as donors. Then the surface plasmon resonance Rayleigh scattering (RRS) energy of GO transfers to I-3(-) heavily, and results in the RRS quenching severely. With the increase of the Bi(III) concentration, the receptors and the RRS energy transfer (RRS-ET) decreased, so the RRS intensity enhanced linearly at 370 nm. The RRS intensity was linear to the Bi(III) concentration in 0.05-5.5 mu mol/L, with a detection limit of 4 ng/mL Bi. A new RRS-ET spectral method was developed for the determination of trace Bi(III). Using I-3(-) as the absorption solution, silver nanorod (AgNR) as sol substrate and Vitoria blue B (VBB) as molecular probe, a SERS method was developed for detection of Bi. (C) 2016 Elsevier B.V. All rights reserved.