Highly sensitive determination of antimony in food by resonance Rayleigh scattering-energy transfer between grapheme oxide and I3−.

Sb(III) was reduced to SbH 3 gas and introduced to the I 3 − -grapheme oxide (GO) or I 3 − -silver nanorod (AgNR)-Victoria blue B (VBB) solutions. Resonance Rayleigh scattering energy transfer (RRS-ET) occurred between the donor GO and the acceptor I 3 − due to the overlap between the absorption peak of I 3 − and RRS peak of GO. When I 3 − was reduced by SbH 3 , RRS-ET weakened and the RRS intensity enhanced. The increased RRS intensity was linear to Sb concentration in the range of 2.1–376.6 μg/L. In the I 3 − -AgNR-VBB solution, I 3 − combined with VBB to form VBB-I 3 and there was a weak surface-enhanced Raman scattering (SERS) effect. When SbH 3 reduced I 3 − , the SERS intensity increased due to the release of SERS active VBB. The enhanced SERS intensity was linear for Sb concentration in the range of 8.4–292.9 μg/L. The RRS-ET method was applied for determination of Sb in food with satisfactory results. [ABSTRACT FROM AUTHOR]