Nanogold Resonance Rayleigh Scattering Method for Trace NO₂^- Based on P-Aminobenzene Sulfonic Acid-Α-Naphthylamine Colored Reaction

Abstract:

In acidic condition, NO₂^- combined with p-aminobenzene sulfonic acid by diazotization, and then reacted with α-naphthylamine to form purple azo dye. The resonance Rayleigh scattering (RRS) signal of the color system was detected by nanogold probe. Under the chosen conditions, the decreased RRS intensity ΔI (ΔI= I_b - I) at 500 nm was linear to the NO₂^- concentration in the range of 7.0×10^-2-42.0μmol/L, with a regression equation of ΔI=6.72 C - 6.93, a correlation coefficient of 0.9982 and a detection limit of 2.6×10^-4 mol/L NO₂^-.

• Periodical: Advanced Materials Research (Volume 716)
• Pages: 62-65
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.716.62
• Online since: July 2013
• Authors: Gui Qing Wen, Ting Sheng Li, Zhi Liang Jiang
• Keywords: Nanogold Probe, NO₂^-, Resonance Rayleigh Scattering Method

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