Abstract
Laser-induced photoacoustic spectroscopy was applied in order to determine trace amounts of iron adsorbed onto the surface of a solid resin Amberlite XAD-2 microparticle of 300 μm in diameter as an oxine (8-quinolinol) complex. The photoacoustic measurements were carried out with a single particle in order to avoid any scattering effects. The signal magnitude depended on the iron concentration, which ranged from 5×10−3 to 3 mg for one gram of resin. This dependence deviated from linearity as the concentration became larger than 40 fig per gram of resin. The nonlinear behavior was regarded as being a saturation phenomenon resulting from the spatial variation of the optical thickness due to the sample’s spherical form. The saturation effect could be eliminated by focusing the incident beam to a size sufficiently small with respect to the particle diameter
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Hsueh, YM., Harata, A., Kitamori, T. et al. Photoacoustic Determination of Trace Species Adsorbed on a Single Microparticle. ANAL. SCI. 6, 67–70 (1990). https://doi.org/10.2116/analsci.6.67
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DOI: https://doi.org/10.2116/analsci.6.67