Determination of Traces of Aluminum by Resonance Rayleigh Scattering, Second Order Scattering and Frequency Doubling Scattering Spectrometry of Eosin Y

It was shown that in study of the reaction between eosin Y and Al(Ⅲ) in an acetate buffer medium of pH 5.0 by RRS, SOS or FDS, enhancement of spectral intensities was boserved in either case. Working wavelengths selected for the 3 methods were λex=λem=598 nm (for RRS), λex=330 nm, λem=660 nm (for SOS) and λex=604 nm, λem=302 nm (for FDS). Concentration of eosin Y solution used was 5.0×10-5mol·L-1. Time and temperature chosen for the reaction were 3 min and room temperature. As shown by experimental results, linear relationships between values of ΔIRRS, ΔISOS of ΔIFDS and mass concentration of Al(Ⅲ) were kept in definite ranges, with detection limits (3s) of 7.5, 4.0, 8.0 μg·L-1 respectively. The method of SOS behaved to have broader linearity range (0.012-1.5 mg·L-1) and lowest detection limit. It was applied to analysis of samples of human hair and tea, giving results in consistency with those obtained by AAS. Recovery was tested by standard addition method, results of recovery found were in the range of 96.3%-105%, with RSD′s (n=7) less than 5%.