Determination of trace aluminum using resonance Rayleigh scattering method with chrome azurol S and hexadecyl trimethyl ammonium bromide system

In this experiment, the resonance Rayleigh scattering spectra of the Al(III)-chromium azure S-cetyltrimethyl ammonium bromide system were investigated. The optimal experimental conditions of the system were optimized, the interference of other ions to the system was investigated, and the reaction mechanism was discussed. The results show that: Aluminum(III) forms an anion with chromium azure S in a weakly acidic medium and then forms ionic association with cetyltrimethyl ammonium bromide under electrostatic and hydrophobic effects, which increases the resonance Rayleigh scattering intensity of the system. The mass concentration of Al(III) at 598.1 nm showed a good linear relationship with the resonance Rayleigh scattering intensity in the range of 0.02-0.16 mu g/mL with the correlation coefficient of 0.9989 and the detection limit of 1.8 ng/mL. The relative standard deviation (RSDS, n = 6) was less than 1.1%, and the spiked recoveries were in the range of 93.5-100.8%. The measured values were consistent with atomic absorption spectrometry.

Automated summary

The resonance Rayleigh scattering spectra of the Al(III)-chromium azure S-cetyltrimethyl ammonium bromide system were studied in this experiment. The optimal experimental conditions, interference of other ions, and reaction mechanism were investigated. The results showed that Al(III) forms an anion with chromium azure S and forms ionic association with cetyltrimethyl ammonium bromide, increasing the scattering intensity. The mass concentration of Al(III) showed a linear relationship with the scattering intensity in a certain range with good accuracy.