Abstract：In inductively coupled plasma atomic emission spectrometry (ICP-AES), the magnetic treatment technique of water was used in the pretreatment of aqueous solution to improve the nebulization efficiency of sample, enhance the radiation intensity of light source and reduce the detection limit of spectral analysis. The results showed that the physical property of aqueous solution had significant change with the change of magnetic induction density. When the magnetic induction density was 280 mT, the surface tension and viscosity of solution were the lowest. With the prolonging of magnetizing time, the emission spectral intensity of elements in light source had different responses. When the aqueous solution was magnetized for 10 min, the emission spectral intensity of most elements was the highest. In order to understand the spectrum enhancing mechanism, one group of spectral intensity of iron was measured, and excitation temperature of plasma was obtained by slope method. One spectral line of argon was measured, and the electron density was obtained by Stark broadening method. The experiment indicated that the introduction of sample solution after magnetic treatment was an effective way to reduce the analytical detection limit.
