Abstract： In order to improve the inductively coupled plasma atomic emission spectrometry quality and reduce the analytical detection limit, the effect of cesium additive in water sample on spectral intensity and signal-to-background ratio was studied. The excitation temperature and electron density of plasma were measured by multispectral slope method and Stark widening method, respectively. The experimental results showed that, after adding cesium additive in water sample, the spectral intensities of heavy metal elements including As, Cd, Hg and Ni were enhanced to varying degrees. When the content of cesium was 1.0 g/L, the spectral intensities of As, Cd, Hg and Ni increased by 31.13 %, 21.57 %, 28.15 % and 36.31 %, and the signal-to-background ratio increased by 31.60 %, 22.22 %, 27.68 % and 36.00 %, respectively. When the content of cesium in sample was 1.0 g/L, the excitation temperature of plasma increased by 130.71 K than that without cesium additive, and the electron density increased by 3.78 ×1012/cm3. Therefore, the cesium additive could enhance the inductively coupled plasma atomic emission spectrum quality.
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