Effect of liquid aerosol temperature on the detection performance of LIBS for analysis of phosphorus element in water

Abstract

For analyzing the phosphorus (P) element in water, a liquid aerosol is used as a sampling method of laser-induced breakdown spectroscopy (LIBS). To further improve the detection performance of liquid aerosol-LIBS, the effect of liquid aerosol temperature on the qualitative and quantitative analysis was investigated. With increasing the liquid aerosol temperature, the emission intensity of P increased with the temperature; the threshold energy density (E_th) of P I 213.618 nm decreased from 9.98 to 6.62 J cm⁻², and the optimal laser energy density reduced from 26.00 to 18.70 J cm⁻². In addition, the LoD of P decreased from 5.22 to 1.81 ppm, and the average relative standard deviation (ARSD) of the intensity of P I 213.618 nm was similar. Furthermore, the R², the average relative error (ARE), and the root mean square error of cross validation (RMSECV) were improved from 0.9926 to 0.9964, 8.93 to 5.95%, and 4.85 to 2.91 ppm. The results indicate that liquid aerosol temperature affects the sensitivity, LoD, and accuracy of liquid aerosol-LIBS for the analysis of P in water.