Fig. 1. Diagram of LIBS experimental setup

Fig. 2. Diagram of sample preparation

Fig. 3. Spectra of chelate resin with and without Cu and Mn. (a) Spectra of chelate resin with and without Cu; (b) spectra of chelate resin with and without Mn

Fig. 4. Characteristic line intensity and SBR versus laser energy. (a) Characteristic line intensity and SBR of Cu versus laser energy; (b) characteristic line intensity and SBR of Mn versus laser energy

Fig. 5. Characteristic line intensity and SBR versus delay time. (a) Characteristic line intensity and SBR of Cu versus delay time; (b) characteristic line intensity and SBR of Mn versus delay time

Fig. 6. Characteristic line intensity versus laser focus position. (a) Characteristic line intensity of Cu versus laser focus position; (b) characteristic line intensity of Mn versus laser focus position

Fig. 7. Effect of flow rate of sample solution on spectral intensity. (a) Effect of flow rate of sample solution on characteristic spectral intensity of Cu; (b) effect of flow rate of sample solution on characteristic spectral intensity of Mn

Fig. 8. Effect of pH value of sample solution on characteristic spectral intensity. (a) Effect of pH value of sample solution on characteristic spectral intensity of Cu; (b) effect of pH value of sample solution on characteristic spectral intensity of Mn

Fig. 9. Calibration curves. (a) Calibration curve of Cu; (b) calibration curve of Mn