ICCD cooling temperature effects on the quantitative analysis performance of plasma amplification LIBS for detection of nitrogen in water

The performance of the intensified charge-coupled device (ICCD) detector directly affects the quantitative analysis performance of plasma amplification laser-induced breakdown spectroscopy (LIBS). This study research on the impact of different ICCD cooling temperatures (10 ℃, 0 ℃, −10 ℃, −20 ℃, and −30 ℃) on plasma amplification LIBS analytical performance for analysis of N in water. The results shown that with the temperature decreased, the R² of the calibration curve increased from 0.812 to 0.990, the limit of detection was reduced from 23.762 mg·L⁻¹ to 0.131 mg·L⁻¹; the average relative error (RE_AV) and root mean square error of cross-validation (RMSECV) were improved, which was reduced from 34.97% to 5.04% and 19.8858 mg·L⁻¹ to 4.8674 mg·L⁻¹, respectively. The experimental results demonstrate that reducing the ICCD cooling temperature can improve the sensitivity and accuracy of LIBS quantitative analysis.