Analysis of liquid sodium purity by laser-induced breakdown spectroscopy. Modeling and correction of signal fluctuation prior to quantitation of trace elements

► Direct analysis of liquid sodium purity is performed using LIBS. ► Calibration lines are obtained using the standard addition method. ► Detection limits are calculated for lead and indium. ► Intensity drifts are observed due to pressure variations. ► Drifts are modeled and corrected to decrease the analytical signal noise.