c. Treatment of standard solutions: Prepare dilutions of the Li standard solution to bracket
sample concentration or to establish at least three points on a calibration curve of emission
intensity against Li concentration. Prepare standards by adding appropriate volumes of standard
lithium solution to 25 mL water + 1.0 mL potassium ionization suppressant reagent in a 50-mL
volumetric flask. Dilute to 50.0 mL and mix. Both samples and standards will be in a 0.1% K
matrix to suppress ionization of lithium.