Fig. 3. (a–c) ATR-FTIR absorbance of the Li3PO4 (LiOH + H3PO4), LiCl (LiOH + HCl), and NaCl (NaOH + HCl) solutions depending on the molarity of Li+ and Na+ cations. (d–f) Differences in the absorbance of the O–H stretching band at 3300 cm−1 in Li3PO4 (LiOH + H3PO4), LiCl (LiOH + HCl), and NaCl (NaOH + HCl) solutions based on cation (Li+ and Na+) molarity. (g–i) Linear regression analysis function graphs of absorbance based on the cation molarity in (d–f).
