Table 2. Experimental Protonation Constant Values of DMSA in NaCl at I = 0.15 mol L^–1.

	log βa
reaction	288.15 K	298.15 K	310.15 K	318.15 K
H+ + L4– = HL3–	10.96 ± 0.02	11.01 ± 0.04	11.27 ± 0.02	11.32 ± 0.03
2H+ + L4– = H2L2–	20.15 ± 0.03	20.32 ± 0.03	20.64 ± 0.02	20.82 ± 0.03
3H+ + L4– = H3L–	23.51 ± 0.05	23.87 ± 0.02	24.35 ± 0.02	24.61 ± 0.02
4H+ + L4– = H4L0	26.14 ± 0.04	26.39 ± 0.03	26.85 ± 0.02	27.09 ± 0.02

^a±standard deviation.