Table 4.

ζ potential results of carbon black samples.

Sample	ζ Potential (mV)
	Mean	±	SD
CB	−23.88	±	1.20	A
CB.H2SO4	−23.75	±	2.15	A
CB.KOH	−37.35	±	1.42
CB.H2SO4 + KOH	−46.94	±	1.90

Mean values with the same letter are not statistically different (Tukey’s honestly significant difference (HSD), p-value > 0.05).