Characterization of Metakaolin from Wassa Kaolin and Its Potential as Adsorbent for the Regeneration of Used Engine Lubrication Oil

Table 3

Chemical properties of oil samples.

Sample	Metallic content (ppm)				Total acid no. (MgKOH/g)
	Cr^2+	Cu^2+	Zn^2+	Fe^2+
Used lubricant engine oil	0.0067	0.0021	0.0056	0.0083	10.3138
Metakaolin lubricant oil	0.0050	0.0014	0.0028	0.0072	4.2041
Virgin lubricant oil	0.0042	0.0013	0.0527	0.0057	5.1987