Table 2.

Chemical compounds of WWA from past studies.

SiO2	Al2O3	Fe2O3	CaO	MgO	K2O	NaO	L.O. I	Ref.
31.8	28	2.34	10.53	9.32	10.38	6.5	1.13	[66]
32.8	27.0	2.2	11.7	9.1	10.5	6.7	0.7	[61]
30.4	26.5	1.9	12.8	9.4	11.4	5.9	1.7	[67]
32.4	27.4	2.1	10.3	9.4	10.85	6.4	1.15	[68]
31.8	28.2	2.4	10.6	9.2	10.80	6.0	1.00	[69]
33.6	27.8	2.6	11.2	8.3	10.2	5.7	0.60	[70]
32.7	26.4	2.2	10.25	9.45	10.45	7.21	1.34	[71]
31.5	26.3	2.6	10.4	9.3	10.72	8.2	0.98	[72]