The mean percentage proportion of metals (%) in the non-lithogenous and lithogenous fractions (Contd.)

Table 3b: The mean percentage proportion of metals (%) in the non-lithogenous and lithogenous fractions (Contd.)

Locations	Ni		Mn		Fe
	Non-lithogenous fraction^a	Lithogenous fraction^b	Non-lithogenous fraction^a	Lithogenous fraction^b	Non-lithogenous fraction^a	Lithogenous fraction^b
Odo Owa 2	76.83	23.17	68.42	31.58	56.49	43.51
Odo Owa 5	96.9	3.1	56.14	43.86	67.72	32.28
Oke-Asa 1	85.55	14.45	58.54	41.46	64.95	35.05
Ijero/Ipoti	84.48	15.52	59.26	40.74	74.6	25.4
Ipoti 3	88.06	11.94	77.27	22.73	61.32	38.68
Soso	80.71	19.29	72.73	27.27	42.26	57.74
Lawrence 1	93.23	6.77	67.44	32.56	54.46	45.54
Lawrence 2	85.29	14.71	58.14	41.86	63.44	36.56
Erigbe	86.78	13.22	61.9	38.1	69.36	30.64
Arapate	95.24	4.76	50	50	68.99	31.01
Mean	87.31	12.69	62.98	37.02	62.36	37.64
St dev.	6.3	6.3	8.3	8.31	9.3	9.3

Non-lithogenous fraction^a = aqueous phase + exchangeable phase + inorganic phase + organic phase; Lithogenous fraction^b = Residual.