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Table 5 Contamination factors (CF) and modified contamination degree (mCd) of heavy metals in water samples

From: Effects of columbite/tantalite (COLTAN) mining activities on water quality in Edege-Mbeki mining district of Nasarawa state, North Central Nigeria

Location/site Source Contamination factor (CF) mCd
Ni Mn Pb Cd Fe
Edege-Mbeki Well 0.4 0.218 32.4 9.67 0.84 8.71
Mining pond 5.1 0.248 35.8 8.33 6.99 11.29
Mararaban-Edege (control) Well 1.6 0.24 12.2 13 0.61 5.53