Evaluation of surface water quality indices and ecological risk assessment for heavy metals in scrap yard neighbourhood

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Table 3 The results of heavy metals concentration of the sample water vis-à-vis the regulatory standards limits of World Health Organization and Standard Organization of Nigeria (World Health Organization 2006, 2008)

Sample code	Zn (mg/L) WHO 3 mg/L SON 3 mg/L	Cu (mg/L) WHO 1 mg/L SON 1 mg/L	Cd (mg/L) WHO 0.003 mg/L SON 0.003 mg/L	Pb (mg/L) WHO 0.01 mg/L SON 0.01 mg/L	Ni (mg/L) WHO 0.02 mg/L SON 0.02 mg/L
ODS-1	0.0748	ND	0.0193	0.0188	ND
ODS-2	0.0713	ND	0.0147	ND	ND
ODS-3	0.1615	ND	0.0139	ND	ND
ODS-4	0.0790	ND	0.0147	ND	ND
ODS-5	0.0778	ND	0.0131	0.0459	ND
ODS-6	0.1258	ND	0.0086	ND	ND
ODS-7	0.0899	ND	0.0064	ND	ND
ODS-8	0.0479	ND	0.0100	ND	ND
ODS-9	0.0532	ND	0.0051	ND	ND
ODS-10	0.0470	ND	0.0110	ND	ND
LFS-1	0.0762	ND	0.0014	ND	ND
LFS-2	0.0962	ND	0.0193	ND	ND
LFS-3	0.7204	0.0341	0.0147	ND	ND
LFS-4	0.7781	ND	0.0139	ND	ND
LFS-5	0.7239	ND	0.0147	ND	ND