Trace Metal Contamination Characteristics and Health Risks Assessment of Commelina africana L. and Psammitic Sandflats in the Niger Delta, Nigeria

Table 4

Comparison of pollution indices (PIs) of trace metals in sandflat soils of Douglas Creek and other studies.

	Cd	Cr	Ni	Pb	Zn			NIPI
Mean	0.76	7.39	2.28	0.02	74.51
Target value	0.8	100	35	85	140
This study	0.95	0.074	0.065	0.0003	0.53	0.32	0.95	0.71
Odewande and Abimbola [76]	0.2	0.6	0.5	0.6	0.7	0.5	0.9	0.7

Dutch soil guidelines [42].