Levels and Health Risk Assessment of Heavy Metals in Soil, Water, and Vegetables of Dar es Salaam, Tanzania

Table 2

Observed mean (± standard deviation) of heavy metal levels in water and soil ( = 6).

	Pb	Zn	Cu	Fe
Water (mg/l)
Observed	0.5 (0.00)	0.8 (0.04)	0.1 (0.00)	1.1 (0.01)
Standard	0.01	5	2	0.3
Soil (mg/100 g dry soil)
Observed	227.4 (2.9)	307.1 (1.2)	17.8 (2.3)	2796.6 (36.5)
Standard	1.0–7.0	5.0–10.0	0.6–6.0	15.0

FAO/WHO codex general standards for contaminants and toxins in foods (1996); WHO and Encyclopedia of Environmental Science; WHO (2000).