Assessment of Ecological Risk of Heavy Metals Using Probabilistic Risk Assessment Model (AQUARISK) in Surface Sediments from Wami Estuary, Tanzania

Table 1

Experimental values (mg kg^-1) of As, Cd, Cr, Cu, Pb, Zn, and Fe compared with certified values in IAEA–SOIL–7 (trace elements in soil).

Element	Recommended value (mg kg^-1)	95% confidence interval (mg kg^-1)	Experimental value (mg kg^-1)
As	13.4	12.5–14.2
Cd	1.3	1.1–2.7
Cr	60	49–74
Cu	11	9–13
Pb	60	55–71
Zn	104	101–113
Fe	25700	25200–26300