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

Table 5

AQUARISK estimates of the hazardous concentrations of metals in sediments (ngg^-1) likely to affect up to 5, 10, or 25% of species (at 50% and 95% confidence limit).

Element	Hazardous concentrations of metals in sediments likely to affect up to 5, 10 or 25% of species
	HC5, 50	HC5, 95	HC10, 50	HC10, 95	HC25, 50	HC25, 95
As	3070	853.00	4660	2300	10900	4790
Cd	1.72	0.19	2.91	1.35	8.14	4.11
Cr	1.60	0.96	21.3	15.9	576	39.80
Cu	4.88	1.96	7.73	4.03	18.70	9.85
Pb	43.40	1.18	86.2	40.70	352.00	94.00
Zn	22.20	15.7	45.3	36.80	149.00	12.60