Toxic Metal	Mean $C_{s}^{i}$	$C_{n}^{i}$	$C_{f}^{i}$	$T_{r}^{i}$	$E_{r}^{i}$	Risk Grade
As	0.00045	13	3.46 × 10⁻⁰⁵	10	3.46 × 10⁻⁰⁴	Slight
Cd	−0.00105	0.3	−3.50 × 10⁻⁰³	30	−1.05 × 10⁻⁰¹	Slight
Cr	−0.2459	90	−2.73 × 10⁻⁰³	2	−5.46 × 10⁻⁰³	Slight
Cu	0.0007	45	1.56 × 10⁻⁰⁵	5	7.78 × 10⁻⁰⁵	Slight
Hg	−0.4376	0.4	−1.09	40	−4.38 × 10⁺⁰¹	Slight
Ni	0.0141	68	2.07 × 10⁻⁰⁴	6	1.24 × 10⁻⁰³	Slight
Pb	0.0993	20	4.97 × 10⁻⁰³	5	2.48 × 10⁻⁰²	Slight
Zn	0.01055	95	1.11 × 10⁻⁰⁴	1	1.11 × 10⁻⁰⁴	Slight