Table 4 Fitting types and parameters of the probability distribution of different HM sources.

From: Human health-risk assessment of heavy metal–contaminated soil based on Monte Carlo simulation

Elements

Factor 1

Factor 2

Factor 3

Factor 4

Zn

S-T (8.85,1.11,)

S-T (14.39,1.80)

S-T (6.64,0.83)

S-T (25.46,3.18)

Cu

I (2.37,0.38)

I (5.01,0.8)

I (7.65,1.22)

I (9.76,1.55)

Cr

–

I (4.07,0.63)

I (11.11,1.73)

I (21.85,3.40)

Pb

M (38.81,8.91)

M (5.56,1.3)

M (111.29,2.59)

M (15.53,3.57)

Hg

–

I (0.00,0.00)

I (0.02,0.00)

I (0.01,0.00)

  1. (a1, a2) in S-T defines the midpoint and scale of the student distribution, (b1, b2) in I defines the mean and scale of the logical distribution, and (c1, c2) in M defines the most likely value and scale of the maximum extreme value distribution.
Back to article page