Table 3.

% Success rate in classification for individual indices.

% success rate in classification	Cf	Igeo	Eir
Cu	19	48	87
Pb	7	23	84
Ni	74	58	100
Co	34	59	100
Mn	53	61	100
As	0	1	21
Cd	58	85	58
Sb	18	24	55
Cr	89	100	52

Classification accuracy was lower for complex indices such as the modified contamination degree (mCd) and Nemerov index (Pn), with 15.75% and 2.45%, respectively.