Table 4.

Geo-accumulation estimation (I_geo) for studied sample sources

Sample source	Potentially toxic elements (mg/kg)
	Cd	As	Pb	Hg	Zn
FS	− 1.6	− 0.8	− 4.0b	− 0.1	− 2.4
UrS	5.0a	4.8b	− 1.2	4.7	1.1
OxS	5.1a	4.7b	− 1.2	3.9c	0.7
AvS	3.2c	− 0.1	− 3.0	3.2c	− 2.2

^aVery high contamination

^bConsiderable contamination

^cModerate contamination