Spatial Variability of Heavy Metals in Soils and Sediments of “La Zacatecana” Lagoon, Mexico

Table 5

Geoaccumulation Index (I_geo) values of heavy metals of soils and sediments from the different sampling sites of the La Zacatecana Lagoon.

Site sampling	Igeo
	Pb	As	Hg	Cd	Cr	Ni
I	2.3	2.9	1.6	3.6	−0.6	0.3
II	3.1	2.7	1.8	ND	−2.5	−1.6
III	2.6	2.4	0.3	ND	−1.8	−1.4
IV	1.9	2.3	0.6	3.9	−0.8	0
V	1.6	2.1	0.03	ND	−2.6	−2
VI	1.3	2.0	−0.6	ND	−2.3	−2.7
VII	0.6	1.2	−0.7	ND	−2.5	−2.7
VIII	7.3	2.8	−0.3	ND	−2.7	−3.4
IX	4.8	3.1	1.9	ND	−2.7	−2.5
X	5.3	4.3	2.0	ND	−2.8	−2.1
XI	2.2	2.1	−0.4	ND	−2.2	−1.3
XII	5.3	4.7	1.0	2.6	−0.7	0.3
XIII	2.2	2.1	−0.6	ND	−2.1	−1.4
XIV	3.8	2.7	−0.01	ND	−1.3	−0.5

ND = notdetected.