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

Table 1

Classification of pollution intensity as proposed by Müller [9].

	Class	Pollution intensity
<0	0	Unpolluted
0-1	1	Unpolluted to moderately polluted
1-2	2	Moderately polluted
2-3	3	Moderately to heavily polluted
3-4	4	Heavily polluted
5-6	5	Heavily to extremely polluted
>6	6	Extremely polluted