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

Table 2

Mean values and standard errors of heavy metal concentrations in soils and sediments from the La Zacatecana Lagoon. Sites denoted by different letters in the same column differ significantly at in one-way ANOVA, according to Tukey’s post hoc analysis. Metal concentrations are expressed as mg·kg⁻¹.

Sampling site	Pb	As	Hg	Cd	Cr	Ni
I	94 ± 4 e	30 ± 0.9 cd	38 ± 2.9 abc	16 ± 0.02 b	74 ± 2.4 a	76 ± 1.6 a
II	162 ± 42 de	27 ± 1 de	41 ± 11 bc	ND	19 ± 0.9 efg	19.9 ± 1.0 d
III	121 ± 2.7 de	21. ± 1.4 efg	15 ± 4.8 bcd	ND	32 ± 0.7 d	23 ± 1.2 d
IV	72 ± 1.8 e	19 ± 0.8 fg	18 ± 4.3 bcd	21 ± 0.1 a	64 ± 0.4 b	60 ± 0.7 b
V	60 ± 9.4 e	17 ± 1.3 g	12 ± 6.3 cd	ND	18 ± 0.9 efg	15 ± 0.5 e
VI	48 ± 4.8 e	16 ± 2.1 gh	7.9 ± 4 d	ND	22 ± 0.6 efg	9 ± 0.1 fg
VII	29 ± 1.2 e	9.3 ± 1.1 h	7.7 ± 1.3 d	ND	19 ± 0.6 efg	9 ± 0.2 fg
VIII	3070 ± 20 a	28 ± 1.4 cde	10 ± 0.3 cd	ND	17 ± 1.4 efg	6 ± 0.2 g
IX	545 ± 44 c	35 ± 1.2 c	47 ± 11 a	ND	17 ± 1.0 fg	10 ± 0.3 ef
X	742 ± 62 b	80 ± 1.4 b	47 ± 8.2 a	ND	15 ± 1.4 g	14 ± 0.5 e
XI	88 ± 3 e	18 ± 0.4 g	9 ± 0.1 d	ND	25 ± 1 def	24 ± 0.5 d
XII	760 ± 71 b	101 ± 2.8 a	24 ± 0.2 abcd	8 ± 0.1 c	67 ± 3.6 ab	74 ± 1.4 a
XIII	87 ± 6.3 e	17 ± 0.8 g	8 ± 0.1 d	ND	25 ± 0.7 de	22 ± 0.2 d
XIV	280 ± 31 d	26 ± 1.3 de	12 ± 0.3 cd	ND	44 ± 0.9 c	42 ± 0.7 c

ND = nondetected.