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. Author manuscript; available in PMC: 2010 Sep 1.
Published in final edited form as: Chemosphere. 2009 Jun 4;77(1):140–147. doi: 10.1016/j.chemosphere.2009.04.068

Table 1.

Average concentration (mg kg-1) of metals in mine tailings from Nacozari, Sonora, México.

Mine tailings Efflorescence salts
Number of analyzed samples 70 bulk 7
pH 3.87± 0.3 4± 0.2
EC μS/cm 340.1 ± 2 n.a.
Ti 1508 ± 365 <150
Cr <25 219.3 ± 68.6
Mn 158.5 ± 10.5 31084 ± 458
Fe 31739 ± 381.9 9298 ± 230
Ni 69.5 ± 15.5 204 ± 34.7
Cu 400.5 ± 15.8 68751 ± 865
Zn 78.8 ± 6.5 17858 ± 238.5
As 29.3 ± 4 23.8 ± 5
Se 5.9 ± 1.6 13.5 ± 1.8
Rb 298.4 ± 5.6 175 ± 5.5
Sr 68.6 ± 2.6 8 ± 3
Zr 49.8 ± 3.7 <6
Mo 58.3 ± 3.5 10.8 ± 4
Ag 47.9 ± 2.3 321 ± 16
Ba 423.1 ± 140 1671 ± 139
Hg 28.1 ± 2.8 <11
Pb 39 ± 4.2 12 ± 5
Cd <40 <40
Sn <80 <80
Tl <15 <15