Effects of organic amendments on the mobility of Pb and Zn from mine tailings added to semi-arid soils.
The effects of mine tailings and three organic amendments (compost, bokashi and vermicompost) on the mobility factor for Pb and Zn and on the potential C and N mineralization in semi-arid agricultural and rangeland soils were examined. During the experiment, soil samples were analyzed periodically for CO(2)-C evolution, inorganic N, dehydrogenase activity and percent Pb and Zn mobility during 169 d of incubation. The dehydrogenase activity and CO(2)-C evolved were strongly inhibited by mine tailings mixed with organic compost in both agricultural and rangeland soils (37 to 43 %), followed by N mineralization in treatments with mine tailings plus bokashi or compost (13 to 26.5 %) at 169 d incubation. The highest % mobility of Pb and Zn were observed in soils amended with mine tailings alone, while the lowest was observed in agricultural soils treated with vermicompost plus mine tailings. The CO(2)-C evolved was fitted to first order E, while the cumulative N mineralization was fitted to the linearized power function. Mine tailings were found to influence the potential C and N mineralization rate constants in both soils. The models for C and N mineralization could be used to evaluate the effects of mine tailings, which include intrinsic parameters in the soil.
Department of Biotechnology and Bioengineering, CINVESTAV- IPN, San Pedro Zacatenco C.P. México, D.F., México. mbarajas@cinvestav.mx
M
M
Barajas-Aceves
R
R
Rodríguez-Vázquez
D000383:Agriculture; D004784:Environmental Monitoring; D007220:Industrial Waste / Q000032:analysis*; D007854:Lead / Q000737:chemistry*; D008906:Mining; D012037:Refuse Disposal; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
D007220:Industrial Waste; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D015032:Zinc