Zinc mobility from polluted and treated soils with pillared materials due to rain water [articol]

Abstract

Water acidity due to precipitation can fixe from zinc polluted soil an important quantity of metal, who are taken and stored by plants tissue. Using some immobilization agents in-situ represents a remediation technique for polluted soil, for reducing of zinc ions bioavailability. Using of some pillared materials obtained by polynuclear aluminum salts (R = molar ratio OH/Al = 2.3) settled onto natural zeolite with about 70% clinoptilolite, had as effect the reduction of Zn ions mobility, in contact with rains water. Pillared materials used, like tuf-Aln action synergic for reducing the metal mobility, in respect with the tuf components and high polymer Aln salts, at soil impact with percolated water with pH range in 5.4 – 6.5. Decreasing effects of zinc dissolution are 10-40 times higher in presence of pillared material than others used in this study, in the case of percolation with rains waters, pH between 5.4 ÷ 6.5.