A new leaching test on comminuted (0.125-2.0 mm gradation) cementitious matrices, designated as Modified-Pore Water (M-PW) test, was developed to evaluate the effect of varying leachate pH (4-12.8) and/or liquid-to-solid, LIS, ratio (0.6-50 dm(3)/kg) on the availability factor, F-AV, of heavy metals. The M-PW test was applied to leaching of lead and zinc ions from ground Portland cement mortar incorporating Municipal Solid Waste Incinerator (MSWI) fly ash. Correlation of M-PW test results (F-AV-L/S data) allowed the determination of the pore-liquid availability factor. F-AVP, at different leachate pHs. These F-AVP values were utilized, in conjunction with a kinetic pseudo-diffusional model, to evaluate the leaching behavior of monolithic mortar specimens subjected to dynamic leaching tests (constant leachant pH 4 or 6). A good agreement was found between the effective diffusion coefficients, D-e, of lead and zinc ions calculated by such a methodological approach and those obtained from recognized microstructural models. In contrast, no satisfactory agreement was found when these D-e values were compared with the ones calculated from the results of other availability tests on granular solid samples (MEN 7341 and AAT tests). (C) 2012 Elsevier B.V. All rights reserved.

Evaluation of the leachability of heavy metals from cement-based materials / Marcello, Dell'Orso; Mangialardi, Teresa; Paolini, Antonio Evangelista; Piga, Luigi. - In: JOURNAL OF HAZARDOUS MATERIALS. - ISSN 0304-3894. - 227-228:(2012), pp. 1-8. [10.1016/j.jhazmat.2012.04.017]

Evaluation of the leachability of heavy metals from cement-based materials

MANGIALARDI, Teresa;PAOLINI, Antonio Evangelista;PIGA, LUIGI
2012

Abstract

A new leaching test on comminuted (0.125-2.0 mm gradation) cementitious matrices, designated as Modified-Pore Water (M-PW) test, was developed to evaluate the effect of varying leachate pH (4-12.8) and/or liquid-to-solid, LIS, ratio (0.6-50 dm(3)/kg) on the availability factor, F-AV, of heavy metals. The M-PW test was applied to leaching of lead and zinc ions from ground Portland cement mortar incorporating Municipal Solid Waste Incinerator (MSWI) fly ash. Correlation of M-PW test results (F-AV-L/S data) allowed the determination of the pore-liquid availability factor. F-AVP, at different leachate pHs. These F-AVP values were utilized, in conjunction with a kinetic pseudo-diffusional model, to evaluate the leaching behavior of monolithic mortar specimens subjected to dynamic leaching tests (constant leachant pH 4 or 6). A good agreement was found between the effective diffusion coefficients, D-e, of lead and zinc ions calculated by such a methodological approach and those obtained from recognized microstructural models. In contrast, no satisfactory agreement was found when these D-e values were compared with the ones calculated from the results of other availability tests on granular solid samples (MEN 7341 and AAT tests). (C) 2012 Elsevier B.V. All rights reserved.
2012
m-pw leaching test; heavy metals; effective diffusion coefficient; potential leachability; availability test
01 Pubblicazione su rivista::01a Articolo in rivista
Evaluation of the leachability of heavy metals from cement-based materials / Marcello, Dell'Orso; Mangialardi, Teresa; Paolini, Antonio Evangelista; Piga, Luigi. - In: JOURNAL OF HAZARDOUS MATERIALS. - ISSN 0304-3894. - 227-228:(2012), pp. 1-8. [10.1016/j.jhazmat.2012.04.017]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/434779
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