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Interaction of the water soluble fraction of MSW-composts with Pb(II) and Cu(II) ions

Castaldi, Paola and Demurtas, Daniela and Silvetti, Margherita and Deiana, Salvatore Andrea and Garau, Giovanni (2017) Interaction of the water soluble fraction of MSW-composts with Pb(II) and Cu(II) ions. Journal of Environmental Management, Vol. 192 , p. 39-47. ISSN 0301-4797. Article.

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DOI: 10.1016/j.jenvman.2017.01.032

Abstract

In this study we report on the interactions between the water-soluble fraction (WSF) of two municipal solid waste composts (C1- and C2-WSF) with Pb(II) and Cu(II) ions at pH 4.5. The Me(II) addition to the compost-WSFs led to the formation of soluble Me(II)-organic complexes (as highlighted by FT-IR spectroscopy), and to a decrease of the trace metals' solubility, which was greater for Pb(II) than Cu(II). This was due to the formation of insoluble Me(II) complexes involving the water-soluble organic carbon (WSOC) and the inorganic anions within both WSFs [1.10 and 0.62 mmol L−1 and 2.06 and 0.42 mmol L−1 of Pb(II) and Cu(II) precipitated from C1- and C2-WSF respectively, when 6.4 mmol L−1 Me(II) was added]. A loss of WSOC from both WSFs, i.e. ∼13% and <5%, was detected in the systems containing 6.4 mmol L−1 Pb(II) and Cu(II) respectively. A significant contribution in the formation of Pb(II) precipitates was also due to phosphate, chloride and sulphate anions, since their concentrations in the WSF decreased of 80, 25 and 90%, respectively, after the addition of 6.4 mmol L−1 Pb(II). A decrease of phosphate anions in both WSFs (∼30%) was found in the systems containing Cu(II).

Item Type:Article
ID Code:11571
Status:Published
Refereed:Yes
Uncontrolled Keywords:Compost water-soluble fraction, Pb(II) and Cu(II), water-soluble organic carbon, water-soluble inorganic anions
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0301-4797
Deposited On:10 Apr 2017 18:06

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