Influence of heavy metals fraction on quality of composts

• M.E. Silva ^[1] ; I. Brás ^[1] ; A.C. Cunha-Queda ^[2] ; O.C. Nunes ^[3]
  1. [1] Instituto Politécnico de Viseu

     Instituto Politécnico de Viseu

     Viseu (São José), Portugal

     
  2. [2] Universidade de Lisboa

     Universidade de Lisboa

     Socorro, Portugal

     
  3. [3] Universidade Do Porto

     Universidade Do Porto

     Santo Ildefonso, Portugal

     

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• Localización: Wastes: solutions, treatments and opportunities III / Cândida Vilarinho (dir.), Fernando Castro (dir.), Margarida Gonçalves Neto (dir.), Ana Luísa Fernando (dir.), 2020, ISBN 9780367257774, págs. 293-300
• Idioma: inglés
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• Resumen

  • In this study the fractionation of the heavy metals in four commercial composts was assessed. The heavy metals mobility that most influenced the chemical composition of humic-like substances (HS-like) and the physicochemical, maturity and stability properties of the composts were identified. The heavy metals fractionation was performed following the modified sequential BCR (Community Bureau of Reference) extraction, which permitted to quantify the elemental concentration in the exchangeable/bioavailable, reducible, oxidisable and residual fractions. Cu, Ni, Cr and Pb were most abundant in the immobile phases, while Zn showed no dominant chemical phase. The HS-like chemical composition was influenced negatively by the residual fraction of Cu, Pb, and mainly Cr. The type or mobility of the heavy metals did not show any influence on composts maturity. However, mobile forms of Zn and Pb were correlated with high moisture content and low stability, respectively as well as with the increase of compost phytotoxicity.