Radical change of Zn speciation in pig slurry amended soil: Key role of nano-sized sulfide particles

Formentini Thiago Augusto, Legros Samuel, Fernandes Cristovão Vicente Scapulatempo, Pinheiro Adilson, Le Bars Maureen, Levard Clément, Mallmann Fábio Joel Kochem, Da Veiga Milton, Doelsch Emmanuel. 2017. Radical change of Zn speciation in pig slurry amended soil: Key role of nano-sized sulfide particles. Environmental Pollution, 222 : 495-503.

Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Spreading livestock manure as fertilizer on farmlands is a widespread practice. It represents the major source of heavy metal(loid)s (HM) input in agricultural soils. Since zinc (Zn) is present at high concentrations in manure, it poses special environmental concerns related to phytotoxicity, groundwater contamination, and introduction in the food chain. Therefore, investigations on the fate and behavior of manure-borne Zn, when it enters the soil environment, are necessary to predict the environmental effects. Nevertheless, long-term field studies assessing Zn speciation in the organic waste matrix, as well as within the soil after manure application, are lacking. This study was designed to fill this gap. Using SEM-EDS and XAS analysis, we reported the following new results: (i) ZnS made up 100% of the Zn speciation in the pig slurry (the highest proportion of ZnS ever observed in organic waste); and (ii) ZnS aggregates were about 1-μm diameter (the smallest particle size ever reported in pig slurry). Moreover, the pig slurry containing ZnS was spread on the soil over an 11-year period, totaling 22 applications, and the resulting Zn speciation within the amended soil was analyzed. Surprisingly, ZnS, i.e. the only species responsible for a nearly 2-fold increase in the Zn concentration within the amended soil, was not detected in this soil. Based on SEM-EDS and XAS observations, we put forward the hypothesis that Zn in the pig slurry consisted of nano-sized ZnS crystallites that further aggregated. The low stability of ZnS nanoparticles within oxic and complex environments such as the studied soil was the key explanation for the radical change in pig slurry-borne Zn speciation after long-term amendments.

Mots-clés Agrovoc : lisier, porcin, déchet organique, métal lourd, engrais organique, amendement du sol

Mots-clés géographiques Agrovoc : France

Classification Agris : P02 - Pollution
F04 - Fertilisation
Q70 - Traitement des déchets agricoles
P33 - Chimie et physique du sol
L01 - Élevage - Considérations générales

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Formentini Thiago Augusto, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Legros Samuel, CIRAD-PERSYST-UPR Recyclage et risque (SEN)
• Fernandes Cristovão Vicente Scapulatempo, UFPR (BRA)
• Pinheiro Adilson, Regional University of Blumenau (BRA)
• Le Bars Maureen, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Levard Clément, Université d'Aix-Marseille (FRA)
• Mallmann Fábio Joel Kochem, CAPES [Coordenação de Aperfeiçoamento de Pessoal de Nível Superior] (BRA)
• Da Veiga Milton, UNOESC (BRA)
• Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296

Source : Cirad-Agritrop (https://agritrop.cirad.fr/583505/)

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