Reproducing the organic matter model of anthropogenic dark earth of Amazonia and testing the ecotoxicity of functionalized charcoal compounds

Autores

  • Carolina Rodrigues Linhares Universidade Federal Fluminense
  • Jasmin Lemke Embrapa Solos
  • Ruben Auccaise Embrapa Solos
  • Daniele Avilez Duó Universidade do Estado do Rio de Janeiro
  • Roberta Lourenço Ziolli Universidade Federal do Estado do Rio de Janeiro
  • Witold Kwapinski University of Limerick
  • Etelvino Henrique Novotny Embrapa Solos

DOI:

https://doi.org/10.1590/S1678-3921.pab2012.v47.10026

Palavras-chave:

Daphnia similis, “biochar”, oxidação química, fracionamento de substâncias húmicas, ressonância magnética nuclear, carbono pirogênico

Resumo

The objective of this work was to obtain organic compounds similar to the ones found in the organic matter of anthropogenic dark earth of Amazonia (ADE) using a chemical functionalization procedure on activated charcoal, as well as to determine their ecotoxicity. Based on the study of the organic matter from ADE, an organic model was proposed and an attempt to reproduce it was described. Activated charcoal was oxidized with the use of sodium hypochlorite at different concentrations. Nuclear magnetic resonance was performed to verify if the spectra of the obtained products were similar to the ones of humic acids from ADE. The similarity between spectra indicated that the obtained products were polycondensed aromatic structures with carboxyl groups: a soil amendment that can contribute to soil fertility and to its sustainable use. An ecotoxicological test with Daphnia similis was performed on the more soluble fraction (fulvic acids) of the produced soil amendment. Aryl chloride was formed during the synthesis of the organic compounds from activated charcoal functionalization and partially removed through a purification process. However, it is probable that some aryl chloride remained in the final product, since the ecotoxicological test indicated that the chemical functionalized soil amendment is moderately toxic.

Publicado

2012-06-15

Como Citar

Linhares, C. R., Lemke, J., Auccaise, R., Duó, D. A., Ziolli, R. L., Kwapinski, W., & Novotny, E. H. (2012). Reproducing the organic matter model of anthropogenic dark earth of Amazonia and testing the ecotoxicity of functionalized charcoal compounds. Pesquisa Agropecuária Brasileira, 47(5), 693–698. https://doi.org/10.1590/S1678-3921.pab2012.v47.10026