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Characterization and selection of biochar for an efficient retention of tricyclazole in a flooded alluvial paddy soil

Manuel Garcia-Jaramillo, Lucia Cox, Heike E. Knicker, Juan Cornejo, Kurt A Spokas, M. Carmen Hermosin
Journal of hazardous materials 2014 v.286 pp. 581-588
Fourier transform infrared spectroscopy, absorbents, alluvial soils, biochar, composts, correlation, dissolved organic matter, elemental composition, feedstocks, flooded conditions, nuclear magnetic resonance spectroscopy, organic compounds, pH, paddy soils, pesticide application, pesticide persistence, pesticide residues, pyrolysis, scanning electron microscopes, scanning electron microscopy, soil amendments, sorption, surface area, temperature, tricyclazole
Biochars, produced from different organic residues, are increasingly proposed as soil amendment for their agronomic and environmental benefits. Nevertheless, a systematic detection method that relates correlates the biochar properties of these biochars to their ability to adsorb organic compounds is still lacking. In this study, seven biochars obtained after pyrolysis at different temperatures and from different feedstock were characterized and tested to reveal sustainable potential formsremedial forms of for pesticide application capture in flooded soils. Their Biochar properties were determined by nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, specific surface area (SSA) determination, scanning electron microscope (SEM) examination and elemental composition. In addition, dissolved organic matter (DOM) from these biochars was extracted and quantified in order to evaluate the effect on pesticide sorption. The biochars used presented high affinity to the fungicide tricyclazole and this affinity was positively correlated with the pyrolysis temperature, the pH, the increased SSA of the biochars, and with the enhanced aromaticity. On the other hand, their sorptive capacities were negatively related to DOM production. The results also show that the amendment with a mixture of compost and biochar endows the alluvial soil with high sorptive properties without impeding the slow release of tricyclazole, increasing its efficiency under flooded conditions.