Kinetics of Aerobic Polymer Degradation in Soil by Means of the ASTM D 5988-96 Standard Method |
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Authors: | Alberto Modelli Barbara Calcagno Mariastella Scandola |
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Institution: | (1) Università di Bologna, Dipartimento di Chimica G. Ciamician,, via Selmi 2, 40126 Bologna, Italy;(2) Università di Bologna, Corso di Laurea in Scienze Ambientali, piazza Kennedy 12, 48100 Ravenna, Italy |
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Abstract: | The standard test method ASTM D 5988-96 for determining the degree and rate of aerobic biodegradation of plastic materials in contact with soil was applied to poly(3-hydroxybutyrate) and poly(-caprolactone). The method proved to be reliable and supplied reproducible measurements of CO2 production, provided potassium (instead of barium) hydroxide was used as a trapping solution. The trends of CO2 evolution, as a function of time, observed for the degradation of polymer powders in soil are similar to those predicted by simple first order kinetics in solution. The experimental data are described by a Michaelis–Menten type model, which accounts for the heterogeneity of the polymer-soil system. The kinetic equation deduced predicts the degradation rate to the proportional to the exposed polymer surface area. |
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Keywords: | Kinetics aerobic biodegradation poly-3-hydroxybutyrate poly--caprolactone" target="_blank">gif" alt="epsiv" align="BASELINE" BORDER="0">-caprolactone ASTM D 5988-96 |
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