Badania toksycznosci produktow degradacji poliestru Bionolle

Abstract

The toxicity of the products of hydrolysis and biodegradation of "Bionolle®" polyester, carried out with use of filamentous fungi Aspergillus niger and Penicillinum funiculosum, on Chlorella sp., Lemna minor, Brassica rapa, Daphnia magna or Allium cepa was investigated. It was found that the products of hydrolytic degradation did not show toxic influence on the organisms tested while the solutions obtained after "Bionolle®" biodegradation inhibited the growth of Chlorella sp., Lemna minor and Brassica rapa, caused the mortality of Daphnia magna (Fig. 1), however, they did not cause the clastogenic effect on Allium cepa (Fig. 2). On the basis of the values of toxicity indices determined (IC50, NOEC and LC50) one can foresee that the products of polyester biodegradation, scattered in the environment, will not affect negatively the organisms living there (Table 2). Additionally it was found that the weight loss and TOC (total content of organic carbon) values of the samples in the solvent after hydrolysis are much lower than in similar solvents after biodegradation (Table 1).