Non-extractable residues from environmental relevant chemicals - state of the art and developments

   Prof. Matthias Kästner

Helmholtz-Centre for Environmental Research, Germany

Abstract: Many pesticides are degradable by bacteria and fungi. However, some transformation products remain in soil. For approval, the fate of the compounds needs to be assessed in test procedures that enable the determination of extractable or non-extractable residues (NER) by using istope tracer compounds, usually ¹⁴C labelled ones.Results with ¹³C labelled pesticides show that easily degradable compounds are mineralized and converted to microbial biomass. After cell death, microbial necromass is a major constituent of the NER without toxic potential.Therefore, NER from parent compounds or primary metabolites should be assessed for toxic potentials whereas biogenic residues from biomass can be neglected.

Host：Prof. Cheng Gu

            Executive Editor

            Nanjing University

Time：3:00pm July 15, 2022 (Beijing time)

Zoom ID: 816 9975 7155

Bilibili: 25002335