Classification and modelling of non-extractable residue (NER) formation from pesticides in soil

M. Kästner, K. M. Nowak, A. Miltner, Stefan Trapp, A. Schaeffer

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Abstract

This presentation provides a comprehensive overview about the formation of nonextractable residues (NER) from organic pesticides and contaminants in soil and tries classifying the different types. Anthropogenic organic chemicals are deliberately (e.g. pesticides) or unintentionally (e.g. polyaromatic hydrocarbons [PAH], chlorinated solvents,
pharmaceuticals) released in major amounts to nearly all compartments of the environment. Soils and sediments as complex matrices provide a wide variety of binding sites and are the major sinks for these compounds. Many of the xenobiotics entering soil undergo turnover processes and can be volatilised, leached to the groundwater, degraded by microorganisms or taken up and enriched by living organisms. Xenobiotic NER may be derived from parent compounds and primary metabolites that are sequestered (sorbed or entrapped) within the soil organic matter (type I) or can be covalently bound (type II). Both types may pose a considerably environmental risk of potential release. However, NER resulting from elevated biodegradation, which means the conversion of carbon (or nitrogen) from the compounds into microbial biomass molecules during microbial degradation (type III, bioNER), do not pose any risk. Experimental and analytical approaches to clearly distinguish between the types are provided and a model to prospectively estimate their fate in soil is proposed.
Original languageEnglish
Title of host publicationSETAC Europe 25th Annual Meeting : Abstract Book
Number of pages1
Place of PublicationBarcelona, Spain
PublisherSETAC
Publication date2015
Publication statusPublished - 2015
EventSETAC Europe 25th Annual Meeting - Barcelona, Spain
Duration: 3 May 20157 May 2015
Conference number: 25
http://barcelona.setac.eu/?contentid=767

Conference

ConferenceSETAC Europe 25th Annual Meeting
Number25
Country/TerritorySpain
CityBarcelona
Period03/05/201507/05/2015
Internet address

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