Description: Das Projekt "Biogenic formation of non-extractable residues from pesticides in soil" wird vom Umweltbundesamt gefördert und von Helmholtz-Zentrum für Umweltforschung GmbH - UFZ, Department Umweltbiotechnologie durchgeführt. During microbial turnover of organic chemicals in soil, non-extractable residues (NER) are formed frequently. Studies on NER formation usually performed with radioisotope labelled tracer compounds are limited to localisation and quantitative analyses but their chemical composition is left unknown. Recently, we could show for 2,4-dichlorophenoxyacetic acid and ibuprofen that during microbial turnover in soil nearly all NER were derived from microbial biomass, since degrading bacteria use the pollutant carbon for their biomass synthesis. Their cell debris is subsequently stabilised within soil organic matter (SOM) forming biogenic NER (bioNER). It is still unknown whether bioNER are also formed during biodegradation of other, structurally different compound classes of organic contaminants. Therefore, agricultural soil will be incubated with labelled compounds of five classes of commonly used and emerging pesticides: organophosphate, phenylurea, triazinone, benzothiadiazine and aryloxyphenoxypropionic acid. The fate of the label will be monitored in both living and non-living SOM pools and the formation of bioNER will be quantified for each compound over extended periods of time. In addition, soil samples from long-term lysimeter studies with 14C-labelled pesticide residues (e.g. triazine, benzothiazole and phenoxypropionic acid group) will be also analysed for bioNER formation. The results will be summarised to identify the metabolic conditions of microorganisms needed for bioNER formation and to develop an extended concept of risk assessment including bioNER formation in soils.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Phenylharnstoff ? Schädlingsbekämpfungsmittel ? Benzothiazol ? Messgerät ? Triazin ? Bodenkohlenstoff ? Pestizid ? Humus ? Organische Phosphorverbindung ? Tracer ? Bodenkunde ? Bodenmikroorganismen ? Chemische Zusammensetzung ? Lysimetrie ? Pflanzenschutzmittelrückstand ? Radionuklid ? Teich ? Widerspruchsverfahren ? Bakterien ? Organische Verbindung ? Ackerboden ? Gelöster organischer Kohlenstoff ? Pestizidrückstand ? Bodenprobe ? Organischer Schadstoff ? Studie ? Synthese ? Umweltforschung ? Widerrufsvorbehalt ? Biologischer Abbau ? Zelle ? Abfall ? Mikroorganismen ? Säure ? Boden ? Bewertung ? Bodenschadstoff ? Bodenbildung ? Bildung ? Landwirtschaft ? Risiko ? Rückstand ? Bedarf ? Schadstoff ? Biomasse ? Risikobewertung ? ZEITRAEUME ? GRUPPE ? EINGESCHRAENKT ? VERBLEIB ? VERHAELTNIS ? NEU ? Ortsbestimmung ? DAUER ? EINSATZ ? ERGEBNIS ? SONSTIG ? VERBINDUNG ? ZEICHEN ? FORMBLAETTER ?
Region: Sachsen
Bounding box: 10.40664° .. 10.40664° x 49.29433° .. 49.29433°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2012-01-01 - 2024-11-29
Accessed 1 times.