Auflistung nach Autor:in "Atorf, Cornelia"

Gerade angezeigt 1 - 2 von 2
  • Vorschaubild nicht verfügbar
    Veröffentlichung
    Development of a test method for transformation of veterinary pharmaceuticals and biocides in anaerobic liquid manure
    (2020) Junker, Thomas; Atorf, Cornelia; Berkner, Silvia; Konradi, Sabine
    Background Spreading of manure on agricultural soils represents an important pathway by which veterinary medicinal and biocidal products enter the environment. To assess their environmental impact in the context of authorization processes, experimental testing of transformation of these compounds in manure is considered in regulatory guidance documents. However, there is no standardized experimental test method available so far. To fill this gap, an experimental test method was developed to examine transformation in liquid cattle and pig manure. Results To account for manure specifics and for a possible influence of manure parameters on transformation rates, a comprehensive data acquisition and statistical analysis were performed. To address the variability of liquid manure of different type and origin, 30 manures were sampled and characterized. Thereof, three cattle and three pig manures were selected to perform anaerobic transformation studies with two radiolabeled veterinary medicinal active substances (14C-salicylic acid and 14C-paracetamol) and a confidential radiolabeled "14C-biocide B" serving as test compounds. Spatial and seasonal variability of manure parameters was quantified, and a sampling technique to obtain homogenous manure samples was developed. Transformation studies with six replicates per sampling point were conducted to examine the influence of test setup, of manure storage conditions, and of parameter variations between manure of the same species and of different species on half-lives, formation of extractable and non-extractable residues and mineralization rates. Finally, a test design was established that yields reproducible results for transformation studies in liquid cattle and pig manure under anaerobic conditions. Conclusions Results give a reliable basis for an experimental test method to perform anaerobic transformation studies in liquid cattle and pig manure. The developed test method comprises detailed guidance on selection of sampling date and site, collection from manure tank, storage duration and temperature in the laboratory, duration of manure acclimation period, and the incubation system design. It proved to give reproducible results in a validation ring test performed in a follow-up project and is planned to be submitted as draft test guideline for approval by the OECD. © The Author(s) 2020.
  • Vorschaubild
    Veröffentlichung
    Development of a test protocol to study the transformation of veterinary pharmaceuticals and biocides in liquid manure
    (2015) Hennecke, Dieter; Atorf, Cornelia; Bickert, Claudia; Fraunhofer-Institut für Molekularbiologie und Angewandte Oekologie; Deutschland. Umweltbundesamt; Berkner, Silvia; Konradi, Sabine; Lehmann, Rene
    It was the aim of the project to develop a method to determine the transformation of substances in liquid manure. In a first step, the heterogeneity of manure of different type and origin was tested. Furthermore, a procedure was tested which is capable to take samples homogeneously from a manure storage tank. Obviously, representative sampling is possible in case mixing devices which are routinely applied by the farmers are used prior to sampling. In order to get an overview on the variability of liquid manure of different type and origin (pig-/cattle manure; manure sampled in summer and winter, from different regions and livestock breeding) 30 manures were sampled and characterized. Furthermore, temperature (including a temperature profile) in manure tanks was reported in order to select a realistic test temperature. Six manures were selected to perform transformation studies of two veterinary medicinal products (Salicylic acid, Paracetamol) and a biocide. The experimental methodology which was developed in the project was used in a first inter-laboratory comparison (ring test) with 5 laboratories. Experiences of the participants were presented and discussed on a workshop and based on the results the developed test protocol was adapted.