A critical comparison of respirometric biodegradation tests based on OECD 301 and related test methods.
Biodegradation studies of organic compounds in the aquatic environment gain important information for the final fate of chemicals in the environment. A decisive role play tests for ready biodegradability (OECD 301) and in this context, the respirometric test (OECD 301F). Two different respirometric systems (Oxitop and Sapromat) were compared and in two of ten cases (diethylene glycol and 2-ethylhexylacrylate) differences were observed indicating that the test systems are not always equivalent. For 2-ethylhexylacrylate and cyclohexanone we could not state differences in the extent of biodegradation with a municipal and industrial inoculum whereas for cyclohexanone the degradation rate was faster with a municipal inoculum. Allylthiourea (ATU) proved to be an effective inhibitor of nitrification processes and did not affect the heterotrophic biodegradation activity. Modelling of biodegradation processes could be successfully performed with a first-order and a modified logistic plot.
Reuschenbach
Peter
P
BASF Aktiengesellschaft, Laboratory of Ecological Studies GV/TC Z570, D-67056 Ludwigshafen, Germany.
Pagga
Udo
U
Strotmann
Uwe
U
D001673:Biodegradation, Environmental; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis*; D008962:Models, Theoretical; D015203:Reproducibility of Results; D014867:Water; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification
D014874:Water Pollutants, Chemical; D014867:Water; D002245:Carbon Dioxide