Registration Dossier
Registration Dossier
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EC number: 941-364-9 | CAS number: -
Endpoint summary
Administrative data
Description of key information
The ready biodegradability of the test item Petroleum gas oil fraction, co-processed with renewable hydrocarbons of plant and/or animal origin (EC 941-364-9) was determined with non-adapted activated sludge in the Manometric Respirometry Test for a period of 28 days. The study was conducted according to OECD guideline 301F and in compliance with GLP.
The test item concentration selected as appropriate was 17.5 mg/L, corresponding to a ThOD of 50.5 mg O2/L per test vessel. The test item was once applied via a stock solution in silicone oil and second without silicone oil.
The 1st and 2nd test item replicate without silicone oil reached the 10 % level (beginning of biodegradation) within 3 days. The 60% threshold was not reached within 28 days. The mean biodegradation on day 28 was 39% in the test item replicates without silicone oil. The 1st and 2nd test item replicate with silicone oil reached the 10 % level (beginning of biodegradation) on day 3. The 60% threshold was reached within 19 days. The mean biodegradation on day 28 was 69% in the test item replicates with silicone oil.
After a test period of 28 days, the test item was not readily biodegradable within the 28-day period of the study without silicone oil. After a test period of 28 days, the test item was readily biodegradable within the 28-day period of the study with silicone oil.
The predicted degradation half-lives in surface water, sediment and soil for constituents of this substance range between 1.02 and 166,000 days, 4.07 and 662,000 days, 1.02 and 166,000 days respectively.
QSAR predictions of half-lives of VHGO have also been provided to support the read-across from VHGO to registration substance.
Additional information
Read across substance diesel / gas oil fractions are not readily biodegradable but are considered inherently biodegradable. In a report on environmental classification (Concawe 2001), it was concluded that, based on the known properties of hydrocarbons in the range C9 to C26,diesel/gas oil fractions are not readily biodegradable, but are regarded as being inherently biodegradable, since they can be degraded by micro-organisms.
In a further investigation (Concawe 2012) on PBT evaluation of petroleum substances CONCAWE developed QSAR estimates (BioHCwin) and reviewed existing data for individual hydrocarbons representative of the various ‘hydrocarbon blocks’ covering a range of petroleum substances. Using the Hydrocarbon Block method and data on biodegradation of representative hydrocarbons in the range C9 to C26, it is concluded that diesel / gas oil fractions do not meet the persistence criteria and can be regarded as being inherently biodegradable.
Concawe 2001: Environmental classification of petroleum substances - summary data and rational. Report No 01/54. Concawe Brussels.
Concawe 2012: An evaluation of the Persistence, Bioaccumulation and Toxicity of Petroleum Hydrocarbons (revised), May 2012
Biodegradation in water and sediment, simulation test:
Substance is a hydrocarbon UVCB. Standard tests for this endpoint are intended for single substances and are not appropriate for this complex substance. However, this endpoint is characterized using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK report attached in IUCLID section 13).
Biodegradation in soil:
Substance is a hydrocarbon UVCB. Standard tests for this endpoint are intended for single substances and are not appropriate for this complex substance. However, this endpoint is characterized using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK report attached in IUCLID section 13).
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