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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The results of the key study, which is appropriate for the assessment of ready biodegradability, show s that the substance is readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The result of the key study is supported by one other ready biodegradation study which shows that 63% of the test material was biodegraded within 28 days, based on DOC and maximum 66.4% based on CO2 evolution.

Four further ready biodegradation experiments confirm that the substance is well biodegradable under OECD 301 testing conditions: Within 28 days of incubation, total maximum 48% to 54% of the test substance were biologically degraded, depending on the test design and the sludge which was used to run the tests. One of the studies shows a biodegradation of 28%.

All findings are summarized below:

Table – Summary of Ready Biodegradation results

OECD301F

Simon (2014)


127 mg/L (test item)

67 mg/L (ThOD)

BOD (Sapromat)

Biodegradation based on ThOD (based on elementary analysis

Schmallenberg (Germany)


86,8% (one replicate)


62,8%

Average if 64,3% and 61,3%


348 mg/L (test item)

203 mg/L (ThOD)

BOD (Sapromat)

Biodegradation based on ThOD (based on elementary analysis

52,1% ± 4.2

Average of 47,3%, 53,7% and 55,2%

OECD 301B

Häner (2013)

128 mg/L (test item)

20 mg/L (TOC)

CO2evolution (IC measurement). Biodegradation evaluation based on TOC

Weidhölzli

(Zürich, Switzerland)

60%

Average of 66.4% and 53.1%


DOC (Day 28)

63.0%

OECD301F

Häner (2013)

175 mg/L (test item)

100 mg/L (COD)

BOD (OxiTop). Biodegradation evaluation based on COD (ThOD unknown)

Weidhölzli

(Zürich, Switzerland)

53,8%

Average of 51.7% and 55.8%

DOC (day 28)

49.0%

OECD301F

Fiebig (2014)

35 mg/L (test item)

50 mg O2/L (oxygen demand)

BOD (OxiTop).

Biodegradation based on ThODNH3

Hildesheim

(Germany)

47,5%

Average of 39%and 56%

OECD 301B

Fiebig (2014)

20 mg/L (test item)

8,38 mg C/L

CO2evolution (titration). Biodegradation evaluation based on ThCO2

Hildesheim

(Germany)

27,5%

Average of 26% and 29%


Pass level for surfactants: 60%. The 10 -day window should not be applied in this case, as the test material is a mixture of structurally similar chemicals, and not a monoconstituent substance.